People and things

next conference. Substantial pro­ Special seminars organized by On people gress could be announced in the de­ CERN's Theory Division recently velopment of superconducting cavi­ marked milestone birthdays for ties, where 5 MV/m accelerating Rolf Hagedorn (65), and Léon Van gradients can now be achieved relia­ New President of the European Hove (60). bly in multi-cavity systems from Physical Society is Godfrey Staf­ 300 MHz to 3 GHz. Specialists have ford, Master of St. Cross College, Alan Schriesheim, senior deputy learned how to control the thermal Oxford, former Director General director and chief operating officer stability and to find and to remove of the Rutherford and Appleton of Argonne National Laboratory defects on the surface, so that the Laboratories, UK, and for several becomes Director, succeeding electron field emission limit may be years Chairman of the CERN Scien­ Walter E. Massey. the next barrier that will have to be tific Policy Committee. considered. There was a great deal of work A correction to the US National presented on electron linacs, high European Physical Society Lecturer Synchrotron Light Source story current and continuous wave accel­ this year was Paul Matthews, now published in our May issue, page erators. In the theoretical field, the at Cambridge. Well known in the 156. John McTague is no longer understanding of beam cavity inter­ particle physics community for his NSLS head. After McTague s actions and high current beam trans­ numerous original theoretical con­ departure to Washington to port were the centre of discussion. tributions, and renowned for his become deputy to Office of Finally there was the traditional cov­ skills as a lecturer, he presented Science and Technology Policy erage of ongoing projects, where the talks on electroweak interactions Director George Keyworth, BNL somewhat specialized linac field op­ and on stellar evolution to student Associate Director Marty Blume ens out to the vast accelerator land­ audiences in Switzerland, West took over NSLS as Acting scape. Unfortunately the partici­ Germany and the Netherlands. Chairman. pants from Novosibirsk (V.E. Bala- kin, A.N. Skrinsky) could not join the conference and their announced con­ tribution on the VLEPP project—a li­ near collider scheme—had to be can­ celled, so that the report on the SLAC Single Pass Collider (by G.A. Loew) enriched by some ideas on future linear colliders was the only communication on this historical step in linear accelerator physics. The suggested site for the next Con­ ference (1986) is Stanford.

From Heinz Frange

The Mark II detector is eased out of its position in the PEP electron-positron ring at Stanford prior to upgrading for eventual running at the SLC Stanford Linear Collider now under construction. The detector will receive a new central drift chamber. Before operating in SLC, the revamped Mark II will be put through its paces in the PEP ring.

(Photo SLAC)

242 CERN Courier, July/August 1984 The spectacular firework display seen in a gang Paul on forty years of accel­ Intermediate energy future streamer chamber at the Berkeley Bevalac erator history in Europe. by a GSI (Darmstadt) / Berkeley team studying heavy ion (here an argon-40 beam) With proton machines at many Important topics covered at the collisions. This work gives valuable clues major Laboratories being increas­ workshop included: Kaon and Hy- to the properties of compressed nuclear peron Physics; Physics with Anti- matter, also of interest to astrophysicists. ingly used as injectors for larger machines, the supply of interme­ protons and with polarized Pro­ tons; Elementary Hadronic Sys­ Stiff nuclear matter diate energy beams for both parti­ cle and nuclear physics experi­ tems in the Light of Quantum Chro- In our previous issue (page 196), ments could become tight. Recent­ modynamics; Rare and Ultra rare we described work by a joint GSI ly there has been a series of work­ Decays and Reactions; Electro- (Gesellschaft fur Schwerionenfor- shops looking at the prospects for weak Interactions and Neutrino schung, Darmstadt) / Berkeley intermediate energy physics (see, Physics; Nuclear Physics with team investigating the formation for example, June issue, page 194, Strangeness-Carrying Probes. of compressed nuclear matter in and March issue, page 56). The contributions of some fifty heavy ion collisions at the Berkeley Physics objectives and future speakers in the study groups gave Bevalac using the Plastic Ball / experimental facilities for particle an impressive overview of the Wall detector. Valuable information and nuclear physics at intermediate promising and rich spectrum of on collective nuclear matter has energies were discussed at a work­ this field of physics. These contri­ also come from another GSI / Ber­ shop held in Freiburg (West Ger­ butions included summaries of keley team working at the Bevalac, many) from 10-13 April. The work­ earlier workshops held in the US this time using a streamer chamber shop was organized by the Univer­ and in Canada (LAMPFII, TRIUMF to measure pion production in hea­ sity of Freiburg and by Projekttrâ- Kaon Factory, AGS II Brookhaven). vy ion collisions and infer the pro­ ger Mittelenergiephysik of the Fed­ Although electron and muon beam perties of the compressed nuclear eral German Ministry of Science facilities were also studied, the matter formed in the 10~23 sec­ and Technology. discussion of accelerator perspec­ onds following the collisions. Their During three days more than tives lead to the clear and rather studies suggest that such matter 200 invited participants from high unanimous conclusion that a rapid is relatively 'stiff', thus tying in energy and nuclear physics took cycling, high intensity proton with recent observations on neu­ part in lively discussions on future synchrotron at about 30 GeV tron stars, and forming another options in particle and nuclear phy­ would be best suited to meet the bridge between astrophysics and sics at low and intermediate ener­ needs of experimentalists. The high energy experiments. gies, grouped into six study success of the meeting made it evident that there is a broad com­ The streamer chamber is sched­ groups. In a plenary session on munity of potential users—far uled to come to CERN for experi­ the fourth day, discussion leaders beyond the German groups who ments using higher energy heavy reported on results, conclusions have a long and successful tradi­ ion beams produced in the 28 GeV and recommendations of their tion in this field of physics. 'proton' synchrotron (see July/Au­ study groups. The session ended gust 1983 issue, page 223). with a delightful lecture by Wolf­ (From F. Scheck)

