DOCSLIB.ORG

People and Things

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
People and Things People and things On people Among the awards distributed at the recent joint annual meeting of the American Physical Society and the American Association of Phy­ sics Teachers were the Dannie Heineman Prize for Mathematical Physics, to John C. Ward of Mac- quarie University, Australia, for his contributions to the development of particle gauge theories, and the Oersted Medal for physics teach­ ing, to 1.1. Rabi of Columbia Univer­ sity. LEP people Now that the LEP electron-positron collider project is under way at CERN, decisions have been taken on the management of the machine construction and on preparations for the experimental programme. At CERN itself, a LEP Manage­ ment Board has been set up to sending institution. We have advised One of the international discussion panels study and propose solutions to at the Pan American Symposium on High and encouraged the first user group Energy Physics and Technology, held at major problems of the construction from Mexico. We are seeking mod­ Cocoyoc, Mexico, in January. Left to right, programme and to share respon­ est Foundation and International R. Taylor from SLAC (representing Canada), sibility for major decisions concern­ Fermilab Director Leon Lederman Agency support in order to minimize (representing the US), J. Flores of Mexico, ing the project. The members of the problems of government involve­ M. Kreisler of the US, C Avilez of Mexico, the Board (appointed for two ment. Agreements between institu­ and Burt Richter also from SLAC, years) are E. Picasso (Chairman), representing the US. tions are simple to administer and G. Plass, H. Laporte. H. P. Reinhard, should be the rule as far as possible. L. Resegotti and W. Schnell, to­ In the course of the next few years, if gether with M. Crowley-Milling (for Fermilab and other US Laboratories 1982). CERN Director General can play host to 20, 30 or 50 teach­ H. Schopper and Technical Director ers and researchers from Latin G. Brianti are ex-officio members. America, each of these will in turn To prepare for the experimental touch hundreds of students and col­ programme, a LEP Experiments leagues and the leverage will be very Committee is being set up and its great. Being even more optimistic, first meeting scheduled for we can look forward, perhaps in five 24 March. G. Wolf of DESY has or ten years, to the serious notion of been appointed Chairman. a Pan American Accelerator Labora­ To advise on decisions concern­ tory — a hemispheric Centro Ameri­ ing the machine, a LEP Machine cano de Investigaciones Nu- Advisory Committee has been cleares.' operating for some time under the Chairmanship of G.A. Voss of DESY. 110 CERN Courier, April 1982 DESY Director Volker Soergel (left) congratulates Gustav-Adolf Voss on the news of his being nominated Doctor Honoris Causa by the University of Heidelberg. LEP Project Leader Emilio Picasso. (Photo DESY) Other members are J. Le Duff, boost the available luminosity, a sics programme, but lack of money G. Rees, B. Richter, G. Saxon, A.N. technique much in vogue these could result in one or other of the Skrinsky, S. Tazzari and M. Tigner, days. projects being held back. If insuf­ together with Sir John Adams, ficient funds were available, some­ G. Brianti, E. Gabathuler, A. Hutton, US Funding thing would have to go, and while E. Picasso and H. Schopper from nobody wanted to see imaginative CERN. In bad shape with the 1982 budget projects curtailed, a choice had to inherited from the previous admin­ be made on a least of evils basis. istration, the US high energy phy­ The proposed victim was the Gustav-Adolf Voss, member of sics funding has been reviewed ISABELLE project for 400 GeV the DESY Directorate and Chairman by the Reagan administration in colliding proton beams at Brook- of CERN's LEP Machine Advisory the light of the current US econ­ haven. The committee underlined Committee, has been made Doctor omic situation. In the meantime the considerable scientific merit Honoris Causa by the University the US High Energy Physics Advi­ of this project, and strongly recom­ of Heidelberg. The award came in sory Panel (HEPAP) formed a com­ mended its timely completion. special recognition of his contribu­ mittee under the chairmanship of However it was felt that further tions to the development of stor­ George Trilling to look at the impli­ erosion of funding would damage age rings, and the role he played cations of different possible fund­ the project and prevent its timely in the construction of the PETRA ing levels for the long range plan­ completion. electron-positron ring at DESY. ning of US high energy physics. The initial budget figure which Working with Ken Robinson in the A number of projects are under