The Compact Muon Solenoid Experiment

CERN,CH–1211, GENEVA 23, Switzerland

Date of publication: 06-09-96 Number 96-01 CMS internal information servers: http://cmsdoc.cern.ch/cms.html and ftp://cmsdoc.cern.ch Aachen in the Limelight

A prototype of the muon chambers for the CMS experiment, built at the RWTH Aachen, placed in the H2 muon test beam at CERN last July.

For many of us our journey with CMS started in The prototype has dimensions of 3x1 m2 and is the earnest in Aachen. The event signalling the start was barrel muon drift chamber consisting of 12 layers of the ECFA sponsored "Large Hadron Collider drift cells. For the Barrel Muon Detector groups Workshop" during 4-9 October 1990. The workshop from Aachen, Bologna, Madrid and Padova have was highly successful and led to the adoption of the already tested several drift chamber prototypes of LHC as the next accelerator for CERN. Then the different sizes and arrangements in muon and chairman of ECFA was Jean-Eudes Augustin and hadron beams at CERN. Although extensive studies the chairman of the Organizing Committee was have been carried out up to now, an essential test is Günther Flügge both of whom are in CMS. We can still missing. At the LHC, the muon chambers will really say that "the LHC ball started rolling in be exposed to a sustained and high rate of particles Aachen". Almost six years later we are back in over their full area. Presently there is no such beam Aachen, this time for the CMS Week. Now we can at CERN. An installation consisting of a muon test say that CMS is changing gear as the first full-scale beam and a high activity radioactive gamma source, prototype, illustrated above, of a CMS detector has that simulates the conditions at the LHC, has recently been completed and transported to CERN recently been approved by CERN. This "Muon Test for beam tests. Here again Aachen takes the Facility" will be available in spring 1997 for testing limelight as this prototype has been constructed in prototypes of muon detectors. the workshops of RWTH Aachen.

EDITOR-IN-CHIEF OF THE CMS BULLETIN

I am happy to announce that Felicitas Pauss has accepted to be the Editor-in-Chief of the CMS Bulletin. She has been one of the strongest proponents of such a bulletin. Michel Della Negra

Competition

What should be the CMS logo?

You will have seen the cover page of this bulletin - you should now look again and decide if you would like to keep this “CMS-cube-logo” or propose something better. Remember, this logo will stay with us for many years and will also be used for other purposes! You are therefore invited to participate in a “logo-competition”. Please send your proposal to the Editor-in-Chief of the Bulletin (Felicitas Pauss) before the 15th of November 1996. During the CMS week in December the Collaboration Board will choose the logo by voting. The person proposing the selected logo will receive a special award to be announced in the next bulletin. EDITORIAL

Why should there be a Bulletin?

In spite of the vast amount of information dispersed in various media, like for instance on the Web, it is important to periodically summarize the key facts and orientations of the scientific life of CMS. The most direct and practical way is a CMS Bulletin which will be available and distributed in printed form, as well as accessible on the Web. This general idea received strong support during the last CMS week, where it was proposed that the CMS Bulletin be issued after each CMS Collaboration week, i.e. four times a year. What should be the content of the Bulletin?

- The Bulletin should contain a summary of the preceding CMS collaboration week, including concise status reports on different subdetectors. - Orientations which will condition the scientific future of CMS are mapped out in various bodies. There is also a quasi-permanent dialogue with the LHCC and related committees. These are usually presented orally to the Collaboration. The Bulletin will be the right platform where additional comments and explanations from the management can be added. - The Bulletin will also be an appropriate place for essays covering any specially interesting subjects. Suggestions and comments are very welcome! - CMS internal or external publications are numerous and cover a large spectrum of topics. A list of these publications ordered according to their classification will be provided together with the information on how to access them on the Web. - CMS life is rich in events and meetings, requiring therefore a good planing. The Bulletin will update agenda, underline the most important issues and can announce meetings well in advance. - CMS is a complex organization and the existing structure is not always sufficient to allow easy access to information necessary to find one’s way around, specially for newcomers and colleagues who make only infrequent visits to CERN. The information provided in the Bulletin should help improve this situation. How is all this organized?

Motivated by the strong encouragement from the Collaboration Board, a first version has been prepared to be distributed during the CMS Aachen week. In order to improve on this first bulletin feedback from the Collaboration is essential. The next step will be to establish an editorial board. Everybody is invited to propose names to the Spokesperson. The Spokesperson and the Editor-in-Chief will select the members of the editorial board. This board will edit the bulletin, consider new suggestions and can also invite special contributions.

Felicitas Pauss Editor-in-Chief

3

CMS Bulletin 96-01

Table of Contents

Editorial ...... 3 Letter from the Spokesperson ...... 5 A message from the Chairperson of the Collaboration Board...... 7 Summary of the CMS Week, 3–7 June 1996...... 8 CMS News ...... 8 Technical Status Report on the CMS Detector...... 9 Magnet/Installation ...... 10 Tracking...... 10 ECAL...... 11 HCAL...... 11 Muons ...... 12 Trigger and DAQ ...... 13 Software/Computing ...... 15 Physics ...... 15 CMS Documentation...... 16 The Constitution ...... 16 Technical Notes ...... 16 Picture Library...... 16 Access to the Minutes of CMS Federal Boards ...... 16 Job Opportunities...... 16 Composition of Boards ...... 16 CMS Collaboration Board...... 16 CMS Management Board...... 17 CMS Finance Board ...... 18 CMS Technical Board ...... 18 Aachen CMS Week , 9-13 September 1996 ...... 19 Aachen RWTH...... 19 More about Aachen ...... 20 Social Events during the CMS Week at Aachen ...... 21 Restaurants Guide...... 22 The Physicists' Building...... 23 CMS Calendar ...... 24 CMS General Information ...... 25 Secretariat ...... 25 Useful Phone Numbers ...... 25 Procedure for Newcomers ...... 25

4 CMS Bulletin 96-01

LETTER FROM THE SPOKESPERSON

LETTER FROM THE SPOKESPERSON

On 31st January this year ATLAS and CMS received connection to what may be a new theory of a memorandum from the Director-General fundamental physics: String Theory. According to C.H. Llewellyn Smith announcing general approval David Gross and Edward Witten ("The frontier of of the ATLAS and CMS projects. This approval is knowledge" in the Wall Street Journal, 12 July 1996), the result of five years of dedicated R&D and design discovery of Supersymmetry and elucidation of work, started in 1990 at the Aachen LHC workshop. String Theory could be "as revolutionary as the The significance of this effort can be judged by a discovery of quantum mechanics and relativity." They quotation from the minutes of the LHCC conclude in support of particle physics and of LHC: (21 November 1995): "It's important that society keep its commitment to making these discoveries". "The LHCC confirms its view that the CMS detector is capable of precision tracking within a high field solenoid, Our commitment, as CMS physicists, is to make sure robust muon and hadronic energy measurements, as well that, if indeed Supersymmetry (SUSY) is the theory as offering a unique electromagnetic energy measurement beyond the Standard Model, we will be able to fully using a crystal calorimeter, which are well matched to the exploit the different SUSY signatures with the CMS physics of the LHC... detector at LHC. Discovery of light supersymmetric particles may well happen before LHC with LEPII or The achievements of the two Collaborations (CMS and the upgraded Tevatron. However the spectroscopy ATLAS) in the development of new bold detector of supersymmetric particles is so rich that LHC (and concepts, and in the sophisticated upgrade of existing probably NLC) will be necessary to unravel the full technologies, is impressive: due to the difficult LHC spectrum. For example if the gluino and squarks are environment, in many areas progress in performance heavy (1 TeV?) only LHC can find it. Signatures of parameters is necessary by orders of magnitude. Where gluino and squark production at LHC are very further development is needed, the progress is spectacular: large transverse missing energy encouraging... (missing Et), many high Pt jets, many leptons and copious b production. As pointed out in Snowmass The Committee considers that the two Collaborations this summer (See SUSY-LHC subgroup final report) deserve the admiration of the scientific community for the large heavy flavour content in gluino decays is a work done, and full encouragement and support to general feature of SUGRA and many other SUSY proceed in their challenging task." models, because stops and sbottoms are generally We are now entering the last phase before the the lightest squarks to which the gluino would construction, which we hope will start in 1998. preferentially decay. What are the consequences for During this phase the CMS detector layout will be the optimisation of the CMS detector? Where do we frozen and the Technical Design Reports (TDRs) will stand with the design of the baseline CMS detector? be submitted for each sub-detector. It will be also The two main flagships of CMS, which have led to necessary to re-evaluate the physics performance of the approval of CMS (see minutes of LHCC quoted CMS. above), are: i) a robust and precise muon system The motivation for the LHC is stronger than ever, based on a 4 Tesla long solenoid and ii) a unique with the primary goal of hunting for the Standard electromagnetic energy measurement using a crystal Model Higgs particle over an impressive mass range calorimeter (ECAL). from 85 GeV to 1000 GeV. What is new on the The muon system design is progressing well. It was theoretical side, compared to, say the vision we had recently reviewed by the LHCC referees. They gave at the beginning of SSC/LHC studies, is the it a very positive report. The most difficult part is increasing importance of Supersymmetry and its

