On Japan Linear Collider (JLC)
Total Page:16
File Type:pdf, Size:1020Kb
JZ&*, KEK-PROC—92-13 Proceedings JP9307252 of the Third Workshop on Japan Linear Collider (JLC) KEK, Febrary 18 - 20, 1992 Positrons 10 GeV 1.54 GeV S-band S-band Pre-Accelerator Injector 500 GeV 10-30 GeV X-band Linac S-band Linac for Positron Generation 1.54 GeV Positron Damping Ring NATIONAL LABORATORY FOR HIGH ENERGY PHYSICS, KEK KEK Proceedings 92-13 December 1992 A/H/D Proceedings of the Third Workshop on Japan Linear Collider (JLC) KEK, Febrary 18 - 20, 1992 Editor: A. Miyamoto t- f \ I National Laboratory Tor High Energy Physics, 1992 KEK Reports are available from: Technical Information & Library National Laboratory for High Energy Physics 1-1 Oho, Tsukuba-shi Ibaraki-ken, 305 JAPAN Phone: 0298-64-1171 Telex: 3652-534 (Domestic) (0)3652-534 (International) Fax: 0298-64-4604 Cable: KEKOHO £* t J Proceedings of the Third Workshop on Japan Linear Collider (JLC) Contents , Accelerator Present Status of Accelerator R&D for the JLC K. Takata 1 Possible Change of JLC Parameters K. Yokoya 7 Positron Source for the JLC H.Ida 12 Thermionic Gun for JLC and ATF T. Naito 20 3-D Simulation for Linac Design S. Yamaguchi 26 Detuned Structure for JLC M. Yamamoto 34 Damped Structure for Main Linac T. Taniuchi 42 1.54 GeV Damping Ring of ATF S. Kuroda 50 Vacuum System for ATF Damping Ring N. Terunuma 57 Kicker Magnet System for JLC H. Nakayama 65 Energy Compensation in the Bunch Compressor M. Kikuchi 69 Multibunch Instabilities in ATF Damping Ring K. Kubo 79 Development of Highly Polarized Electron Source T. Nakanishi 91 Laser-Compton Spot Size Monitor T. Shintake 107 Beam Polarization Monitor by Laser-Compton Scattering T. Omori 121 Final Focus System K. Oide 143 Ground Motion at KEK N. Yamamoto 148 A Precision Table for Final Lenses of FFTB N. Ishihara 150 Measurement of Transverse Displacement for Long Path Length K. Miyashita 160 II. Physics Unambiguous Test of Non-Decoupling Top Corrections Z. Hioki 169 Physics near the tt Threshold at Future e+e~ Colliders Y. Sumino 173 Radiative Corrections to the Top Quark Decay T. Kuruma 197 Higgs Sector in SUSY Models Y. Okada 204 Probing the Higgs Sector of the Minimal Supersymmetric Standard Model at e+e~ Colliders A. Yamada 214 Top Decay in Minimal Supersymmetric Model K. Hidaka 232 Supersymmetric Panicle Production at TeV ey Colliders T.Kon 247 Radiative Correction to e+e- -» W+W~ J. Saito 253 QCD Corrections to the Higgs Boson Decay into Two Photons M. Inoue 259 Evaluating Cross Sections at TeV Energy Scale by HELAS I. Watanabe 265 Weak Gauge Boson Scattering R. Najima 284 JLC Standard Event Generator Y. Kurihara 290 Intermediate Mass Higgs Search at 300 GeV e+e~ Colliders J. Kanzaki 297 SUSY Higgs with JLC-I K. Kawagoe 301 Dependence of Properties of SUSY Particles on the Minimal SUSY Model Parameters T. Tsukamoto 330 III. Detectors Vertex Detector Y. Sugimoio 343 Background Effect on Drift Chamber A. Sugiyama 349 Calorimeter Study Status Report Y. Fujii 355 A Conceptual Design of the Large Solenoid Magnet for JLC Experiment T. Matsui 362 e* pair Background and Masking System for JLC T. Tauchi 368 Estimation of Beam Induced Muon Background Y. Namito 382 Minijet Background at JLC A. Miyamoto 389 Proposal for JLC-300 S.Orito 400 Feb. 18(Tue)-20(Thu), 1992 at Seminar Hall (3rd building), KEK Program Feb. 18 , I992(Tue) Chairman : S. Onto 9:00 - 9:10 Opening Address H.Sugahara(KEK) 9:10- 9:40 The JLC Project and ATF K.Takata(KEK) 9:40 - 10:10 Physics Imoroduction M. Kobayashi(KEK) Coffee Break - Chairman: K. Hikasa 10:30 10:45 Unambiguous Test of Non-decoupling Top Corrections Z. HiokifTokushima) 10:45 11:35 Physics at the ttbar Threshold Region Y. Sumino(Tokyo) 11:35 12:00 Radiative Corrections to the Top Quark Decay T. Kuruma(Tokyo) — Lunch Chairman :K. Hagiwara 13:00 13:20 Particle Spectrum in Supergravity Model M. Nojiri(KEK) 13:20 13:40 Higgs Sector in SUSY Models Y. OkadafTohoku) 13:40 14:00 Probing the Higgs Sector of MSSM at e+e- Colliders A. YamadafTokyo) 14:00 14:15 Top Decay in the Minimal Supersymmetric Model