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 At CERN on 6 October to open the 'Britain at CERN' trade exhibition, UK Under-Secretary for Trade and Industry Edward Leigh admires the CERN VIP visitors book with CERN Director for Technical Tasks Hans Hoffmann and Wendy Korda. Mike Turner of Fermilab/Chicago argued that excluding tau neutrino masses down 25 MeV is crucial since a tau neutrino mass in the 0.5 to 25 MeV region is forbidden in many theories. The 25 MeV mass upper limit is clearly within experimental reach in the near future. One highlight was the examination of the so-called 1-prong decay problem, where a few percent of these decays may be unaccounted for. There are two ways of looking at the data: one is to pick the most precise measurement of each decay mode and the other is to use the world average of all measurements. Using the former method and assum­ ing the most precise measurement is the best, there is no significant ment has rightly brought Picasso in­ problem. With the latter method, Emilio Picasso tribute ternational honours and recognition. there is a discrepancy. As empha­ Finally Luigi Radicati di Brozolo cov­ sized by Michel Davier in his sum­ Friends and colleagues of Emilio ered Picasso's long interest in experi­ mary talk, there are significant Picasso attended a special event at mental searches for gravitational differences between some of the CERN on 25 September to pay trib­ waves. Picasso's talents are now in­ measurements of the branching ute to his 29 years of contributions to vested in a new career as director of ratios, which suggests problems in CERN's success. Recalling Picasso's Pisa's Scuola Normale Superiore. some of the experiments. Reconcilia­ vital role in the famous lg-2' precision tion means more precise measure­ experiments to measure the mag­ ments, both by the reconstruction of netic moment of the muon, Francis the decays and by a global analysis Farley stressed Picasso's enthusi­ New director at Legnaro of all decays in a single experiment. asm for physics and people, and his The next tau workshop will tell more. uncanny ability to motivate. From Massimo Nigro has been appointed The Tau Workshop was organized 1972-77 Picasso was leader of what by the Italian National Institute of Nu­ by K.K. Gan and his colleagues at became known as Experimental clear Physics as director of the OSU. Physics Division. Covering this pe­ Legnaro National Laboratory for the riod, Jack Steinberger had collected next three years, replacing Piero Dal From K.K. G an many colourful Picasso tributes Ça Piaz, who has been elected Rector of series of sunny days'). In 1980 came the University of Ferrara. the fateful call to be project leader for The Legnaro National Laboratory, the LEP project, the largest accelera­ near Padua, is the main Italian Labo­ tor ever built, using existing CERN ratory for nuclear physics. Its princi­ /A/FA/ President finance and manpower, and close to pal facilities are a tandem Van de a range of mountains. Gus Voss of Graaff accelerator and a supercon­ Leading Italian theorist Luciano DESY described how new teams ducting linac for heavy ion beams Maiani of Rome has been designated were carved out of the existing (ALPI accelerator). as next President of the Italian Istituto CERN infrastructure and how, after Massimo Nigro is Professor of Nazionale di Fisica Nucleare (INFN), an inevitably bumpy ride, the ma­ Physics at Padua and his main re­ for three years, to succeed Nicola chine delivered on time. In recent search interests are in the field of ex­ Cabibbo. years this remarkable accomplish- perimental elementary particles, us- 24 CERN Courier, December 1992 Rear panel of one of the four concially arranged TRD wire chambers This project was commissioned by the University of Bonn, designed and completely produced together with the University and installed at DESY Hamburg. All components were produced by the glass fibre compression process, the outer surfaces were copperplated and the components were bonded and machined so that they were ready to install. Stesalit AG 1) The superimposed detail in the top Kunststoffwerk picture shows a complicated construction in conjunction with CH-4234 Zullwil SO high precision. Telephone 41.61.791 06 01 Fax 41.61.791 06 04 25a Circle advertisement number on reader service form Workstations (for everyone !) BusStations are fully compatible with access to more than 3500 programs. Be manufacturer independent in your open systems networking application domains... - Professional software development. - Innovative research and development. - Control and data acquisition systems. - Administrative systems. ... at excellent price/performance ratios: Model 1, 8.3 Spec-Marks SFR 9,950 Model 1+, 13.4 Spec-Marks SFR 13,900 Model 2, 23.7 Spec-Marks SFR 19,900 (6.2 % ICHA not included) Included in the prices are 20" colour monitor, Ethernet, mouse, keyboard, large hard-disk, floppy-disk, large memory, SCSI-2, complete system software and utilities. Many options available: Graphics accelerator, memory and mass storage upgrades, CRT's, etc. Our wide range of VXI products may be used with the BusStation to build DAQ and control Kinetic Systems systems. Standard or customized software International available. Ask also for our multimedia solution for the BusStation. FOR MORE INFORMATION CONTACT US TODAY. 