5 CMS Bulletin 96-01 the forward region. The natural Pt cut-off due to all these dead spaces degrade the hadronic energy ranging out in the calorimeters is only ≈ 1 GeV in measurement and more dangerously introduce non- the forward region as opposed to ≈ 3 GeV in the Gaussian tails in the energy response. Dead regions barrel region. This means that the single rate in the should be kept to a minimum. Compromises will forward region is two to three orders of magnitude have to be found in the final integration that higher than in the barrel, dominated by real muons guarantee acceptable performance for missing Et from π/K decays associated to beam-beam measurements. collisions. The only way to cut down this rate in the Developments on detector elements of the tracking first level trigger is to measure Pt online and apply a system are now well advanced. Engineered modules high Pt cut. To achieve this difficult task Cathode of Silicon and MSGC detectors are due before the Strip Chambers must be complemented by pad end of 1996 (Milestones). Solutions for radiation detectors with r-φ segmentation such as RPCs. hard electronics including optical analog links are Design, funding and construction of the forward demonstrated (Milestone July 96). Radiation hard RPCs remains a very high priority for CMS. An pixel chips and detectors are being evaluated. important milestone for the muon system is the Considerable progress is now being made on the definition of the RPC parameters in December 96. design of sub-system prototypes. Partially equipped An important step for the ECAL team was to prototype wheels of Silicon and MSGC detectors achieve last year in the test beam an energy (barrel and forward) are under preparation resolution of 0.6% with a matrix of nine long crystals (Milestones June 97). What is behind is the full (22.5 cm) read by APDs and exposed to a 100 GeV engineered solution of the overall system. The electron beam. A lot of challenges had to be faced: tracker geometrical layout has evolved a lot since growth of long crystals (26 radiation lengths), the Technical Proposal. It is now time to converge to suppression of the slow component without losing a baseline design, which should satisfy two simple light, tuning of the APDs to reduce the noise and but conflicting criteria: i) have enough hits per (high their sensitivity to charged particles leaking Pt) track such that the efficiency to reconstruct high through. One of the remaining challenges is the Pt (Pt > 2 GeV) tracks within jets (Et > 100 GeV) at sensitivity to low dose irradiation of the crystals. high luminosity (1034) is good (> 90%) over the full More R&D work is needed on the crystal growing rapidity acceptance (|η| < 2.5) and ii) stay within process until the resulting light losses are reduced to the tracker cost ceiling of 90 MCHF. Other an acceptable level. Only then will we consider the performance parameters come (almost) next stage of the preproduction of few 1000 crystals. automatically, like the momentum resolution (BL2 In parallel the milestone work on a 50 crystal matrix and point resolution are fixed), like the impact is proceeding. The goal is to demonstrate good parameter resolution (position of the first pixel layer energy resolution over a reasonably large area. is fixed). A full simulation and reconstruction program of the tracker is needed to evaluate the Priority in the design goals for the muon and ECAL reconstruction efficiency in LHC conditions. A systems does not mean that CMS is only a software tracking team has been formed. They must lepton/photon detector! In fact, as described in our deliver a simulation and reconstruction program to Technical Proposal, two other powerful sub- evaluate the new design before the end of 1996. detectors of CMS, i.e. the hadron calorimeter (HCAL) and the tracking/vertex detector, will be Building the CMS software is a very challenging installed inside the large radius superconducting task. On the one hand one has to deliver and coil. The HCAL is designed to measure hadronic jets maintain "official versions" of simulation and and missing Et. The tracking system, with its precise reconstruction programmes of the new baseline pixel and silicon layers close to the vertex, is CMS detector, using traditional software techniques. designed for efficient b-tagging. These two sub- On the other hand one has to develop new software detectors will be vital for the discovery of SUSY in techniques and prepare a Technical Proposal on CMS. Software and Computing for the LHC era. The CMS Software and Computing project is progressively The performance of HCAL on missing Et being organised as a sub-detector project with a measurements depends very much on two factors: Software and Computing Board (SCB) and a the coverage should extend up to rapidities of Technical Board (SCTB). |η| ≈ 5, the calorimeter should be hermetic and the energy resolution function should be Gaussian. It is The cocktail of first level triggers is well understood. the latter requirements which are difficult to meet. Algorithms of the calorimeter and muon trigger Space is needed between the HCAL barrel and end- systems have been simulated in detail. The caps for the passage of the cables and the cooling thresholds can be adjusted depending on the pipes of the inner detectors. This creates cracks or luminosity to maintain an overall rate below the regions with degraded energy resolution. Space is canonical limit of 20 kHz without losing efficiency needed for the photodetectors, the electronics and for the physics channels of interest at LHC. A the support structure behind the crystals. In general detailed list of milestones for the Trigger/DAQ 6 CMS Bulletin 96-01 system for 1996 and 1997 is described in the CMS now very close to final negotiations on the schedule book of milestones. Two particularly important of the overall LHC project. Despite depressing milestones are: i) The prototype of a readout chain rumours on budget cuts from the CERN member (July 97), which will be the basis for the next states I am convinced that a compromise will be generation of data acquisition systems for the test found that will maintain the LHC machine with full beam. ii) The high level trigger algorithm studies energy in one step on a reasonable timescale. One of including the use of the tracking information the best guarantees is the accepted view that LHC (December 96 and November 97). For B physics it will lead to fundamental discoveries. The second will be necessary to use pixel data for on-line important input is the enthusiasm of the LHC b-tagging in the 3rd level to limit the output rate to physics community and the recognized quality of storage. the design and R&D work over the last 5 years. We have essentially demonstrated that we can build The preparation of the Technical Design Reports still detectors able to fully exploit the LHC physics requires a large amount of work. We need a potential! Last but not least LHC is the first truly common effort on all fronts, specially also in global project in big science with world wide software oriented studies. I invite everybody to contributions from Europe, US, Japan, Russia, actively participate in this finalization of the CMS Canada, India, Israel, China... detector, which we will build and exploit together. CMS will be one of the most competitive high energy physics project for the next 20 years! We are Michel Della Negra

A MESSAGE FROM THE CHAIRPERSON OF THE COLLABORATION BOARD

Good communication is of the essence in giving a Collaboration is indebted to the Election Committee collaboration as large as ours a sense of community under its Chairman Thomas Muller for ensuring and a unity of purpose. I hope that the Bulletin will that, nevertheless, the operation proceeded play an important role in the crucial task of keeping smoothly. everyone up to date with the important issues and the latest developments in CMS. I close this short message by taking the timely opportunity, offered by the inauguration of our An item of CMS business that has occupied a Bulletin, to repeat to the full CMS community the e- significant amount of my time over recent months mail I sent to the Collaboration Board following my has been the preparation of the CMS Constitution. re-election in June, and to add my thanks to Siggi When I embarked on this task I did not fully Bethke for agreeing to continue as my Deputy. appreciate the importance of such a document to the practical operation of CMS. However, it quickly "I would like to thank the CMS Collaboration for giving became apparent from the high level of interest me such a clear indication of support in the election. I am shown in the early drafts, and from the careful very conscious that this places a heavy responsibility on thought that had gone into your comments that you me to continue to justify your confidence and I will work take this matter very seriously. I thank you for all hard not to disappoint you. your constructive suggestions, and I hope that this The next three years will present us with challenging new week in Aachen we will finally succeed in getting problems as the experiment moves into the construction our Constitution 'into the Statute Books'. phase. I welcome being given the opportunity to play a Although the complete document has yet to be full part in overcoming them. formally endorsed, in June we had a first CMS is a great collaboration and it is an honour and a opportunity to exercise some of its provisions by pleasure to serve as the Collaboration Board holding our first 'Federal' election under the new Chairperson". rules. Preparations for this election already revealed that some eventualities had not been foreseen in the original drafting of the procedure and the Bob Brown