has emerged is one of $429 mil­ late 1960s, he helped develop the way or being studied at Brookhav- lion. Although this represents an idea of low beta insertions' to en, Fermilab, SLAC and Cornell. increase over the inherited budget, compress the beams at the colli­ Diversity has always been a strong it could be insufficient for the sion regions of storage rings and point of the US high energy phy­ present ISABELLE scheme. CERN Courier, April 1982 111 Ten years ago, on 1 March 1972, Fermilab Director Robert R. Wilson toasted the attainment of 200 GeV, the nominal Main Ring design energy. In 1976 this was boosted to 500 GeV, and now the Laboratory looks towards 1 TeV (1000 GeV). (Photo Fermilab) on the way to completion of the Fermilab Energy Saver/Doubler has been achieved with the oper­ ation of a 2400 foot-long supercon­ ducting magnet string comprising three-quarters of a sector of the total ring. Tests of the first sector of the Saver have been under way since mid-January. Nearly half a mile of superconducting bending magnets in the main ring tunnel have been cooled and powered to 2200 A which is equivalent to an energy of approximately 500 GeV. The string includes roughly one-eighth of the Saver magnets. Three separate cryogenic loops are in operation from the A 1, A2, and A3 service buildings. The total system is operating in conjunction with three satellite refrigerators and the Central Helium Liquefier. Twenty-four half cells are in the string with each half cell consisting of four dipoles, one quadrupole While Brookhaven's operating Tevatron II approval and a spool piece which contains funds have been increased, allow­ the correction elements. ing for an extensive superconduct­ The Tevatron II project at Fermilab Many tests are under way as ing magnet research and develop­ to convert the Energy Saver to full the current through the system is ment programme, initially no funds 1000 GeV experimental operation raised by stages. The entire sys­ are earmarked for ISABELLE con­ has received US government au­ tem has been ramped at the design struction. However it is hoped that thorization. The construction pro­ rate of 100 A/s for several hours support will be restored in the ject is authorized for $49 million. with no unexpected problems. The months ahead as the budget is It includes the extraction system system is also periodically dumped finalized. to bring the beam out at 1000 into a resistive load, or made non- GeV, upgrading the external beam superconducting (quenched) by Work on the 3.8 km circumfer­ switchyard to handle transporting turning on internal heaters, in order ence ISABELLE tunnel began in and targetting of beams up to to test the power supplies, magnet 1978 and is now largely complete. 1000 GeV, and modification and quench protection and refrigerator The project was originally seen as construction of new secondary recovery. Tests are being run on taking about ten years, however beams and support facilities in pressurization, refrigeration, the difficulties were encountered in each of the three existing experi­ control system, power supplies, the development of the supercon­ mental areas to fully exploit the vacuum and general safety sys­ ducting magnets to handle the par­ physics capabilities of the 1 TeV tems. Operation at 1000 A occur­ ticles. Although these problems accelerator. The project will start red on 12 February, 1500 A on 13 have now been largely solved, the this year and be fully complete in February, and 2200 A on 19 Feb­ project was nevertheless held up. late 1985. Tom Kirk, Deputy Head ruary. Over the next months the However good progress continues of the Research Division, is Project current will be gradually raised to to be made using the new magnet Manager for Tevatron II. 4000 A. All of these tests are be­ design (see page 96). Meanwhile another key milestone ing carried out while the present CERN Courier, April 1982 The Crystal Ball detector being prepared for removal from the East Pit at the SPEAR electron-positron ring at SLAC and shipment to DESY for installation in the revamped DORIS ring. accelerator is in operation for the normal 400 GeV research pro­ gramme. The system is handled from the existing central control room in parallel with normal opera­ tion. SLC Workshop Some 150 physicists met at SLAC recently to discuss reports on the experimental prospects at the SLAC Linear Collider (SLC). This meeting concluded the first phase of study for the SLC physics pro­ gramme. Most of the agenda was devoted to the presentation of the reports of the eight specialist subgroups set up last year (see June 1981 issue, page 199). These reports are being published as proceed­ ings. On view was new hardware de­ veloped for SLC, including a new beam position monitor to handle the intense SLC bunches.