3 chemin Tavernay • 12 18 Geneva, Switzerland ASK FOR B. IVESDAL OR W. STIEGER AT: [41] (22) 798 44 45 • FAX [41] (22) 798 05 25 22 Circle advertisement number on reader service form CERN Courier, December 1992 25 Participants from the NATO Advanced Summer Institute on Particle Production in Highly Excited Matter, held at II Ciocco near Pisa this summer, take time off in Florence. A 1) V A N C E D STUDY INSTITUTE . ii...L.i P10)X..M .S G I iXC i) ii il IL CIOCCO, 5 5020 CASTELVECCH1 0 PASCOL1 (PROVINCE OF LUCCA, TUSCANY), ITALY JULY 12-24, 1992 ing electron-positron storage rings. of the Solenoidal Detector Collabora­ ness production, and theoretical con­ He previously served as Vice-presi­ tion (SDC) for the SSC. cepts of highly excited matter. dent of Istituto Nazionale di Fisica Apart from the generous NATO and as Director of the Physics De­ support, significant financial contribu­ NATO Advanced Summer Institute partment of the University of Padua. tions came from the US Department 1992 of Energy and National Science Foundation, the Italian INFN, and the Yerevan Director Particle Production in Highly Excited German BMFT Active support came Matter was the topic of a NATO Ad­ from major research Laboratories in­ vanced Summer Institute held at II Ruben Mkrtchyan is Director of the cluding Pisa, GSI Darmstadt, and Ciocco near Pisa this summer. Or­ Yerevan Physics Institute in Yerevan Brookhaven. ganized and directed by H.H. for the next two years, succeeding Gutbrod (GSI and CERN), G. Andrey Amatuni. For the same period Bellettini (INFN-Pisa) and J. Rafelski Hrachia Asatryan becomes 1st Kolar-less (Arizona), the meeting brought to­ Deputy Director for Research and gether leading experts from both nu­ Levan Vardanyan 1st Deputy Direc­ The laboratory 2.3 km below ground clear and particle physics with re­ tor for Production and Economic Ac­ in the Kolar Gold Fields in Southern tivity. searchers from major US and India is being closed after a decision European nuclear and high energy to stop mining operations. Set up in laboratories. About 100 students the 1950s by the Tata Institute for from more than 20 countries at­ Fundamental Research, the labora­ Moves at Fermilab tended. tory reported its first cosmic ray neu­ Main interest was the behaviour of trinos in 1964. When interest in At Fermilab, Roger Dixon, formerly highly excited hadronic matter seen Grand Unified Theories motivated the head of DO Department, has been through particle production and emis­ search for proton decay, Kolar hit the appointed acting head of the Re­ sion in high energy nuclear collisions. physics headlines ten years ago with search Division, replacing Peter After present studies at the the first candidate events. These Garbincius, who has moved to a new Brookhaven AGS and CERN's SPS, were subsequently attributed to neu­ assignment in the Physics Section. new frontiers will soon be opened up trino background. Gene Fisk takes over at DO. at the RHIC and LHC colliders at the respective Laboratories, where the Frank Turkot becomes head of the goal is the search for deconfined 1993 major meetings Technical Support Section. Former quark-gluon plasma. A major theme Head of Technical Support Paul at the Institute was the interrelation Cornell has been selected by the In­ Mantsch has moved to a new job as between experimental observables, ternational Union of Pure and Applied project manager for the calorimeter such as particle spectra and strange­ Physics (IUPAP) as the site of the 26 CERN Courier, December 1992 Anywhere science goes, BURLE photomultipliers take the lead. From 450 kilometers above many planned for the SSC), the earth, NASA's Gamma Ray calorimeter experiments, Observatory is increasing our geophysical exploration and understanding of the universe. medical analytical systems. And on three of its telescopes, If your science calls for BURLE photo- photomultiplier multiplier tubes, let BURLE tubes are the help you take the rprimary lead; Fbr more v components ? information, call us for gamma radiation detection. today in the United States at BURLE photomultipliers 1 -800-827-8823 In Europe, have been an integral part of 44-93-276-5666. space science for years, and they'll be.onboard the Mars Probe in 199Ê^i|on earth, they're used in high-energy BURLE physics experiments (including ELECTRON TUBES Photo-NASA 98 Circle advertisement number on reader service form F.W.Bell 9000 Series FREE DATA ACQUISITION AND Gaussmeters INSTRUMENT CONTROL CATALOGUE IEEE 488 and 1993 VXIbus Control, Data Acquisition, a HAdMIFÛ» [FOULE and Analysis The 9000 Series is made up of six models with features never before available in a gaussmeter.