7

CMS Bulletin 96-01 Summary of the CMS Week 3-7 June 1996

SUMMARY OF THE CMS WEEK FROM 3–7 JUNE 1996 - June 97: The LHC Project Review by the CERN CMS NEWS Council will occur in 1997. The earliest possible date is in June. It is expected that, if the Late news negotiations on the Non Member States - 30 August 96: At the LHCC meeting on the 29th of contributions are successful, the full energy August it was announced that the CERN DG (14 TeV) of the LHC could be reached in 2005 wishes to accelerate the LHC review process and rather than in 2008. that the CMS project report is now due at the end - October 97: Muon system TDR. After the Muon of the year and the Cost Estimate Version 8 on system review in May it was suggested by the 15th January 1997. More information will be given LHCC referees that the submission of the Muon in the opening session of the CMS Week in TDR could be brought forward by a few months. Aachen. - End 97: Submission of the remaining subdetector -Milestones: TDRs. Important milestones dates for the LHC project and LHCC: for CMS in 1996 and 1997 are: The last meeting with our LHCC referees was on 28- - 25 June 96: Meeting of the US/CERN negotiating 29 May, and was mainly dedicated to the review of team at CERN on the subject of the US the muon system. At the subsequent LHCC meeting contribution to LHC machine and experiments. on 30 May 96 the CMS referees presented their report on the CMS muon subsystem. Our referees - 24 October 96: Meeting of the Resource Review concluded: "The general impression is very positive. The Board (RRB), where the 1997 budget for CMS project is well under way and good progress is being should be approved. In the period 1996/1997, made towards full scale prototypes, planned for the end of according to the Interim Memorandum of this year." Understanding (IMoU), CMS can start to spend some project money for the preparatory work The request by CMS for a muon plus high intensity (Milestones) needed before the construction. The cobalt source test facility was recommended (and final version of the IMoU was discussed at the last later approved by the Research Board of 13 June). RRB Meeting in April. It has now been signed by about half of the CMS funding agencies. The next meeting with our LHCC referees will be on 27 August concentrating on the magnet, the new - 3 February 97: Release of an updated CMS Cost CMS layout and three important tracking Estimate (Version 8) subject to be reviewed by the milestones, including a decision on the technology Cost Review Committee (CORE). This early date is for the analog optical link. needed in view of the LHC project review foreseen in June 97. To meet this schedule a first Internal Review: version of the new CMS cost book has to be produced by the end of 1996, which in turn A team of CMS internal reviewers was formed implies that all subdetectors have to freeze a (3 per subdetector, the first one being the main baseline design as soon as possible in view of the reviewer): new cost evaluation, keeping in mind the overall - Tracking: D. Imrie (Brunel), P. Bloch (CERN), cost ceiling of 475 MCHF. H. Newman (Caltech) - 15 February 97: Magnet Technical Design Report - Muons: W. Van Doninck (Brussels), T. Müller (TDR). (Karlsruhe), A. Skuja (Wisconsin) - 1 June 97: Hadron Calorimeter (HCAL) TDR. It - Electromagnetic Calorimeter: A. Benvenuti was suggested that we submit the HCAL TDR at (Bologna), J. Freeman (FNAL), G. Zumerle (Padova) the beginning of June, before the LHC Project Review. - Hadronic Calorimeter: D. Denegri (Saclay), V. Obraztsov (IHEP), C. Seez (IC London) - 15 June 97: CMS project report. This document should be prepared in advance to all TDRs (except During three days, 24-26 April, the Management magnet and HCAL) and should contain a correct Board (MB) met with the reviewers and discussed assessment of the cost, resources and construction the four subdetectors. The last day was devoted to planning in view of the LHC Project Review. oral reports by the main reviewers. Written reports 8 CMS Bulletin 96-01 have been prepared, and have been distributed to was held in a special CB Meeting during this CMS the MB members and the subdetector project week. R.M. Brown (RAL) was unanimously re- managers. elected for another term of 3 years. After the election R. M. Brown nominated S. Bethke (Aachen) as The Trigger/DAQ subsystem will be reviewed at Deputy Chairperson. The CB endorsed his the next internal review foreseen during 6-8 nomination and S. Bethke accepted the office. November. Internal reviewers have been selected: L. Ristori (Pisa), F. Meijers (CERN) and F. Perriollat At the CB meeting 4 new groups were welcomed to (CERN). join CMS. They are: Ankara University (Turkey), Adana University (Turkey), Bhabha Atomic News from the Finance and Management Boards: Research Center (BARC) Bombay (India) and Peking Statements made by the CMS funding agencies at University (China). the last RRB indicate that the expected resources for A new draft version of the CMS Constitution is CMS are in the range 450-465 MCHF, depending on available and includes most of the comments the exact US contribution which is still under received. The deadline for further comments is discussion. For some of the funding agencies there 26 August. It is expected that the final approval of are hopes to get more money if the funding period is the document will occur during the next CMS week extended up to 2005. New collaborators under in September in Aachen. discussion should also bring more money. There is therefore no compelling reason to modify our target CMS plenary week in September 1997: Three cost of 475 MCHF for the high luminosity detector. institutes volunteered to host the CMS week in This matter was fully discussed in the Finance Board September 1997: Athens, Dubna and Madison. After (FB) and the Management Board (MB). a close vote, the CB decided that the CMS week will be held in Madison on 15-19 September 1997. Consensus was reached on the following: Submitted by M. Della Negra - The total cost of the CMS Experiment should remain at 475 MCHF. - The subdetector groups should prepare a new cost TECHNICAL STATUS REPORT ON THE estimate of their system, not exceeding the CMS DETECTOR subdetector total cost as shown in the CMS Cost Estimate - Version 7. Sub-detector prototyping is being pursued J. E. Augustin (IPN, Lyon) was welcomed in the FB vigorously. The main points are as follows: as Resource Manager of Tracking. - Magnet The following was discussed in the MB. The number of possible methods of fabrication of the conductor has been reduced to two: the The term of office for the "Regional Representatives" Rutherford cable, the pure Al insert and the Al alloy of "Other CERN Member States" and "Other - CERN reinforcement are all soft soldered or the cable and Non Member States" is limited to two years. For the insert are extruded followed by soft soldering of these two Management Board positions a rotation is the reinforcement. R&D on these two approaches is mandatory. The persons currently holding these continuing. The coil could now be wound in one positions shall organize the selection of their piece at Point 5. New FEA calculations show that the successor, together with the Spokesperson. The term outer radius of the coil/cryostat has to be increased of office for the "Other CERN Member States" by 15 cm to allow for higher rigidity and tolerances. representative ends middle of 1997, the term of office for the "Other - CERN Non Member States" Significant amount of work has been carried out, representative ends at the end of 1997. and is continuing, in order to finalise the detector configuration. Being better defined are the sub- It is suggested that the positions of the other detector dimensional envelopes, the tail catcher, the "Regional Representatives" be reconsidered on a beam pipe for low luminosity running, the space regular basis of two years by the respective required for cables, the overlaps between barrel and "Regions". The members of the "Regions" shall endcap calorimeters etc. Some of these points are define the selection procedure themselves. In addressed below. particular, they are free to reelect their Representative. - Inner Tracking The optimisation (performance/cost) of the inner News from the Collaboration Board: tracking is in progress. The possibility of According to our election procedure the term of introducing a 4th Si layer in the barrel region is office for the Chairperson of the Collaboration Board being investigated in this context. Progress towards (CB) is 3 years and the next term starts 1 January 97. milestones comprises pixel test structures, prototype The election of the Chairperson for the next term of mechanical structure in Al for Si barrel detectors, 9 CMS Bulletin 96-01 studies of cooling for the forward Si detector and the reinforcement to the pure aluminium insert have engineering drawings for the barrel "rod" design. been actively pursued. Intensive Finite Element The choice of open v/s closed box design for the computations, carried out collectively at INFN- forward MSGC "banana" will be recommended by Genova and Saclay, have shown that the box an ad hoc committee at the end of June. This concept for the conductor is not essential and that committee was set up by the Tracker TB. the shear stress distribution between all components, including the stresses induced by - Muon System cooling down are less than 20 MPa. Under these A full size MB1 drift chamber prototype has been conditions soft soldering is an attractive solution for constructed at Aachen and is ready for shipment to putting together the building blocks of the CERN. Another prototype is under construction at conductor. Other means, e.g. electron beam welding, Padova. The P0 CSC prototype with a new strip are also considered and industry at large has been plane is almost ready for a beam test. A CSC P1A approached at the occasion of the market survey for full size prototype (LHCC milestone) is under the production of the conductor. Answers are construction in Dubna. Substantial work is going on expected by the end of September. for the prototyping and the understanding of the operation of RPCs. The working parameters have to These new methods allow the production of long be fixed by the end of this year. The design of the unit lengths, even up to the length of one complete alignment system is progressing well and a layer, with a minimum of junctions if the assembly prototype is being prepared. of the conductor is done on site. The design of the magnet is driven by the design of the conductor, - Calorimetry and the new methods of producing the conductor Eighteen new crystals have been received showing a described above allow a significant simplification of better performance as far as speed of scintillation the coil construction if the winding proper can be light and light yield are concerned. These are now done in the surface hall situated on top of the main being tested in a high energy electron test beam. access shaft at Point 5. The coil would thus be wound as one single object and reduce the need for Finalisation of the design of the HCAL is underway. expensive components like intersection flanges. A combined test of crystals and HCAL in magnetic field (EHS magnet in H2) is being prepared. An The new ideas for producing the coil on site require electromagnetic calorimeter section for HV (nine some modifications to the surface buildings which towers using quartz core/quartz cladding and are necessary to assemble CMS on the surface. A quartz/plastic fibres) is being prepared. Design temporary small building has been added to the work for the final HV will commence soon. main surface building to allow the final assembly of the conductor on site. The winding proper would be In summary the detector is progressing well and done in the main hall with the coil axis vertical. A according to the declared milestones. The final rotating table will allow the coil to be turned by 90°. design has to keep within the cost ceiling of It can then be presented at the correct height for 475 MCHF. entry into the central barrel ring. A detailed study of all operations to be carried out in the surface hall We have to start using professional project planning (with a precise planning) is under way. methods and tools. This should result in a correct assessment of the resources required and the Submitted by A. Hervé construction schedule for the June 1997 LHC Project Review. TRACKING Submitted by E. Radermacher During a CMS week, in addition to the general common CMS meetings, not much time is available MAGNET / INSTALLATION for discussions on sub-detectors (Si, MSGC, pixel, etc.). Therefore the tracker community decided to The design of the yoke is being finalised. Responses have only one general common meeting lasting a to the market survey for the production of the barrel full day. The meeting was successful and was yoke are being received. The endcap yoke design essentially a kind of Tracker Collaboration meeting has to cope with the extra cantilevered weight where the most important problems in the tracker arising from the recent choice of a large hadronic were discussed and an extensive review of the end-cap. Problems are particularly severe for the various sub-detectors was made. In particular cart supporting the RF1 absorber disk. detailed status reports of all the milestones were For the coil, the ideas for producing the reinforced given by the various Coordinators with special conductor have continued to evolve since the emphasis on those that will be reviewed in the next beginning of 1996. After abandoning the so called LHCC referees meeting at the end of August double extrusion methods, other means of attaching (namely the choice of the optical technology and the first prototypes of silicon barrel and forward 10 CMS Bulletin 96-01 structures). The decision of the technology for the and design guidelines that are: APD glued to the analogue optical link has to be taken in the Tracker crystal, monitoring fibre in front of the crystal, Institution Board Thursday 25 July during the next reflector coating alveolar, four baskets per Tracker Week. Therefore the status of this supermodule, attempt to share the loading on the forthcoming milestone was presented and HCAL. The crystals are arranged to point off Z = 0 extensively discussed by G. Hall. by 3°, both in η and φ. The ECAL barrel parameter Another very important point discussed during the drawing, showing the outer radial limit at meeting was the new tracker layout and its R=1930 cm, was discussed in a common optimisation. The need for a new layout of the HCAL/ECAL meeting. tracker comes as a direct consequence of the M. Lebeau also presented detailed studies on decision taken recently by the collaboration to cooling, readout and services ("mechatronics"), the separate the volumes of the MSGC and the Si- results of thermal FEA studies as well as FEA of a detectors. mechanical model of baskets and spines. Although the optimisation of the layout is still far A barrel/endcap layout was presented which tries from being completed, a possible new layout was to keep full ECAL coverage whilst allowing space presented by A. Caner. A detailed schedule of work for the services of the tracker. Detailed studies will was presented to further optimise the layout and to start soon. reach a conclusion before the end of the year. The ECAL Design Task Force combines people from The meeting continued in the afternoon with the Ec. Polytechnique, LLNL, Lyon, Rome INFN, RAL, first joint ECAL-Tracker meeting where several ETHZ, and CERN. common problems were raised. In particular the problem of the space needed to bring the cables and In her general survey, M. Diemoz reported on the other services to the tracker was extensively crystal production and delivery during these last six discussed. This joint meeting was useful and it was months. Improvements in light yield were presented decided to have joint ECAL-Tracker meetings together with the suppression of the slow regularly. component due to the improvement of the purity of the raw material. A remaining challenge is the During the week, several working meetings of the understanding of radiation hardness of crystals at steering committees, like for instance the Si-strip low doses: what is an acceptable saturation level and and MSGC Steering Committees, were organised can that be monitored at the required level? Test and chaired by the various Coordinators. These beam running is used to quantify this problem. New special meetings are essential to take decisions "production" crystal are foreseen for the summer needed to keep the milestones on schedule. runs. Results were also given on the ongoing R&D In addition, at the CMS Collaboration meeting, the programme for APDs undertaken by Hamamatsu new tracker layout was presented by A. Caner and a and EG&G. detailed status report on all the milestones of the General information on the organization of the tracker was presented by H. Breuker. Regional Centres and the breakdown of tasks was We can conclude that good progress has been made given together with a description of ACCOS: by the tracker community since the last CMS week Automatic Crystal Control System. This includes the in understanding the many problems that must be quality control. The parameters (dimensions/ faced and solved in order to cope with the hostile transmission/ decay time/ light yield + uniformity) LHC environment. that need to be measured and methods to be used are now under discussion and will be finalised by Submitted by R. Castaldi the end of 1996 and debugged during the beginning of 1997. ECAL Submitted by J.L. Faure