Load more

Recommended publications
  • CERN Courier–Digital Edition
    CERNMarch/April 2021 cerncourier.com COURIERReporting on international high-energy physics WELCOME CERN Courier – digital edition Welcome to the digital edition of the March/April 2021 issue of CERN Courier. Hadron colliders have contributed to a golden era of discovery in high-energy physics, hosting experiments that have enabled physicists to unearth the cornerstones of the Standard Model. This success story began 50 years ago with CERN’s Intersecting Storage Rings (featured on the cover of this issue) and culminated in the Large Hadron Collider (p38) – which has spawned thousands of papers in its first 10 years of operations alone (p47). It also bodes well for a potential future circular collider at CERN operating at a centre-of-mass energy of at least 100 TeV, a feasibility study for which is now in full swing. Even hadron colliders have their limits, however. To explore possible new physics at the highest energy scales, physicists are mounting a series of experiments to search for very weakly interacting “slim” particles that arise from extensions in the Standard Model (p25). Also celebrating a golden anniversary this year is the Institute for Nuclear Research in Moscow (p33), while, elsewhere in this issue: quantum sensors HADRON COLLIDERS target gravitational waves (p10); X-rays go behind the scenes of supernova 50 years of discovery 1987A (p12); a high-performance computing collaboration forms to handle the big-physics data onslaught (p22); Steven Weinberg talks about his latest work (p51); and much more. To sign up to the new-issue alert, please visit: http://comms.iop.org/k/iop/cerncourier To subscribe to the magazine, please visit: https://cerncourier.com/p/about-cern-courier EDITOR: MATTHEW CHALMERS, CERN DIGITAL EDITION CREATED BY IOP PUBLISHING ATLAS spots rare Higgs decay Weinberg on effective field theory Hunting for WISPs CCMarApr21_Cover_v1.indd 1 12/02/2021 09:24 CERNCOURIER www.
    [Show full text]
  • ISABELLE DESIGN Studyk
    © 1973 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. ISABELLE DESIGN STUDYk F. E. Mills Brookhaven National Laboratory Upton, New York Introduction Intersection Regions Following the 1970 BNL Summer Study on AGS Utili- The philosophy of design of the intersection re- zation, John Blewett and I began to consider the design gions is to remove the momentum dispersion, allow the of colliding beam systems in the center of mass energy beam to spread in size, to pass it through a strong range from 200 GeV to 2000 GeV, since it seemed to us lens and bring it to a small focus at the intersection then that significant new phenomena could be expected region (low p). The process is then reversed to return in nuclear interactions in that energy range. We took it to the normal lattice. In some cases (elastic as initial conditions, that we would employ the emer- scattering), the beam is kept large, to obtain good gent technology of superconducting magnets, and that angular resolution. What we have done is to design a we would employ the AGS as the injector, hence requir- "catalog" of intersecting regions, in cooperation with ing the acceleration of the full stored beam to final experimentalists, to fit the needs of particular exper- energies in the storage device. In the summer of 1971, iments.
