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Cerft COURIER INTERNATIONAL JOURNAL of HIGH ENERGY PHYSICS CERft COURIER INTERNATIONAL JOURNAL OF HIGH ENERGY PHYSICS VOLUME 35 The DRYTEL Series Oil free pumping systems from atmosphere to 109 mbar The Drytel Series provides a clean vacuum down to 10 6or 10 9 mbar range. Completely self contained, single switch operation, the Drytel Series provides dry, compact systems for use anywhere clean vacuum is required. Available in bench top, compact Micro versions or customer specified configurations to better fit applications like calibration benches, surface analysis, mass spectrometry, electron microscopy, and any process that call for clean evacuation. Ceramic bearings are used in all Alcatel molecular pumps. • Alcatel CIT Vacuum Technology Division - 98, avenue de Brogny - BP 2069 - 74009 ANNECY - FRANCE Tel: (33) 50 65 77 77 - Fax: (33) 50 65 77 89 USA United Kingdom Germany Italy Japan Alcatel Vacuum Products Alcatel Vacuum Technology UK Ltd Alcatel Hochvakuumtechnik GmbH Alcatel Vacuum Systems SpA Alcatel ITS Tel : (1)617 331 4200 Tel : (44)494 44 84 44 Tel : (49) 9342 96 100 Tel : (39)2 33 00 80 13 Tel : (81) 354 24 14 14 ISSN 0304-288X Advertising enquiries Europe Volume 35 No. 1 Micheline Falciola January/February Covering current developments in high energy Advertising Manager 1 CERN 995 physics and related fields worldwide CH-1211 Geneva 23, Switzerland Editor: Gordon Fraser (COURIER @ CERNVM)* Tel.: +41 (22) 767 4103 Production and Advertisements: Fax: +41 (22) 782 1906 Micheline Falciola (FAL @ CERNVM)* Advisory Board: E.J.N. Wilson (Chairman), E. Lillestol, Rest of the world H. Satz, D. Treille; with L. Foa, Laurie Daddona E.M. Rimmer Advertising Manager, USA *(Full electronic mail address... @ CERNVM. CERN. CH) Gordon and Breach Publishers 820 Town Center Drive LANGHORNE PA 19047 Tel.: (215) 750-2642 The ultimate birthday present Fax: (215) 750-6343 Approval for CERN's LHC machine Distributed to Member State governments, institutes and laboratories affilliated with CERN, and to their personnel. Around the Laboratories General distribution CERN: Another leap at LEP Improved electron-positron performance Jacques Dallemagne CERN, 1211 Geneva 23, Switzerland DESY: Luminous 1994 In certain countries, to request copies or to 8 Improved electron-proton performance make address changes contact : DARMSTADT: Heaviest of them ail China 8 Elements 110 and 111 synthesized Dr. Qian Ke-Qin Institute of High Energy Physics BEIJING: Green light for feasibility studies on tau-charm factory P.O. Box 918, Beijing, 10 Looking at new Chinese machine People's Republic of China TRIUMF: Technology transfer Germany 11 Canadian industrial spinoff Monika Stuckenberg or Kerstin Techritz DESY, Notkestr. 85, 22603 Hamburg 52 INDIA: Photon multiplicity detector 14 Module for heavy ion physics Italy Mrs. Pieri or Mrs. Montanari ] 5 COMPUTER OPERATING SYSTEMS: HEPiX news INFN, Casella Postale 56 00044 Frascati, Roma Physics monitor United Kingdom *| Q Muon colliders Su Lockley Rutherford Appleton Laboratory, *| Q Cosmic rays of the highest energies Chilton, Didcot, Oxfordshire 0X11 0QX USA/Canada "I Q Antiprotonic heating of nuclei Cyndi Rathbun 20 DESY: Theory workshop looks at supersymmetry (cyndi [email protected]) Fermilab, P.O. Box 500, Batavia Illinois 60510 24 Books received CERN COURIER is published monthly except January and August in English and, 23 People and things French editions. The views expressed in the Journal are not necessarily those of the CERN management. Printed by: Drukkerij Lannoo nv 8700 Tielt, Belgium Published by: European Laboratory for Particle Physics CERN, 1211 Geneva 23, Switzerland tel.: +41 (22)767 61 11, telex: 419 000 CERN CH, telefax: +41 (22) 767 65 55 CERN COURIER only: Cover photograph: How the world's highest energies look. At the end of 1994, tel. +41 (22) 767 41 03, CERN supplied lead nuclei, accelerated to about 160 GeVper nucléon, represent­ ing over 30 TeV of beam energy for each nucleus, to a range of experiments. telefax+41 (22) 782 19 06 This shows what happens when lead meets lead in the Time Projection Chamber USA: Controlled Circulation of the NA49 experiment. With the quest to recreate the quark-gluon plasma which permeated the early hot Universe, definitive results from all these experiments are Second class postage paid at Batavia, Illinois eagerly awaited. 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