The ECAL design task force coordinated by M. Lebeau produced a scheme based on the HCAL following lines: The hadron calorimeter is the vital element in the - a U-shape spine beam (which should hold the determination of missing Et as a signature of SUSY. supermodule) as a unit for installation To perform this measurement the calorimeter must - a "basket" as the module to assemble crystals in be hermetic and its response should be Gaussian. Regional Centres and transportation to CERN. Non-Gaussian tails are introduced by energy loss - an alveolar structure containing 2 x 6 crystals as a (leakage, absorption) as well as non-uniform basket sub-assembly. response of the calorimeter (such as can be induced by e/h not equal to one). To ensure that the missing 11 CMS Bulletin 96-01

Et measurement is as good as possible requires not To understand the e/pi reponse of the combined only a well designed HCAL, but also that as many ECAL/HB/HF system, as well as further investigate sources of irregular energy loss as possible are the effect of magnetic field on the HCAL reponse in eliminated. the Barrel configuration, three periods of test beam The HCAL group has been interacting constantly were taken during the summer of 1996. Planning for with other subsystems to reduce gaps, cracks and this test beam activity was a major topic during the dead material in the entire CMS detector. June CMS meeting. Considerable test beam data was Consequently, many integration meetings with accumulated during the summer and is now under other subsystems are necessary and are held analysis. Preliminary results will be available during regularly during CMS weeks. The June CMS week the Aachen meeting. had at least three such design discussion meetings Progress in understanding the response of the CMS involving the incorporation of HCAL design detector for SUSY detection has also been requirements in the design of the considerable. Several studies have been carried out Tracker/ECAL/Muon subsystems. Many of these or are under investigation. requirements are understood, but not necessarily resolved in an optimized fashion. These meetings The requirements of the HCAL subsystem in the will obviously continue until the CMS design is area of calibration, scintillator response, optimized for SUSY physics photodetectors, slow controls, electronics, are also evolving and are under investigation. The During the CMS week the HCAL subsystem mechanical design of the HCAL barrel and endcap endorsed a central hadron calorimeter design with a are also well in hand. Studies of the effects of fifty degree gap between the barrel and the endcap radiation (neutron/photon) backgrounds are also calorimeters. The HCAL group also endorsed that improving. the gap size between HB/HF should not be larger than 10cm. Subsequently the Management Board To extend the hermeticity of the HCAL system to eta and the Technical Board agreed to try to maintain of five (required for a good missing Et the gap at (10 + 2) cm as a CMS design requirement. measurement), CMS has adopted a quartz fiber very forward hadron calorimeter (HV). The HV will be Other major integration issues involve the Muon located in a very high radiation and a very high rate and ECAL subsystems. As CMS is conceived, the environment. It has the unique feature of having CMS HCAL is somewhat thin, so there is most of its response to hadron jets confined to a very considerable energy leakage (up to 5%) out of the small region of the calorimeter. Its Et resolution is back of the main HB/HF calorimeter unit into the well matched to that of the central calorimeter. Two first layer of the muon subsystem. It has been agreed test beam periods this summer were spent in that the first layer of absorber material in the muon confirming the energy reponse of a test module to subsytem will be instrumented (HAC3) to measure electrons and hadrons (pi's and p's) as well as the energy leakage out of the central HCAL investigating an electromagnetic module with modules. Discussions between the muon/HCAL forward facing readout path for the fibers. The effect subsytems will continue to ensure a graceful of a polyethelene shield in front of the HV was also integration of the HAC3 compartment of the HCAL studied in the test beam. Much of the June CMS into the muon susystem region. week was spent in preparation for test beam as well The crystal electromagnetic calorimeter distorts the as discussing the engineering integration of HV with optimal hadron shower measurements in two ways. the rest of the CMS detector. Its readout introduces considerable dead material Submitted by A. Skuja between the crystals and the first active layer of the HCAL (near hadron shower maximum). The crystal MUONS calorimeter also introduces an energy dependent e/h response for the combined crystal/copper HCAL system. In the last six months, considerable Two large scientific communities share the engineering optimization has been carried out by responsibility for the Muon Detector: an European the ECAL engineering group to reduce the size of and a US community. Europeans are responsible for the gap between ECAL and HCAL, as well as to the Barrel part (BMU) and US for the End Caps distribute the ECAL associated services reasonably (EMU). The US community is also deeply involved uniformly throughout this gap. From the point of in the design of the Iron Yoke. The CMS Week is the view of the HCAL subsystem, considerable progress time when the two communities meet together. This has been made in the optimization of this region, but explains the unusually long time dedicated to the it is felt that more could (and should) be done to Institution Board meetings held on Tuesday make the overall reponse of the combined afternoon of the CMS Weeks. This meeting is calorimeter system optimal for SUSY physics. generally a common Technical and Institution Board meeting in which are discussed subjects of common interest and responsibility. 12 CMS Bulletin 96-01