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]
  • Jul/Aug 2013
    I NTERNATIONAL J OURNAL OF H IGH -E NERGY P HYSICS CERNCOURIER WELCOME V OLUME 5 3 N UMBER 6 J ULY /A UGUST 2 0 1 3 CERN Courier – digital edition Welcome to the digital edition of the July/August 2013 issue of CERN Courier. This “double issue” provides plenty to read during what is for many people the holiday season. The feature articles illustrate well the breadth of modern IceCube brings particle physics – from the Standard Model, which is still being tested in the analysis of data from Fermilab’s Tevatron, to the tantalizing hints of news from the deep extraterrestrial neutrinos from the IceCube Observatory at the South Pole. A connection of a different kind between space and particle physics emerges in the interview with the astronaut who started his postgraduate life at CERN, while connections between particle physics and everyday life come into focus in the application of particle detectors to the diagnosis of breast cancer. And if this is not enough, take a look at Summer Bookshelf, with its selection of suggestions for more relaxed reading. 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. ISOLDE OUTREACH TEVATRON From new magic LHC tourist trail to the rarest of gets off to a LEGACY EDITOR: CHRISTINE SUTTON, CERN elements great start Results continue DIGITAL EDITION CREATED BY JESSE KARJALAINEN/IOP PUBLISHING, UK p6 p43 to excite p17 CERNCOURIER www.
    [Show full text]
  • The Standard Model
    The Standard Model by Christine Sutton In May 1983, the central detector of the UA1 experiment at CERN's proton-antiproton collider showed the tell-tale signature of the long-awaited Z particle as it decays into an electron-positron pair (arrowed). As the electrically neutral carrier of the weak force, the Z° plays a vital role in the Standard Model. The initial evidence from Fermilab (see previous article) for the long awaited sixth ('top') quark puts another rivet in the already firm structure of today's Standard Model of physics. Analysis of the Fermilab CDF data gives a top mass of 174 GeV with an error of ten per cent either way. This falls within the mass band predicted by the sum total of world Standard Model data and underlines our understanding of physics in terms of six quarks and six leptons. Model encompasses all the elemen­ their interactions emerge. Instead it is In this specially commissioned tary particles we now know and three an amalgam of the best theories we overview, physics writer Christine of the fundamental forces. The basic have, which we can bolt together Sutton explains the Standard building blocks are two sets or because they have enough in com­ Model. "families" or "matter particles" - the mon to suggest an underlying unity, quarks and the leptons (see page 5). although due to our ignorance the These particles interact with each joins still clearly show. t is nearly 100 years since the other through the exchange of force The structure as a whole rests on a I discovery of the first subatomic carriers or "messengers".
    [Show full text]
  • The Challenge of Neutrinos by Christine Sutton
    The challenge of neutrinos by Christine Sutton Neutrino pioneers - left to right, Paul Dirac, Wolfgang Pauli., Rudolf Peierls. (Photo MP Niels Bohr Library) Earlier this year, a team of physicists working at Los Alamos claimed a possible sighting of neutrino oscillations (June, page 13). However even before the claim appeared in the scientific literature, newspaper reports had leaked the possible findings and their implications. Detecting particles which can pass unhindered through the Earth provides the ultimate physics challenge. Neutrinos have always captivated public imagination and make compelling reading. In the wake of the latest neutrino episode, Oxford physi­ cist and science writer Christine Sutton looks back on the short but volatile history of the neutrino and its attendant publicity. strangers to controversy, for they beta-decay electrons varies continu­ With the availability of high were in a sense born amidst it, and ously up to a maximum, with peaks energy neutrino beams in the as recent work on neutrino oscilla­ ("lines") at only a few energies. And 1970s, physicists eagerly tions demonstrates they continue to he was able to explain how the scoured each new batch of data fuel debate. This is of course largely photographic technique could "fake" for signs of exciting new physics. to do with the fact that neutrinos have lines through its great sensitivity to But few initial 'sightings' proved no electric charge and experience small changes in intensity. to be of substance. One of the only the weak nuclear force, making The First World War interrupted major problems faced by such them supremely difficult to detect.