CERN Courier, July/August 1984 243 This year, over 60 runners lined up at the start of the traditional annual relay race round the CERN site. It was won by the UA 1 'Monojet' team, recapturing the trophy they lost last year while their attentions were diverted by the discoveries of the W and Z particles.

(Photo CERN 472.5.84)

nomenon has been (and continues year UA 1 fielded no less than sev­ Cheer at LEAR to be) the subject of wide exper­ en teams, meriting some additional Judged by the bubbling enthusiasm imental interest (see March issue, award for mass participation. Not of its 260 users, the LEAR Low pages 62-4). The Annecy/Grenoble all the UA 1 teams could reproduce Energy Antiproton Ring at CERN team look for variations in the elec­ the form of the 'Monojets ', with continues to be a great success. tron neutrino signal between two the aptly named 'Missing Energy' First trials last year encountered different positions of their detector sextet finishing near the other end some teething troubles, and there and find a small range of neutrino of the spectrum of results. How­ were other factors which made variables where such an effect ever the real 'run' is scheduled to scheduling LEAR beam about as cannot be definitely ruled out. begin in September, when the SPS difficult as predicting the weather. Work is continuing with a view to proton-antiproton Collider comes However the machine has emerged confirming (or otherwise) this initial back into action. from its initial shakedown with indication. flying colours. During a successful run at 300 HERA meeting Aladdin has light MeV/c earlier this year, up to A meeting on experiments for the 100 000 antiprotons per second Electron beams have been taken HERA ring will be held in Italy from were focused to a spot as small to 800 MeV in the Aladdin storage 1-3 October. More information as 1 mm2. Recently LEAR delivered ring at the Synchrotron Radiation follows. a new 1.5 GeV/c beam in record Center, University of Wisconsin- time, providing experiments with Madison. Work is now concentrat­ more than 200 000 antiprotons ing on higher injection efficiencies per second in a fine beam less and overcoming beam instabilities. than a millimetre wide in one direc­ It is soon expected to be running tion and 1.5 mm in the other. reliably with beam intensities of These are just the conditions for 10 m A, and with the first beamline physics discoveries and more new for experiments in position. LEAR results are eagerly awaited.

How UA 1 won Oscillation hint The UA 1 'Monojets ' were first As mentioned briefly in our pre­ past the post in this year's tradi­ vious edition (page 196), the Anne­ tional 3.9 km relay race round the cy / Grenoble team working at the CERN site. Last year, with all the Bugey (France) reactor has seen panic about the W and Z particles, some indications for neutrino oscil­ the experiment's first team could lations. The search for this phe- only manage second place. This

244 CERN Courier, July/August 1984