Despite being the outermost sub-detector the Muon expected at high luminosity. At low luminosity, the System is constrained to fit between the magnet fine grain trigger information allows a trigger on vacuum tank and the inside of the cavern (its size is low energy electrons, which is useful for B-physics driven by cost). Full geometric acceptance has to be studies. A complete simulation of the calorimeter guaranteed leading to the spectacular shape of the trigger algorithms is now implemented in iron return yoke in the transverse projection. CMSIM 103. Subjects discussed during the IB in the last CMS In parallel, the hardware prototyping activities are Week were RPCs, the Iron Yoke and the Tail proceeding well. A set of trigger boards which Catcher, and how to optimize the detector extract the trigger primitives (Et sums and fine grain performance. Decisions on the thickness of the primitives), transmit the trigger data (1 Gbit/s) and plates of the first two layers of the return yoke and enable readout were developed by the Lisbon and the tail catcher in the central ring were to be taken in Ec. Polytechnique groups. These boards were tested the CMS Technical Board. in the H4 beam together with the FERMI prototypes (40 MHz/10 bits ADC, compressor, readout In the RPCs Session presentations were made by P. memory, L1 filter). The chain runs at 40 MHz in Iaselli, C. Williams and C. Wuest. Much progress pipeline mode and features the basic mode of has been made in the understanding of the working operation at LHC. Data were collected during the of RPCs and many achievements were outlined. Test June and August runs. A preliminary analysis of the beam confirmation of the good laboratory test June data shows very encouraging results. results is expected. The development of a 160 MHz backplane for the T. Rodrigo and G. Bencze showed that a good trigger crates is under way in Madison. This is a solution exists for connecting the individual wheel critical element of the CMS trigger design which systems together. This is a byproduct of the new should be validated this year. The VHDL model and design of the barrel yoke. There are still some the schematic capture are finished and the layout is concerns about how this would fit in with the new underway. A test setup is being prepared which design of the tracker. includes reduced versions of the receiver and electron trigger boards. The system will allow a The status of the software and the estimation of the complete test of the 160 MHz adder ASIC. The background in the Muon and Tracker systems were Bristol group has produced a conceptual design of presented by W. Ko and Y. Fysiak in a parallel the global calorimeter trigger system. Prototyping is Software session. underway. Interesting results are expected from the intense test Submitted by J. Varela beam activity of this year. A lot of data were collected on a BMU Chamber prototype (Padova, Muon Trigger Bologna) in the presence of magnetic field. The first - Status of hardware design and prototyping Drift tube chamber built in Madrid has also been exposed to beam. Madrid is one of the three planned i) RPC / Pattern Comparator Trigger (PACT) sites for factories of the Barrel Chambers, the others The specification for the Pattern Comparator (PAC) being Aachen and Legnaro. An EMU P0 prototype ASIC has been completed. The design of the chip is from the US with modified (narrower) strips is in progress. The PACT test bench is under ready for the July run. The construction of the first construction. All 4 boards (synchro, trigger, readout large EMU Chamber, P1, is well advanced. The first and control) have been produced in Bari, assembled BMU chamber with three meter long wires is being in Warsaw and are now being tested. All FPGA completed in Aachen and will be put in the beam chips are already programmed. VHDL description together with the above mentioned RPCs. of test bench is well advanced. The test bench is EMU and BMU meetings are planned end of June planned to be connected to RPC cosmic telescope and August in preparation of the next CMS Week to MINI in Bari, autumn this year. be held in Aachen. A full presentation of the MF1/1 ii) Drift Tubes / Bunch & Track Identifier (BTI), system is foreseen in the next BMU meeting. Track Correlator (TC), Trigger Server (TS) Submitted by F. Gasparini The tests of a FPGA prototype of BTI chip TRIGGER AND DAQ ("meantimer") with Drift Tubes in a muon beam were successful. Results are presented in CMS TN/96-002. The design of a FPGA prototype of the Calorimetry Trigger Trigger Server chip is well advanced (see CMS The algorithms of the CMS Calorimeter L1 Trigger TN/96-078). VERILOG simulation gives satisfactory are now close to their final specifications (see CMS- results. TN/96-10). An extensive simulation study using 'fastsim' as well as CMSIM data showed a very high trigger efficiency for the whole range of physics 13 CMS Bulletin 96-01 iii) Cathode Strip Chambers The two muon trigger rates were studied by The major question discussed recently was how to A. Fengler from Warsaw. He generated ~100 000 γ ψ solve multi-muon ambiguities in the chambers. A inclusive W, Z, , J/ , top and WW events as well as possible solution could be stereo strips, but such a 619 039 800 minimum bias events. We consider trigger is technically more difficult and more submitting this remarkable achievement to... the sensitive to neutron background. Most probably Guiness Book of Records! "classical" radial strips will be used and ambiguities Submitted by G. Wrochna will be left for the Track Finder to solve. Possibility of using RPC information is also being considered. DAQ The first design of the strip comparator ASIC is The meeting was divided into two halves: the being simulated. The chip is going to be submitted review of all CMS detector readout requirements for production soon. Limited versions of strip and and the presentation of results from the RD-31 event wire pattern chips should be implemented in FPGA builder and from an OO based event filter. before the end of this year. They will be tested with P0 CSC prototype. - Requirements review. Detector readout data format and volumes. iv) Track Finder All detectors were asked to present their Test bench design is well advanced. All XILINX requirements in terms of number of channels, chips are already programmed. They will be placed architecture, readout links and front-end drivers. An on boards by late summer. VERILOG and VHDL evaluation of the amount of raw and formatted data simulation has been successfully performed. was made. - Trigger simulation and software development Tracking dominates the data volume requiring i) RPC / PACT 1 MB/event followed by ECAL with 0.3 MB/event. The total volume is estimated to be 1.6 MB/event. The PACT simulation package MRPC has been implemented in CMSIM 100. Parametrisations are From this survey two main concerns arise: available. - More precise evaluation of the formatting ii) Drift Tubes / BTI, TC, TS algorithms and the expected data volumes BTI prototype test data were used for simulation of have to be made before a meaningful estimate the final chip. The trigger simulation software is of the performance and costs of the data going to be moved from CMSIM 008 to CMSIM 100 acquisition system can be made. soon. - Common design aspects of the FEDs have to be kept in mind by each sub-detector readout iii) Cathode Strip Chambers designer. This needs coordination. MF1/1 test data were used to simulate bunch Parameter and readout-DAQ interfaces have to be crossing identification (bx.id.) and algorithms to reviewed soon. achieve half-strip resolution. Stand alone programs were used to study bx.id., half-strip resolution, etc. - Experience with RD31 event builder demonstrator The trigger simulation software has been M. Costa described some of the developments in implemented in CMSIM 100. RD-31 and results on ATM based event builder demonstrators. Two switch fabrics (Alcatel and iv) Track Finder AT&T) have been integrated in a VME based event The Simulation software is going to be moved from builder. Different event assembly and data flow CMSIM 008 to CMSIM 100 soon. protocols have been tested and the performance measured. The ATM technologies and the adopted v) Backgrounds techniques seem very promising for application at Many people have put in a lot of effort to study the the LHC. More information is available from the various backgrounds. An LHC Background RD-31 status reports. Workshop was held on 22.03.96 at CERN. A copy of transparencies can be obtained from K. Potter - Towards a CMS Event Filter Farm Software (CERN). designed with OO Methods A. Kruse presented the result from prototypes for vi) General issues the CMS Event Filter Farm using OO methodology. The isolated muon trigger has been studied by Work on a model for the event filter farm has C. Albajar from Madrid. Preliminary results indicate started. First result will probably be presented that the trigger threshold for isolated muons can be during the September CMS week. lowered using the "quiet region" bit from the Submitted by S. Cittolin calorimeter trigger.

14 CMS Bulletin 96-01

1996. It will describe our computing model, the management of the software and of the project. This SOFTWARE / COMPUTING will be the reference document for software and computing. It will allow CMS to plan its computing Simulation infrastructure, and help formulate requests for The simulation of the present baseline layout funding. It is clear that the CTP document needs to requires more manpower, as already stated in the be updated almost every year, as the field changes previous CMS meetings. rapidly. To have a look following: For tracking studies, a task force has been created http://cmsdoc.cern.ch/ftp/CMG/CTP/index.html with several people contributing actively during the Submitted by M. Pimïa past few months. Very good results have been obtained: we have been able to finalise the semi- automatic 'easy way' of introducing new geometries PHYSICS into the simulation program by using the chain: → → excel tables ascii files geant3 subroutine calls. Daniel Denegri summarised the different Pattern recognition using an algorithm based on contributions from the physics simulation group Kalman Filter is now installed in the standard performed during the last months. simulation package but needs some tuning. Another method based on templates is working now in The efforts concentrate presently on sparticle predefined cones and will be made available soon. searches in order to understand the missing energy response of the detector. This is investigated using For calorimetry a similar task force would be very different event signatures from the clean (2 lepton + welcome to finalise the detector description and to missing ET) to the less clean (multi jet + missing ET). proceed with the fast simulation. All the HCAL These studies cover gluino and squark searches as manpower has been devoted to the study of the well as sleptons and direct neutralino / chargino many evolving geometry options; no code has been production. In order to facilitate the comparison of implemented in CMSIM10x for public use. A similar the discovery potential for the different channels all situation exists for ECAL. Remedying this situation studies are performed within the SUGRA Model for is of the highest priority. a limited set of parameters.

On the muon side, the trigger simulation code has Updates on Standard Model Higgs studies were progressed well. Also the geometry and the given including the effect of two-loop calculations magnetic field maps have been updated. Full CSC for the decay. First results for possible technicolor simulation and reconstruction have been π0 → signatures from the technipion T bb channel implemented. The amount of material in front of the were presented and results were shown for Z → + - muon chambers depends on the geometry of the µ µ production in heavy ions collisions. calorimeter and the infrastructure (cables etc.)! The worry is that without a tailcatcher there would not Plans for a Heavy Ions Workshop in Dubna were be enough lambdas for good muon ID. announced which should be a follow-up of the Lyon meeting in June 1996. The Dubna meeting has been The documentation about the simulation package is postponed to the first week of February 1997. available on the Web: http://cmsdoc.cern.ch/~sunanda/swsi_guide.html On the 30th October 1996 a plenary meeting will take place at CERN summarising the mini- Computing Technical Proposal workshop on sparticle searches in CMS and ATLAS. The important milestone for the software Submitted by Felicitas Pauss /computing project is the Computing Technical Proposal (CTP), required by the LHCC by the end

15

CMS Bulletin 96-01 CMS Documentation

Individual figures in these transparencies may be THE CONSTITUTION extracted for reuse if they were originally made in EPS format (as well as from most Technical Notes). The CMS Constitution will be discussed and ratified during the CMS week in Aachen. Copies will be available during the opening session. Comments can ACCESS TO THE MINUTES OF CMS be fed into the discussion through your FEDERAL BOARDS Collaboration Board representative. Copies of the minutes of the various Federal boards can be obtained as follows: TECHNICAL NOTES - Collaboration Board: available to all members of the Collaboration. The rules concerning the classification and Posted on the Web and distributed by e-mail. distribution of CMS documents will be finalised at the Aachen meeting. People are invited to read and - Management Board: comment on these rules. It is planned that the next upon request from your CB representative. issue will contain a list of new refereed notes. The - Technical Board / Finance Board: list of previous notes is available on the Web (http://cmsdoc.cern.ch/technotes.html). upon request from the Chairperson of the TB/FB.