    [Show full text]
  • Taking the Subatomic Grand Tour the Secrets of the World of Elementary Particles Revealed
    book reviews Taking the subatomic Grand Tour The secrets of the world of elementary particles revealed. The Particle Odyssey: A Journey to the Heart of Matter by Frank Close, Michael Marten & FERMILAB Christine Sutton Oxford University Press: 2002. 246 pp. £29.95, $45. Ken Peach The development of the standard model of particles and their interactions is one of the major scientific achievements of the twen- tieth century. The electron was the first ‘elementary particle’ to be discovered, by J. J. Thomson (working largely on his own) in 1897, and the top quark was the last of the standard model’s ‘fundamental fermions’ to be discovered, by two large teams at the Tevatron near Chicago in 1995. In between, special and general relativity, quantum mechanics and a deep understanding of symmetry (explicit and hidden, global and local, absolute and spontaneously broken) have transformed our understanding of the dynamics of the Universe. Within this frame- work, a remarkably complete description of the way in which the Universe works has Problem particle: the top quark, here decaying into muons (blue tracks), wasn’t discovered until 1995. been developed, and all but one of its ingre- dients experimentally verified — only the ingredient (quarks, leptons, gauge bosons tions. Most of the loopholes have since been elusive Higgs particle remains undetected. and other whimsies associated with high- closed: the top quark has now been discov- The Particle Odyssey describes a century energy physics) is described and illustrated, ered, the electroweak sector has survived of discovery and creativity through a series along with photographs and biographical precision scrutiny at the Large Electron– of stunning images and photographs.
    [Show full text]
  • The Great Survivor
    Dubna - the great survivor atoms are now around the corner. This year, as CERN celebrates its chine in the world. This machine is The Conference closed with the 40th anniversary (November, page still operational, and features in the award of N. Hamann Prize to A. 26), not far behind in the celebration Guinness Book of records as the Masoni of Cagliari, for his presenta­ stakes is the Joint Institute for Nu­ planet's largest electromagnet. tion on a high statistics study of iota clear Research, Dubna, near Mos­ While eclipsed by the new genera­ decay with the Obelix spectrometer. cow, established in 1956. While tion of strong focusing machines, the This Prize, funded by the Jozef CERN's goal was to provide a Synchrophasotron enjoyed a new Stefan Institute, Ljubljana, is in physics platform on which to rebuild lease of life as a heavy ion machine memory of Niklaus Hamann, PS Western European science after (up to silicon-28), as well as provid­ coordinator and LEAR physicist who World War II, JINR had a similar ing polarized deuteron beams. The died last year, aged 40. mission for the USSR and the social­ machine currently runs for some ist countries, including Eastern 1,500 hours per year, providing Europe. research material for more than 500 The fact that both organizations are scientists from 100 institutions. reaching their 40th anniversary The next energy step had very testifies to their success. While their different scenarios at CERN and at aims were very similar, their political JINR. In in the early 1970s, CERN contexts and scientific strategies decided to build the '300 GeV have led along very different routes.