    [Show full text]
  • A Pp and E+E- Collider in a 100Km Ring at Fermilab
    A pp and e+e- collider in a 100km ring at Fermilab Tanaji Sen In collaboration with C.M.Bhat, P.C. Bhat, W. Chou, E. Gianfelice-Wendt, J. Lykken, M.K. Medina, G.L. Sabbi, R. Talman 5th TLEP Workshop July 25-26, 2013 Fermilab Outline Motivation • Snowmass study • TLEP design study in a 80 km ring • Past studies of VLHC and VLLC in a 233 km ring in 2001 • Now a “more modest” ring of circumference = 100 km • Design of a pp collider with 100 TeV CM energy • Design of an e+e- collider with 240-350 GeV CM energy • No discussion of - Cost - Politics of acquiring 100 km of real estate T. Sen pp and e+e- colliders 2 Hadron Colliders - Wikipedia Hadron colliders Intersecting Storage Rings CERN, 1971–1984 Super Proton Synchrotron CERN, 1981–1984 ISABELLE BNL, cancelled in 1983 Tevatron Fermilab, 1987–2011 Relativistic Heavy Ion Collider BNL, 2000–present Superconducting Super Collider Cancelled in 1993 Large Hadron Collider CERN, 2009–present High Luminosity Large Hadron Proposed, CERN, 2020– Collider Very Large Hadron Collider Theoretical T. Sen pp and e+e- colliders 3 Hadron Colliders ISR SPS Tevatron RHIC (pp) LHC (2012) Circumference [km] 0.94 6.9 6.3 3.8 26.7 Energy [GeV] 31 315 980 255 4000 Number of bunches dc 6 36 107 1380 Bunch spacing [ns] - 1150 396 108 50 Bunch intensity [x1011 ] - 2.75 (3.1/1 ) 2.0 1.7 Particles/beam [x 1014] 9.8 7.8/4.2 112/36 143 3089 Trans. rms Emitt [ μm] 1.5/0.15 (3/1.5) 3.3 2.5 Beam-beam tune shift 0.0035x8 0.005x3 0.013x2 0.007x2 0.01x2 Luminosity [x1032 cm-2s-1] 1.3 0.06 4.0 2.3 77 # of events/crossing 12 37 Stored beam energy [MJ] 0.005 0.04 1.75/0.57 0.57 140 T.
    [Show full text]
  • SCOPE of the WORKSHOP D. Cline Fermi National
    SCOPE OF THE WORKSHOP D. Cline Fermi National Accelerator Laboratory and University of Wisconsin at Madison A Workshop was held during the week of March 1. The very interesting talk of R. Feynman on 27-31 at the Lawrence Berkeley Laboratory in ultra high energy interactions (Ua) and the historical Berkeley, California. The purpose of the Workshop surveys of beam cooling by A. Sessler and was to discuss various beam-cooling techniques and to R. R. Wilson. investigate the possibility of constructing high luminosity proton-antiproton storage rings. 2. The general conviction that pp machines pro­ Herman Grunder and other members of the LBL staff posed in the present CERN and Fermilab schemes are were largely responsible for the efficient operation of sound (UIc, d; IVc; Vb). the Workshop and the success. The Workshop was jointly sponsored by Fermilab and LBL. 3. The discussion of the cooling of high energy That this was the first workshop totally devoted proton-antiproton beams by electrons (Rubbia, Month, to beam cooling and to high luminosity pp storage rings Ruggiero) or by synchrotron radiation (Wilson). The indicates the close coupling between the two subjects. report of Ruggiero, Vh, was completed after the The construction of pp storage rings is an old dream Workshop and is reproduced here for completeness. of accelerator physicists, the practical realization of these machines certainly relies on beam-cooling tech­ 4. The understanding of improvements in target niques. The late G. Budker often discussed the possi­ efficiency that can raise the p yield by a considerable bility of pp storage rings and realized that beam factor (IVd).
    [Show full text]
  • Jan/Feb 2015
    I NTERNATIONAL J OURNAL OF H IGH -E NERGY P HYSICS CERNCOURIER WELCOME V OLUME 5 5 N UMBER 1 J ANUARY /F EBRUARY 2 0 1 5 CERN Courier – digital edition Welcome to the digital edition of the January/February 2015 issue of CERN Courier. CMS and the The coming year at CERN will see the restart of the LHC for Run 2. As the meticulous preparations for running the machine at a new high energy near their end on all fronts, the LHC experiment collaborations continue LHC Run 1 legacy to glean as much new knowledge as possible from the Run 1 data. Other labs are also working towards a bright future, for example at TRIUMF in Canada, where a new flagship facility for research with rare isotopes is taking shape. To sign up to the new-issue alert, please visit: http://cerncourier.com/cws/sign-up. To subscribe to the magazine, the e-mail new-issue alert, please visit: http://cerncourier.com/cws/how-to-subscribe. TRIUMF TRIBUTE CERN & Canada’s new Emilio Picasso and research facility his enthusiasm SOCIETY EDITOR: CHRISTINE SUTTON, CERN for rare isotopes for physics The thinking behind DIGITAL EDITION CREATED BY JESSE KARJALAINEN/IOP PUBLISHING, UK p26 p19 a new foundation p50 CERNCOURIER www. V OLUME 5 5 N UMBER 1 J AARYN U /F EBRUARY 2 0 1 5 CERN Courier January/February 2015 Contents 4 COMPLETE SOLUTIONS Covering current developments in high-energy Which do you want to engage? physics and related fi elds worldwide CERN Courier is distributed to member-state governments, institutes and laboratories affi liated with CERN, and to their personnel.