JOB OPPORTUNITIES PICTURE LIBRARY A list of vacancies in CMS institutes is posted on the Most of the reference transparencies made at CERN Web (http://cmsdoc.cern.ch/jobs/news.html). (e.g. LHCCtalk Jan. 95, RRBtalk Apr. 96) are available on the www/ftp server in fast display format (.gif) and PostScript files (also soon PDF). Composition of Board

CMS COLLABORATION BOARD

Collaboration Board Chairperson: R. Brown Collaboration Board Deputy Chairperson: S. Bethke Members of the CMS Management Board (ex-officio).

Armenia Croatia Yerevan G.L. Bayatian Split-Univ J. Tudoric-Ghemo Austria Czech & Slovak Republics HEPHY-Vienna C.E. Wulz Prague-Charles M. Finger Belarus Estonia Minsk-NSEC N.M. Shumeiko Tallinn E. Lippmaa Belgium Finland Brussels-ULB C. Vander Velde Espoo P.A. Aarnio Brussels-VUB W. Van Doninck Helsinki J. Tuominiemi Mons Ph. Herquet Oulu T. Tuuva Bulgaria France Sofia-INRNE V. Genchev LAPP-Annecy J.P. Peigneux Sofia-UNIV L. Litov Lyon G. Smadja China, PR Ec. Polytechnique J. Badier Beijing-IHEP W.G. Li Saclay J.L. Faure Beijing-Univ Y. Ye Strasbourg W. Geist Hefei Z. Bian Georgia Cyprus Tbilisi-HEP N. Amaglobeli Nicosia-Univ P.A. Razis Tbilisi-IPAS V. Roinishvili

16 CMS Bulletin 96-01

Germany Switzerland Aachen-1 D. Pandoulas CERN M. Della Negra Aachen-3A S. Bethke PSI-Villigen H.Ch. Walter Aachen-3B G. Flügge Zurich-ETH H. Hofer Karlsruhe-Univ Th. Müller Zurich-UNIV C. Amsler Greece Turkey Demokritos-Athens A. Vayaki Adana-Cukurova G. Önengüt Ioannina F.A. Triantis Ankara-METU P. Tolun Hungary Ukraine Budapest G. Vesztergombi Kharkov-KIPT P.V. Sorokin India United Kingdom Chandigarh J.M. Kohli Bristol G.P. Heath New Delhi R.K. Shivpuri Brunel D. Imrie TIFR-EHEP-Bombay S.N. Ganguli London-IC G. Hall TIFR-HECR-Bombay V. S. Narasimham Rutherford R.M. Brown Italy USA Bari S. Nuzzo Boston-Univ L. Sulak Bologna A. Rossi Caltech H. Newman Catania R. Potenza Carnegie Th. Ferguson Firenze E. Focardi Fairfield D. Winn Genova P. Fabbricatore Fermilab D. Green Padova G. Zumerle Florida-HEPG V. Hagopian Pavia S.P. Ratti Florida-UNIV G. Mitselmakher Perugia G. Mantovani Iowa Y. Onel Pisa R. Castaldi Johns-Hopkins C.Y. Chien Roma-1 M. Diemoz Livermore C.R. Wuest Latvia N.N. Los Alamos H.J. Ziock Pakistan Maryland A. Skuja Islamabad H. Hoorani Minnesota R. Rusack Poland Mississippi J. Reidy Warsaw-IEP J. Krolikowski MIT P. Sphicas Northeastern S. Reucroft Portugal Notre Dame R. Ruchti LIP-Lisbon J. Varela Ohio T.Y. Ling Russia Princeton P. Piroué Dubna I. Golutvin Purdue-G V.E. Barnes Lebedev-Moscow S.V. Rusakov Rice D.L. Adams INR-Moscow V. Matveev Riverside B.C. Shen ITEP-Moscow V. Kaftanov Stony Brook M. Mohammadi Baarmand MSU-Moscow L.I. Sarycheva Texas-Univ-Dallas E.J. Fenyves Novosibirsk A. Bondar UCD W. Ko Protvino N. Tyurin UCLA J. Hauser St-Petersburg A. Vorobyov UCSD J. Branson Spain Wisconsin W. Smith Madrid-CIEMAT M. Aguilar-Benitez Uzbekistan Santander T. Rodrigo Anoro Tashkent B. Yuldashev

CMS MANAGEMENT BOARD

Spokesperson M. Della Negra - Hadron Calorimeter D. Green Deputy Spokesperson T. Virdee - Barrel: D. Green Physics Coordinator D. Denegri - Endcap I. Golutvin Resource Manager D. Blechschmidt - Muon Detector F. Gasparini Technical Coordinator E. Radermacher - Barrel F. Gasparini - Endcap G. Mitselmakher Subdetector / Subsystem Project Managers: - Trigger / DAQ S. Cittolin - Magnet A. Hervé - DAQ S. Cittolin - Central Tracker R. Castaldi - Trigger W. Smith - Electromagnetic Calorimeter H. Hofer - J.L. Faure - Software / Computing M. Pimiä 17 CMS Bulletin 96-01

Coordinators: Regional Representatives: - Budget H. Rykaczewski - CERN M. Della Negra - Electronics G. Hall - France J. Badier - Experimental Area T. Wikberg - Germany S. Bethke - Heavy Ions M. Bedjidian - Italy R. Castaldi - Infrastructure et Integration A. Hervé - Russia & Dubna Member States V. Matveev - Physics Tools F. Pauss - Switzerland L. Tauscher - Planning T. Meyer - United Kingdom R. Brown - USA D. Reeder - Other CERN Member States W. Van Doninck - Other Non-CERN Member States S. Ganguli

CMS FINANCE BOARD

Resource Manager D. Blechschmidt - Switzerland H. Hofer (ETH) - H.C. Walter (PSI) Budget Coordinator H. Rykaczewski - Turkey M. Zeyrek - United Kingdom R. Brown Linkpersons to CMS Funding Agencies: - USA D. Green (DoE) - S. Reucroft (NSF) - Austria C. Wulz - Belgium W. Van Doninck Subdetector/Project Resource Managers: - CERN D. Blechschmidt - Tracking J.E. Augustin - China W. Li - ECAL B. Borgia - Croatia J. Tudoric-Ghemo - HCAL J. Hanlon - Cyprus P. Razis - Muons C.E. Wulz - Estonia N.N. - Trigger/DAQ J. Varela - Finland J. Tuominiemi - France J. Badier (IN2P3) - J.L. Faure (CEA) Project Managers for Common Projects: - Germany S. Bethke - Magnet A. Hervé - Greece I. Siotis - Software / Computing M. Pimiä - Hungary G. Vesztergombi Project Manager for - India S. Ganguli Infrastructure and Integration A. Hervé - Italy R. Castaldi - G. Zumerle - Latvia N.N. Ex-officio: - Pakistan H. Hoorani Spokesperson and / or his / her Deputy - Poland J. Krolikowski M. Della Negra / T. Virdee - Portugal J. Varela Technical Coordinator E. Radermacher - Russia/Dubna Member States V Matveev - I Golutvin Planning Coordinator T. Meyer - Spain M. Aguilar-Benitez

CMS TECHNICAL BOARD

Technical Coordinator E. Radermacher Chairpersons of Working Groups (ex-officio): Planning Coordinator T. Meyer - Cable and Connectors H. Rykaczewski - Cost Review H. Rykaczewski Technical and other Coordinators: - Detector Interface G. Faber - Magnet A. Hervé - Safety E. Radermacher - Tracking N.N. - Detector Control F. Perriollat - ECAL P. Lecoq - Alignment G. Bencze - HCAL J. Freeman - V. Kryshkin - N. Akchurin - Radiation M. Huhtinen - Muons H. Reithler - R. Loveless - Trigger / DAQ F. Szoncsó Observers (ex-officio): - Electronics Coordination G. Hall - Test Beam G. Bencze - M. Haguenauer - Software Coordination M. Pimiä - Luminosity G. Snow - Experimental Area T. Wikberg - Safety H. Schönbacher - Infrastructure and Integration A. Hervé - Physics Coordination D. Denegri Ex-officio: Spokesperson and / or his / her Deputy (ex-officio) M. Della Negra /T. Virdee Resource Manager D. Blechschmidt Budget Coordinator H. Rykaczewski

18

CMS Bulletin 96-01 Aachen CMS Week 9-13 September 1996

AACHEN CMS WEEK FROM 9-13 SEPTEMBER 1996 RHEINISCH - WESTFÄLISCHE TECHNISCHE HOCHSCHULE

AACHEN RWTH The RWTH is an application-orientated place of training: The RWTH is an interdisciplinary research centre. - 37,000 students, 4,000 of whom are from nations It has an annual budget of DM 890 M of which other than Germany. DM 160 M is from external funding (approx. 1/3 - 9 faculties, 65 courses of study, 1 graduate college, comes from industry) 260 chairs and institutes, studies for mature students. 30 clinics, 7 central establishments 720 professors, - 4,000 graduates every year. lecturers and teaching staff for particular assignments, 170 teaching and research areas, 7 - 9,000 members of staff, 1,800 persons undergoing special research areas and numerous research practical training and trainees, thereby RWTH is networks. the largest employer in the region.