    [Show full text]
  • Thirty Years of Erice on the Brane1
    IMPERIAL-TP-2018-MJD-03 Thirty years of Erice on the brane1 M. J. Duff Institute for Quantum Science and Engineering and Hagler Institute for Advanced Study, Texas A&M University, College Station, TX, 77840, USA & Theoretical Physics, Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom & Mathematical Institute, Andrew Wiles Building, University of Oxford, Oxford OX2 6GG, United Kingdom Abstract After initially meeting with fierce resistance, branes, p-dimensional extended objects which go beyond particles (p = 0) and strings (p = 1), now occupy centre stage in the- oretical physics as microscopic components of M-theory, as the seeds of the AdS/CFT correspondence, as a branch of particle phenomenology, as the higher-dimensional pro- arXiv:1812.11658v2 [hep-th] 16 Jun 2019 genitors of black holes and, via the brane-world, as entire universes in their own right. Notwithstanding this early opposition, Nino Zichichi invited me to to talk about su- permembranes and eleven dimensions at the 1987 School on Subnuclear Physics and has continued to keep Erice on the brane ever since. Here I provide a distillation of my Erice brane lectures and some personal recollections. 1Based on lectures at the International Schools of Subnuclear Physics 1987-2017 and the International Symposium 60 Years of Subnuclear Physics at Bologna, University of Bologna, November 2018. Contents 1 Introduction 5 1.1 Geneva and Erice: a tale of two cities . 5 1.2 Co-authors . 9 1.3 Nomenclature . 9 2 1987 Not the Standard Superstring Review 10 2.1 Vacuum degeneracy and the multiverse . 11 2.2 Supermembranes .
    [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]
  • 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.
    [Show full text]
  • CERN Courier April 2014 Viewpoint Cividec Instrumentation
    CERN Courier April 2014 Viewpoint cividec Instrumentation CIVIDEC Instrumentation is a R&D company born from the cutting-edge technology of CERN. We specialise in turn-key The 1980s: spurring collaboration solutions for beam diagnostics based on CVD diamond technology. Herwig Schopper recalls a transferred to new assignments. Another element of “anti-growth” had decade of growth at CERN. long-term consequences. Council was Diamond Detectors convinced that the scientifi c programme was fi rst class, but had doubts about the effi ciency of management. An evaluation committee The 1980s were characterized was established to assess the human and by two outstanding material resources, with a view to reducing achievements that were to the CERN budget. In the end, the committee infl uence the long-term declined to consider a lower material future of CERN. First came the discovery budget because this would undoubtedly of the W and Z particles, the carriers of the jeopardize the excellent scientifi c record of weak force, produced in proton–antiproton Herwig Schopper in 1982: with LEP a “new CERN. They proposed instead a reduction collisions at the Super Proton Synchrotron ‘sociology’ for international scientifi c of staff from about 3500 to 2500, through (SPS) and detected by the UA1 and UA2 co-operation was born”. (Image credit: an early retirement programme, and during experiments. These were the fi rst, now-typical CERN-PHOTO-8205525.) the construction of the LHC this was even collider experiments, covering the full lowered to 2000. However, to cope with solid angle and requiring large groups the time with Israel and Turkey failed, for the increasing tasks and the rising number of collaborators from many countries.
    [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]
  • STANFORD (SLAC) Asymmetry Parameter Using a Dictate Where This Quark Can Sit If the Polarized Electron Beam Is a Straight­ Standard Model Is to Survive Intact
    Physics monitor The SLD determination of the confirmed, consistency arguments STANFORD (SLAC) asymmetry parameter using a dictate where this quark can sit if the polarized electron beam is a straight­ Standard Model is to survive intact. Precision electroweak forward measurement whose errors Using LEP data alone, the top mass result are still dominated by counting is 165 ± 22 GeV, while a global fit to statistics. The systematic error in this all world data yields 178 + 9 + 17-20 measurement (which has dropped to GeV. Precision testing of the electroweak 1.7% from 3.6% in 1992) is due Excitement is high as the next sector of the Standard Model has mainly to the uncertainties in measur­ round of SLD experiments begins intensified with the recent publica­ ing the SLC polarization using a this June. With at least 100,000 tion* of results from the SLD collabo­ Compton polarimeter, situated close events expected and a beam polari­ ration's 1993 run on the Stanford to the SLC interaction point. zation of about 75 percent, the error Linear Collider, SLC. Using a highly But the 1993 SLD run was not on the final result should be halved. polarized electron beam colliding with without its surprises. Testing the spin With LEP precision improving too, an unpolarized positron beam, SLD transport through the SLC arc to the next year will certainly be inter­ physicists measured the left-right evaluate an expected chromatic esting for electroweak physics. asymmetry at the Z boson resonance effect on the polarization measure­ * K. Abe et al, SLAC-PUB-6456 (April with dramatically improved accuracy ment, an SLD group was confronted 1994), submitted to Physical Review over 1992.
    [Show full text]