    [Show full text]
  • Deliberation Document on the 2020 Update European Strategy
    DELIBERATION DOCUMENT ON THE 2020 UPDATE OF THE EUROPEAN STRATEGY FOR PARTICLE PHYSICS The European Strategy Group _Preface The first European Strategy for Particle Physics (hereinafter referred to as “the Strategy”), consisting of seventeen Strategy statements, was adopted by the CERN Council at its special session in Lisbon in July 2006. A first update of the Strategy was adopted by the CERN Council at its special session in Brussels in May 2013. This second update of the Strategy was formulated by the European Strategy Group (ESG) (Annex 1) during its six-day meeting in Bad Honnef in January 2020. The resolution on the 2020 Update of the European Strategy for Particle Physics was adopted at the 199th Session of the CERN Council on 19 June 2020. The ESG was assisted by the Physics Preparatory Group (Annex 2), which had provided scientific input based on the material presented at a four-day Open Symposium held in Granada in May 2019, and on documents submitted by the community worldwide. In addition, six working groups (Annex 3) were set up within the ESG to address the following points: Social and career aspects for the next generation; Issues related to Global Projects hosted by CERN or funded through CERN outside Europe; Relations with other groups and organisations; Knowledge and Technology Transfer; Public engagement, Education and Communication; Sustainability and Environmental impact. Their conclusions were discussed at the Bad Honnef meeting. This Deliberation Document was prepared by the Strategy Secretariat. It provides background information underpinning the Strategy statements. Recommendations to the CERN Council made by the Working Groups for possible modifications to certain organisational matters are also given.
    [Show full text]
  • Toward the Limits of Matter: Ultra-Relativistic Nuclear Collisions at CERN
    EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH CERN-OPEN-To be specified 21 May 2015 Toward the Limits of Matter: Ultra-relativistic nuclear collisions at CERN Abstract Strongly interacting matter as described by the thermodynamics of QCD undergoes a phase transi- tion, from a low temperature hadronic medium to a high temperature quark-gluon plasma state. In the early universe this transition occurred during the early microsecond era. It can be investigated in the laboratory, in collisions of nuclei at relativistic energy, which create ”fireballs” of sufficient energy density to cross the QCD Phase boundary. We describe 3 decades of work at CERN, devoted to the study of the QCD plasma and the phase transition. From modest beginnings at the SPS, ultra- relativistic heavy ion physics has evolved today into a central pillar of contemporary nuclear physics and forms a significant part of the LHC program. Jurgen¨ Schukraft PH Division, CERN, CH-1211 Geneva 23, Switzerland Reinhard Stock Institute of Nuclear Physics, and FIAS, Max von Laue Strasse 1, D-60438 Frankfurt/Main, Germany arXiv:1505.06853v1 [nucl-ex] 26 May 2015 To appear in “60 Years of CERN Experiments and Discoveries”, Editors H. Schopper and L. di Lella, World Scientific Publishing, Singapore, 2015 Toward the Limits of Matter: Ultra-relativistic nuclear collisions at CERN 1 1 Strongly interacting matter We recall here the development of a novel research field at CERN, devoted to the phases and phase structure of matter governed by the strong fundamental force. Its proper field theory was discovered around 1970: Quantum Chromodynamics (QCD) addresses the fundamental interactions of elementary quarks, as mediated by gluons.