19 CMS Bulletin 96-01

The RWTH is an international List of Hotels innovation centre:

Steigenberger Quellenhof Hotel Brülls am Dom Hotel Weiss - Cooperation agreements with the Monheimsallee 52 Hühnermarkt Adalbertsteinweg 67 Chamber of Industry and Commerce tel.: 15 20 81 tel.: 3 17 04 tel.: 50 50 07 Novotel Aachen Hotel Reichshof Hotel Eupener Hof in Aachen as well as the Chamber of Europaplatz Seilgraben 2 Krugenofen 63 Handicrafts in Aachen. tel.: 16 87-0 tel.: 2 38 68-69 tel.: 6 20 35 Aquisgrana City Hotel Hotel Dreiländereck Hotel Rütten - Cooperation with the Aachen Society Büchel 32 / Buchkremerstr. Dreiländerweg 105 Krefelder Strasse 86 tel.: 4 43-0 tel.:8 83 33-0 tel.: 15 73 45/15 40 81 for Innovation and Technology Best Western Hotel Hotel Zur Abtei Hotel Relais Königsberg Transfer (AGIT) and companies Regence Napoleonsberg 132 Schleidener Strasse 440 Peterstrasse tel.: 0 24 08/21 48 tel.: 0 24 08/50 45 concerned with promoting the tel.:4 78 70 Hotel Granus Etap Hotel economy in the bordering area. Pannonia-Hotel Aachen Passstrasse 2a Stangenhäuschen Jülicher Strasse10-12 tel.: 15 20 71-72 tel.: 91 19 29 - 13 allied research institutes, which tel.: 51 06-0 Hotel Baccara Hotel Marx Holiday Inn Garden Court Turmstrasse 174 Hubertusstr. 33-35 focus on areas ranging from Krefelder Strasse 221 tel.: 8 30 05 tel.: 3 75 41/42/43 biomedical technology to water- tel.: 18 03-0 Hotel Drei Könige Gästehaus Eich-Eck Hotel Burtscheider Markt Büchel 5 - Ecke Markt Eupener Strasse 133 technology. Burtscheider Markt 14-16 tel.: 4 83 93/94 tel.: 6 60 24 tel.: 60 00 00 Hotel Stadt Koblenz Hotel Neuenhof - 57 spin-off companies established in Hotel Ibis Aachen Leydelstrasse 2 Vaalser Strasse 387 the Aachen Technology Centre, 80% Friedlandstrasse 8 tel.: 2 22 41/42 tel.: 87 04 48 + 87 43 27 tel.: 47 88-0 Hotel Krone Hotel Braun of which originate from the Hotel Benelux Jülicher Strasse 91a Lütticher Strasse 517 University with the creation of over Franzstrasse 21-23 tel.: 15 30 51 tel.: 7 45 35 tel.: 2 23 43-44 Hotel "Schweizer Hof" Hotel Cortis 2.000 new jobs (since 1984). Kurhotel Schlosspark Werkstrasse 16 Krefelder Strasse 52 Rahe tel.: 0 24 08/94 53-0 tel.: 15 60 11/12 Adele-Weidtm.-Str. 87-93 - 200 seminars and colloquia held Hotel Danmark Hotel Forsthaus Schönthal tel.: 1 74 00 Lagerhausstrasse 21 Graf-Schwerin-Str. 41 annally on vocational further Schloss Hotel Friesenrath tel.: 3 44 14 tel.: 6 83 05 Pannekoogweg 46 training. Hotel Am Kapellchen Hotel Dura tel.: 0 24 08/50 48 Breiniger Strasse 1 Lagerhausstr. 5 Hotel Central - Regional industrial clubs. tel.: 0 24 08/20 18-19 tel.: 40 31 35 Römerstrasse 5-9 Hotel Haus Richterich Hotel Haus Press tel.: 2 68 73/74/75 - 40 cooperation treaties with R&D- Roermonder Strasse 573 Trierer Strasse 842-844 Hotel Krott tel.: 1 36 93 tel.: 52 10 01 establishments around the world. Wirichsbongardstr. 16 Hotel Brunnenhof Hotel Zur Heide tel.: 4 83 73 Schleidener Strasse 132 Raafstrasse 76-80 Hotel Royal tel.: 0 24 08/8 00 24 tel.: 0 24 08/20 85/86 Jülicher Strasse 1 Hotel Buschhausen Hotel Göbel tel.: 1 50 61 Adenauerallee 215 Trierer Strasse 546 Hotel Ibis Normaluhr tel.: 6 00 80 tel.: 52 32 44 Zollernstrasse 2 Hotel Berliner Hof Hotel Hansa-Haus tel.: 51 84-0 Bahnhofstrasse 3 Von-Coels-Strasse 42 Hotel Lousberg tel.: 2 08 75 + 4 97 72 tel.: 55 13 80 Saarstrasse 108 Hotel Brabant tel.: 2 03 31-2 Stolberger Strasse 42 Hotel Am Marschiertor tel.: 50 00 25/26 Wallstrasse 1-7 tel.: 3 19 41/42/43

thinking and lifestyle has a long tradition. Aachen is Faculties of the RWTH Aachen also conveniently located with regard to road traffic, Faculty 1: Faculty of Mathematics and Sciences on the European motorway axes to Brussels, Paris Faculty 2: Faculty of Architecture and Antwerp. It is also easy to reach by rail. The Faculty 3: Faculty of Civil Engineering and airports of Düsseldorf, Cologne, Maastricht and Surveying Brussels are only a stone's throw away. And Aachen Faculty 4: Faculty of Mechanical Engineering is surrounded by delightful countryside, at the foot Faculty 5: Faculty of Minnig Engineering, of the densely wooded Eifel, not far from the Belgian Metallurgy and Geoscience Ardennes hills and the green pastures of the region Faculty 6: Faculty of Electrical Engineering of Limburg in the Netherlands. Faculty 7: Faculty of Philosophy Aachen is a hospitable town: even the Romans felt at Faculty 8: Faculty of Economics home here. Situated in the midst of green areas, a Faculty 10: Faculty of Medicine city, and yet easily accessible. Aachen is pedestrian- friendly: you can comfortably explore the town on MORE ABOUT AACHEN foot. Whether you come on a shopping trip, on a health cure or for a conference, in Aachen you are greeted with sparkling variety, full of joie de vivre Aachen is in a fortunate situation in more ways than and vitality. Try it out for yourself. Aachen looks one: here where the three countries of Germany, forward to your visit! Belgium and the Netherlands meet, European

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Aachen has stayed young for almost 2000 years: an

RWTH exciting, pulsating and constantly fascinating Main Buiding town! The Cathedral and the historic Town Hall are in the heart of the town. The Aacheners love reception this wonderful ensemble around which the lively hurlyburly of town life centres. It is the mingling Templergraben which defines the flair and the charm of this town. Here romantic corners, there ultramodern

FO 5 architecture, green oases and bustling spaces, Lecture hall tranquility, innovation and dynamism. In the pedestrian-friendly centre you will come across all kinds of delights: impressive town houses and historic squares, the sparkling variety main entrance of the fountains of Aachen, "la dolce vita" in the registration cafes and the fantastic choice of first-rate shops - a Karman Forum pure paradise for shoppers! Even after the shops

Eilfschornsteinstrasse close there is still plenty going on. The Aacheners are a sociable crowd and the city centre is the place SFO 1,2... seminar rooms to meet. That is especially true for the Aachen students! On many evenings the venerable marketplace is still buzzing with people late into Karman-Forum, EilfschornsteinstraBe 15 the night.

SOCIAL EVENTS DURING THE CMS WEEK AT AACHEN

the Eifel forest towards Nideggen. There are many Monday, Sept. 9 (19:00): nice views of the castle and the city. Guided tour Welcome Reception through the Castle Museum. Drinks and snacks will be served in the Conference dinner (19:00) "Gewölbekeller" of the main building of the university, Templergraben 55. Entry is through a The conference dinner will take place in the Castle small door on the right side of the building, Restaurant. Everybody who has paid the 2 minutes walking distance from the conference site registration fee will receive a free dinner ticket at the (see maps attached). All participants and their conference registration desk. Additional tickets may families are welcome. be bought at the registration desk (80 DM per person). The ticket includes transportation by Tuesday, Sept 10 (19:00): excursion buses to Nideggen and back to Aachen plus dinner including a basic selection of drinks Reception by Dr. J. Linden, Mayor of Aachen (table wine; mineral water;...). Live classical music and welcome speech by Dr. J. Linden, Mayor of Aachen in the historic Friday, Sept. 13 (14:00): coronation chamber of the 650 year-old "Rathaus" Visit to the Aachen institutes and workshops (city hall), in the centre of the city (5 minutes walking distance from the conference site). Guided Guided tour through our institutes and workshops, tour through the Rathaus afterwards. All situated at the western border of Aachen, about 4 participants and their families are welcome. kms from the centre of the city. Transportation by local buses. Everybody is welcome to attend -- but Thursday, Sept 12: please sign the list of interested people at the registration desk, at the latest by Wednesday Excursion (afternoon) evening. In order to leave some private time to explore the city of Aachen (Cathedral; museums, shopping; all Spouses Programme within 5-15 minutes walking distance from If there is sufficient interest, additional sightseeing conference site) the excursion will start at 4:00 p.m. tours or other events may be organised, on a private Buses will leave from the conference site and head basis, by the spouses of some of the local physicists. towards the medieval city of Nideggen which is Whoever is interested should let the organisers about a 75 minutes drive from Aachen. If the know in advance (e.g. by email to weather permits, those who are interested may jump [email protected]), at the latest out of the bus and go for a 60 minutes walk through when registering on Monday.

