Deep inelastic scattering HERA style. This violent electron-proton collision recorded in the H1 detector shows the new kinematic regime opened up by DESY's newly-commissioned collider. The scattered electron (furthest right track) is absorbed in the first part of the calorimeter, while the proton fragments into three well separated jets. The x-value (fraction of proton momentum carried by the struck quark) is 0.3, while 800 GeV2 of mass is exchanged, a hundred times larger than the values achieved in current fixed target experiments.
an internal target, such as a gas jet, mounted inside the AmPS ring. AmPS construction began in July 1989 and was completed this April, within budget and well on time. Commissioning began almost immediately, with first beam injected on 12 May. First beam was extracted to an experimental area on 5 June. Accelerating in Hamburg Attention then turned to storing the beam in the ring. Without radiofrequency power, synchrotron Hardly had Europe's accelerator HERA detectors switched on for radiation losses could be exploited to physicists returned and unpacked the first time in the full energy stretch the injected beam pulses, their bags from the third biennial beams (July, page 1). giving initial duty factors of about 5%, European Particle Accelerator In hardly a month's running the compared with the 0.02% figure of Conference held in Berlin at the HERA team had already chalked the linac itself, enough for an initial end of March (June, page 5), than up 40 'luminosity' runs averaging physics experiment. they were making more travel five hours apiece. The luminosity plans for Germany; this time to The NIKHEF-K project team for each crossing of the 10 elec• Hamburg to join colleagues from headed by Guy Luijckx has now tron and proton bunches was as all over the world for the fifteenth shown that the new machine is well yet a modest 10% of the design biennial International Conference and truly operational. Future work will value, but this was due to throt• on High Energy Accelerators concentrate on improving the duty tling back the proton injectors to (HEACC) from 20-24 July. factor and increasing beam energy avoid a beam instability which Germany, and Hamburg in and intensity. was thought more likely to have particular, has much to excite the its origin in a control loop in the interest of the accelerator world DESY III synchrotron rather than these days as DESY's new star - in any effect which was a funda• DUBNA the HERA electron-proton collider mental limitation to intensity. Heisenberg-Landau - begins to feed detectors for the first time, and at least two long The conference was suitably programme term schemes for the application impressed and wished HERA of linear collider technology good fortune as it moves out of its The Joint Institute for Nuclear emerge involving German starting blocks towards colliding Research (JINR), Dubna, near participants from DESY, the many more bunches needed Moscow, one of the most important Darmstadt, Karlsruhe and when running flat-out for physics. Wuppertal. centres of fundamental research in Germany's interest in linear colliders became clearly apparent the former Eastern Bloc, is naturally Pride of place at the Hamburg as, during a whole day devoted to looking to new horizons in meeting was rightly given to this subject, the many new international collaboration. HERA's latest achievements, with schemes and tests planned in this In 1991, informal discussions a status report from Ferdinand field were unfurled. These will be between representatives of JINR's Willeke. Laboratory for Theoretical Physics fully covered in the full HEACC and their counterparts from German Just several weeks earlier, a report to feature in next month's universities (Berlin, Bonn, proton beam at the full design issue. Heidelberg, Munich, Tubingen,....), energy of 820 GeV had been led to the establishment of a brought into collision with an 'Heisenberg-Landau' programme to electron beam of 26.6 GeV and E.J.N. Wilson foster scientific exchange between Dubna and German institutes.
CERN Courier, September 1992 31 Participants at a workshop in Dubna in May on QCD at finite temperature, bound states and nuclear dynamics, organized in the context of the new 'Heisenberg-Landau' programme to foster high energy physics, especially theory, collaboration between Dubna in Russia and German research institutes.
In this context an initial workshop on 'Quantum Chromodynamics at finite temperature, bound states and nuclear dynamics' at Dubna in May led to fruitful discussions and plans for closer future collaboration. The follow-up seminar in the new programme will be in November, organized by Dubna and Rostock. The Heisenberg-Landau scheme also sponsored a student summer school in Dubna in August on particle and nuclear physics.
People and things A special event at CERN on 9 July marked the 80th birthday of Willibald Jentschke (seated, right), DESY pioneer and CERN's Director General from 1971-75. Speakers paying Hungary becomes CERN's tribute included Victor Weisskopf (standing, 18th Member State CERN's Director General from 1961-5), and (seated, left to right) CERN's current Director General Carlo Rubbia and Director General from 1981-88 Herwig Schopper. At the meeting of CERN Council on (Photo CERN HI 8.7.92) 26 June, delegates of CERN's existing 17 Member States voted unanimously to admit the Republic of Hungary as the Organization's 18th Member State, with effect from 1 July. Following the dramatic political changes in Central and Eastern Europe over the past few years, CERN is leading the way towards a unified scientific Europe. Hungary thus joins Austria, Bel• gium, the Czech and Slovak Federal Republic, Denmark, Finland, France, Germany, Greece, Italy, the Nether• lands, Norway, Poland, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. Hungary has a well
32 CERN Courier, September 1992