    [Show full text]
  • James W. Rohlf Feb
    James W. Rohlf Feb. 2017 Contact Boston University Physics Dept., 590 Commonwealth Ave., Boston, MA 02215, phone 617-353-2600, mobile 617-543-7455, Skype 617-275-3636, CERN +41754112573 email [email protected] Education Ph.D. in Physics 1980 Caltech, ”Investigations of Hadron Jets,” published in Nucl. Phys. B171 (1980) p. 1-37, Committee: G. C. Fox (advisor), C. Barnes, R. P. Feynman, R. Gomez M.S. in Physics 1975 University California, Los Angeles B.A. Physics and B.S. Mathematics 1973 University of Minnesota Employment Professor of Physics, Boston University, 1988 - present Associate Professor of Physics, Harvard University, 1985-8 Assistant Professor of Physics, Harvard University, 1981-5 (concurrent with Cornell and CERN) Scientific Associate (paid), European Center for Nuclear Research (CERN), 1982-4 Visiting Fellow, Laboratory of Nuclear Studies, Cornell University, 1980-2 Research Associate, Harvard University, 1980-1 Research Associate, California Institute of Technology, 1979-80 Current research Physics with the Compact Muon Solenoid (CMS) detector at the CERN LHC. First data col- lected in Dec. 2009. First physics paper published in Feb. 2010. Design and construction of the data concentrator (DCC and DCC2) to read out the CMS hadron calorimeter (HCAL) and other associated electronics ($5 M equipment money). Development of silicon photomultipliers (SiPM) and micro-CTA electronics (AMC13) for trigger, clock, and data acquisition in CMS. Led effort to establish source calibration procedure for calorimeter. Supervision of postdocs and and gradu- ate students. Work closely with the senior engineers at the Boston University Electronics Design Facility. Operations and detctor upgrades funded by US Department of Energy.
    [Show full text]
  • RCED-91-116 Federal Research: Status of DOE's Superconducting
    ._ * United States General Accounting Office -,_ Report to the Chairman, Committee on GAO the Budget, U.S. Senate April 1991 FEDERAL RESEARCH Status of DOE’s Superconducting Super Collider GAO,‘RCED-91-116 United States General Accounting Office GAO Washington, D.C. 20548 Resources, Community, and Economic Development Division B-227295.8 April 151991 The Honorable Jim Sasser Chairman, Committee on the Budget United States Senate Dear Mr. Chairman: In response to your March 7,1990, request we reviewed the status of the Department of Energy’s (DOE) Superconducting Super Collider (ssc), which will be located 30 miles south of Dallas, Texas. The ssc will be the world’s largest high energy particle accelerator-a research tool used by physicists to seek fundamental knowledge about energy and matter. DOE recently estimated that the ssc will cost $8.2 billion (in current-year dol- lars).’ You expressed concern that once the project progressed beyond the design phase, other problems could lead to further cost increases. As agreed with your office, this report provides information on the insta- bility in tenure of DOE and ssc Laboratory project management, uncer- tainties related to the ssc site geology, uncertainties and risks with magnet development and production, and Texas’ proposed contribution to the project’s costs. Both the ssc Laboratory and DOE’S ssc program office have experienced Results in Brief management instability because acting directors that have occupied key positions have frequently changed. In general, instability in key leader- ship positions can result in frequent changes of direction, diminished accountability, and little long-term operational planning.
    [Show full text]
  • Proton-Proton Colliding Beam Facility ISABELLE
    XI Intern, Conf» on High Energy Accelerators, Geneva, Switzerland, July 7-11, 1980= BNL 28019 H. Hahn' Brookhaven National Laboratory, Upcon, New York, 11973, USA. ABSTRACT This paper attetnpeo Co present. Che status of Che ISABELLE conotructioa project, uhich has Che objeccive of building a 400 * 600 GGV proton colliding beam facility. The major technical features of cho auperconduccing accelerators with their projected performance are described. Progress made so far, difficuleieo encountered, and Che program until completion ia 1986 is briefly reviewed. INTRODUCTION About one month ago Brookhaveu Nacional Laboratory celebraced the 20th anniversary of Che Alternating Gradient Synchrocon. This venerable accelerator has been Che instrument by which many significant discoveries were made. In order to continue its role as high energy physics center, studies for a proton—proton colliding beam facilicy were actively pursued at Broolthaven since Che early 1970's. ISABELLE, as this Intersecting Storage Accelerator wao baptized, made ics debut at the 8th International Conference on High Energy Accelerators here in Geneva in 1971^. The story goes chat Che AGS cons truce ion wao approved by the US Atonic Energy Commission six days afcer reception of Broolthaven • s leccer. This time it cook more then six years and Che writing of six design studieo^' before Che new accelerator Has recognized by authorizing Construction Planning 4 Design funds for Fiscal Year 1976 and 1977. Preliminary design was approved in Fi' 7(i and authorisation for construction followed then without further delay in FY 793). Froa its inception, ISABELLE was intended to serve as a major high energy facility which implied the following design criteria.