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RESTAURANTS GUIDE

There are hundreds of Restaurants, Cafés and Pubs "Rathaus", 5 mins walking distance. Oldest in the centre of Aachen. The following list gives just restaurant of Aachen. Local cuisine; historic a few suggestions, checked out by local physicists. ambiance. Courageous tourists try the "Puttes". Walking distances are w.r.t. the Conference site Medium priced. - Don't miss this one - (Karman Forum). - ZUM GOLDENEN APFELBAUM, Krämerstr. 7, 5 mins walking distance. Historic German I. In the vicinity of Karman Forum (up to 5 restaurant with atmosphere. Expensive. minutes walking distance): - ALT AACHENER KAFFEESTUBEN (Van den There are many small Restaurants, Cafés and pubs Daele), corner of Büchel and Körnergasse; 10 mins in Templergraben and in Pontstraße, most of walking distance. Old-style Café and Printen reasonable quality and price. Those around the bakery. Belgian pastry. Also small dishes for Rathausplatz are more touristic with higher prices. lunch (sandwiches, toasts, salads, soups, The recommended ones are: quiches,...). Decent prices. - Don't miss this one, - Cafeteria inside the Forum: Sandwiches, sweet either. rolls, coffee and more. Inexpensive. - HONGKONG, Judengasse 10. 2 mins walking III. Specialities, Gourmet's choice: distance, just opposite the Forum, across (all worth the 15 mins walk from the Forum) Annuntiatenbach. Good and inexpensive Chinese - BANGKOK, Wirichbongardstr. 27, and cuisine. Lunch specials including appetizer and CHIANGMAI, Wirichbongardstr. 19-21. dessert for about 12 to 15 DM. Authentic Thai cuisine, owned by the same - PIZZERIA FRASCATI, Templergraben 1; family. Inexpensive. Lunch specials including PIZZERIA DA FRANCO, Templergraben 25. appetizer and dessert for 12-15 DM. Simple but good, decent prices. - CALYPSO, Wirichbongardstr. 5. Good Italian - STADTKRONE, Pontstr. 50. Jugoslavien cuisine, cuisine. Medium prices. most meals include fresh salad bar. Good quality - RISTORANTE DA SALVATORE, Bahnhofsplatz food, medium prices (typically 18 to 25 DM per 6, and RISTORANTE TOSCANA, Römerstr. 6, meal). both close to the train station. Very good Italian II. Historic and old-style Restaurants and Cafés: cuisine (for many, the best in town). Prices according to quality. - POSTWAGEN, Krämerstr. 2. Small, 3-story attachment on left side of the 650 years old

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CMS Bulletin 96-01 The Physicists’ Building

The work begun in early 1994 on the construction of the Physicists' Building (Building 40) is on the point Bldg. 40 Ð 5th floor of completion. The finishing works and final Mont-Blanc cleaning have begun, and handover of the building to CMS and ATLAS will take place as from the end CMS CMS Management of September. Secretariat

Removal of the CMS secretariat/CMS management CMS will be carried out during the week of 23-27 September. The new address of the Secretariat is 40- 5-B01. All the phone numbers of CMS secretaries will remain unchanged (see CMSDOC). ATLAS The removal for all the other CMS occupants of the Bldg. 40 will start at the end of September. Further information and precise dates still need to be fixed, but people will be informed a.s.a.p. by e-mail. There will be a cafeteria on the ground-floor of the Jura building. The official opening ceremony will take place on the 20th of December 1996.

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CMS Bulletin 96-01 CMS Calendar

September October

Date Day CMS Meetings Non-CMS Meetings Date Day CMS Meetings Non-CMS Meetings 1 Sun 1 Tue 2 Mon Decision TB 2 Wed 3 Tue 3 Thu TK TB Research Board 4 Wed 4 Fri 5 Thu 5 Sat 6 Fri Detec. Interface WG 6 Sun 7 Sat 7 Mon TB 8 Sun 8 Tue 9 Mon CMS Week in Aachen 9 Wed 1 0 Tue CMS Week in Aachen 1 0 Thu 1 1 Wed CMS Week in Aachen 1 1 Fri 1 2 Thu CMS Week in Aachen 1 2 Sat 1 3 Fri CMS Week in Aachen 1 3 Sun 1 4 Sat 1 4 Mon Decision TB 1 5 Sun 1 5 Tue 1 6 Mon Atlas/Opal (Outside) 1 6 Wed TRIGGER/DAQ Week 1 7 Tue 1 7 Thu TRIGGER/DAQ Week 1 8 Wed 1 8 Fri TRIGGER/DAQ Week 1 9 Thu 1 9 Sat 2 0 Fri 2 0 Sun 2 1 Sat 2 1 Mon MB TK Week 2 2 Sun 2 2 Tue FB TK Week 2 3 Mon TB SPC/Alice Week 2 3 Wed TK Week 24 Tue SPC 24 Thu RRB TK Week RRB 25 Wed FC 25 Fri TK Week 26 Thu CC 26 Sat 27 Fri CC 27 Sun 2 8 Sat 2 8 Mon TB 2 9 Sun 2 9 Tue Meeting with Referees Meeting with Referees 3 0 Mon TB 3 0 Wed 3 1 Thu LHCC

November December

Date Day CMS Meetings CMS & Non-CMS Meetings Date Day CMS Meetings Non-CMS Meetings 1 Fri LHCC 1 Sun 2 Sat 2 Mon Decision TB 3 Sun 3 Tue 4 Mon TB ECAL Week 4 Wed 5 Tue Int. Review ECAL Week 5 Thu 6 Wed Int. Review ECAL Week 6 Fri Detec. Interface WG 7 Thu Int. Review ECAL Week TK TB 7 Sat 8 Fri Int. Review ECAL Week Int. Review: TRIDAS 8 Sun 9 Sat Int. Review: MB 9 Mon CMS week CERN Opal Week 1 0 Sun 1 0 Tue CMS week CERN 1 1 Mon TB 1 1 Wed CMS week CERN 1 2 Tue 1 2 Thu CMS week CERN 1 3 Wed 1 3 Fri CMS week CERN 1 4 Thu 1 4 Sat 1 5 Fri 1 5 Sun 1 6 Sat 1 6 Mon TB SPC 1 7 Sun 1 7 Tue SPC 1 8 Mon TB 1 8 Wed FC 1 9 Tue 1 9 Thu CC 2 0 Wed 2 0 Fri C 2 1 Thu Research Board 2 1 Sat 2 2 Fri 2 2 Sun 2 3 Sat 2 3 Mon 2 4 Sun 2 4 Tue 2 5 Mon Atlas Week 2 5 Wed 2 6 Tue 2 6 Thu 2 7 Wed 2 7 Sat 2 8 Thu 2 8 Sun 2 9 Fri 2 9 Mon 3 0 Sat 3 0 Tue Holidays at CERN or U.S.A 3 1 Wed

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CMS Bulletin 96-01 CMS General Information

Madeleine Azeglio - Ext. 72277 and SECRETARIAT Delphine Labrousse - Ext. 78511 [email protected] [email protected] Office: 40-5-B01 (Until 24 Sept. 32-2-A22) Phone: +41 (22) 767 22 77 (inside CERN ext. 72277) - Technical Notes (WWW) Fax: +41 (22) 767 89 40 - Documentation - Reservations of Conference rooms Marie-Claude Pelloux (Dudragne) - Ext. 74539 - CERN material requests, shipping requests, [email protected] purchasing orders - Principal Secretary - Leave requests for CERN Staff - Secretary of the CMS Management - Organization of Federal CMS meetings - Travel arrangements USEFUL PHONE NUMBERS - Dispatch of e-mails to the Collaboration Test Beam Areas - CMS CERN Team Matters Prevessin - Hall 887 Toke Reber - Ext. 74608 [email protected] H2 - General (Muons, tracking...): Ext. 76776 H4 - Calorimetry: Ext. 76771 / 77743 - Administrative Assistant of the CMS Technical Coordinator & the CMS Resource Manager Meyrin - Hall 180 X7 - Tracking: Ext. 76081 - Control room: Ext. 76082 Guy Martin - Ext. 74650 [email protected] X3 - ECAL Beam line: Ext. 76056 - Transparencies Tracking Lab: Bldg. 186 - Ext. 75725 Crystals Labs: Bldg. 27 - Ext. 76286, 72060, 73841 - Picture Library (WWW) - Office informatics

Sandrine Couturier - Ext. 79391 and PROCEDURE FOR NEWCOMERS Marie-Pierre Fossioz - Ext. 79391 [email protected] 1. PLEASE FIRST COME TO THE CMS [email protected] SECRETARIAT to be registered in CMS - People & Institutes Databases (WWW) 2. To be registered at CERN please go to the Users - Registration of Newcomers Office (61-R-020, opposite the cafeteria in Main - Contacts with Users' Office (attestations...) Bldg) - Allocation of offices (keys...) 3. To open a computer account please contact: - Film badges Martti Pimia - 40-3-A20 - [email protected] - Access cards or Werner Jank - 40-3-A24 - [email protected] or Nick Sinanis - 40-3-A12 - [email protected] 4. To get a film badge: M. Gros (24-E-011)

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