    [Show full text]
  • UNESCO Coupons
    value of the self-diffusion coefficient of SI, needed to arrange the arriving atoms on proper lattice sites. Linear extrapolation of this border line to higher temperatures yields an intersection point with the LCVD curve at about 1520 K. This value Is In good agreement with the temperature limit we find for single-crystal growth of rods. The orientation of the rod axis was found to be close to either <100> or < 110> crystal­ lographic directions. Conclusion Laser Induced deposition from the gas phase allows single-step production of material patterns with lateral dimensions from 0.5 µm to several mm. Typical deposi­ tion rates in laser pyrolysis are 10 to 100 Underlining the international character of CERN, both organisational and physical, the µm/s compared to 10 to some 100 A/s In start of construction of LEP — the 130-130 GeV electron-positron storage rings — was laser photolysis. The scanning velocities formally inaugurated by the Presidents of both France and Switzerland on 13 September. possible in laser pyrolysis reach at least up In the photograph taken at the ground-breaking ceremony are to the left of Francois to about 500 µm/s for strongly adherent Mitterand of France, Emilio Picasso, Director of the LEP Project and to the right of Pierre films. Laser pyrolysis at visible wavelengths Aubert of Switzerland, Herwig Schopper, the Director-General of CERN. The 27 km combines high deposition rates and small circumference of LEP will lie 3/4 in France and 1/4 in Switzerland. lateral dimensions of deposits with stan­ dard laser techniques, simple optics and adjustment.
    [Show full text]
  • Gustav Kramer Fest Ahmed Ali, DESY
    Gustav Kramer Fest Ahmed Ali, DESY 1 Gustav Kramer Fest Heavy Quark Physics with Gustav Kramer From Quark Models to SCET 2 Gustav Kramer Fest First Meeting with Gustav Kramer ● I first met Gustav Kramer in May 1972 at the CERN School of Physics, held in Grado, Italy. 1972 CERN School of Physics, Grado, Italy, 15-31 May 1972 3 Gustav Kramer Fest First Meeting with Gustav Kramer ● This was the first time that I attended an International School on Particle Physics. Emilio Picasso was the Director of the CERN School. Among the theorists who lectured were Murray Gell-Mann, Kurt Gottfried, Michel Gourdin, Chan Hong-Mo, Gustav Kramer and Roger Phillip. Gustav Kramer Grado 4 Gustav Kramer Fest First Meeting with Gustav Kramer ● Gustav Kramer gave a lecture_ course on ªElectron-Positron Interactionsº; this was the time when e + e colliders started to make their mark on particle physics, with the A.C.O. in Orsay, VEPP II in Novosibirsk, ADONE in Frascati, SPEAR at SLAC, and the Bypass Ring at CEA, all operating, with DORIS at DESY under construction. ● In his Introduction, he stated: ªThis field of high energy physics has been very interesting in the past, we can expect further interesting results in the futureº. 5 Gustav Kramer Fest Page 1 of Gustav Kramer©s Grado Lecture 6 Gustav Kramer Fest Figure from Gustav Kramer©s Grado Lecture Pion form factor with ρ- ω mixing measured at Orsay 7 Gustav Kramer Fest First Meeting with Gustav Kramer ● As a fresh postdoc, looking for the next position, I thought that with the start of DORIS, DESY would be a great place to go and work.
    [Show full text]