K.Hidaka(Gakugei) 14:15 14:30 Supersymmetric Particle Production at TeV ey Production T. Kon(Seikei) 14:30 15:00 WWV/WWW Coupling S. IshiharafTokyo) Coffee Break Chairman: C. -S. Lim 15:30 16:15 Evaluating the Cross Sections at TeV Energy Scale by HELAS I. Watanabe(Hiroshima) 16:15 16:45 Weak Gauge Boson Scattering R. Najima(Yokohama) 16:45 17:00 Radiative Correction to e+e- --> WW J. Saitou(Suzumine) 17:00 17:15 QCD Correction to H -->YY M. Inoue(Kaijou Hoan) 18:00- Get Together Party at Restaurant ZEN Feb. 19, 1992(Wed) Chairman: M. Yoshioka 9:00 - 9:20 Positron sources H. Ida(NKK) 9:20 - 9:40 Thermionic Gun T. Naito(KEK) 9:40 - 10:00 3D Simulation for Linac Design S. Yamaguchi(KEK) (~Y\ffpp Rrpat - Chairman : M. Oyamada 10:20 - 10:40 RFGun H. Akiyama(Soukendai) 10:40 - 11 :(X) Detuned Structure of X Band Linac M. YEmamoto(Soukendai) 11:00 - 11:20 Damped Structure of X Band Linac T. Taniuchi(Touhoku) 11:20 - 11:50 Parameters of JLC K.Yokoya(KEK) Lunch Chairman : M. Nozaki 13:00 - 13:45 Summary of the Simulation Study of SM Physics Y. Kurihara(KEK) 13:45 - 13:55 Simulation Study of the Search for Higgs J.Kanzaki(KEK) 13:55 14:10 Study of Search for MSSM Higgs Bosons K. Kawagoe(Tokyo) 14:10 - 15:00 Simulation Study of SUSY Panicle Searches T. Tsukamoto(KEK) Chairman : S. Kawabata 15:20 15:40 Final Focus and Alignment Toleranc.-s K.Oide(KEK) 15:40 16:10 Interaction Region T. Tauchi(KEK) Ur.U) 16:30 Estimation of Beam Induced Muon Background Rate Y. Namito(KEK) 16:30 16:50 Mini-jet Background A. Miyamoto(KEK) 16:50 17:10 Precision Table for Final Lenses of FFTB N.Ishihara(KEK) 17:10 17:30 Measurement of Transverse Displacement for Long Path Length A. Miyashita(Naruto) eb.20 , 1992(Thu) Chairman J. Urakawa 9:00 - 9:20 1.54GeV Damping Ring of ATF S.Kuroda(KEK) 9:20 - 9:40 Vacuum System of ATF Damping Ring N. Terunuma(KEK) 9:40 - 10:(X) Double Kicker System of ATF H. Nakayama(KEK) 10:00 - 10:20 Bunch Compressor of ATF M Kikuchi(KEK) Pnffpp Rrpak - Chairman S. Takeda 10:40 - 11:00 1.54GeV S-band Injector Linac for Damping Ring H.Matsumoto(KEK) 11:00- 11:30 Multibunch Instability in Damping Ring K. Kubo(KEK) 11:30 - 12:00 Instrumentation and Beam Monitors for JLC and ATF H.Hayano(KEK) Lunch Chairman : S. Suzuki 13:00- 13:30 Polarized Electron Sources T. Nakanishi(Nagoya) 13:30- 14:00 Nanometer Beam Size Monitor by Laser Compton Scattering T. Shintake(KEK) 13:00- 14:20 Beam Polarization Monitor T. Omori(KEK) 14:20- 14:40 Solenoid Magnet T. Matsui(KEK) Pnffpp RrpaW Chairman : T. Matsui 15:00 - 15:20 Vertex Detector Y. Sugimoto(KEK) 15:20- 15:50 Tracking Detectors A. Sugiyama(Nagoya) 15:50- 16:20 Calorimetry Y. Fujii(KEK) 16:20- 16:40 Future Perspective Y. Kimura(KEK) 16:40- 17:30 Discussion I. Accelerator i i Present Status of Accelerator R&D for the .ILC Koji Takata KEK This is an overview of progress in accelerator R&D work, as of February 1992, for the JLC. Details of our work may fall into three categories: (1) parameter optimization, (2) separate R&D works, most of which are experimental and are being carried on rather independently from each other, (3) promotion of the ATF(accelerator test facility) project with emphasis put on design and construction of a test damping ring. Parameter Optimization The parameters for the center-of-mass energy 1 TeV are listed in the table below. They are basically the same as old ones, although many detailed modifications have been made according to progress in simulation studies and hardware developments. The key parameter would be the X-band RF frequency chosen at 11.424 GHz from the beginning. Technologies of high power klystrons at such a high frequency are quite new to us and a lot of hard R&D work should be carried out to practically use thousands of such tubes in a linear collider. If we limit the center of mass energies to about 500 GeV or lower, however, we may choose a lower RF frequency where the RF source technology is far easier. This option might be attractive if we have to construct a linear collider very soon. Such a possibility is, however, not certain enough at present. Therefore R&D work for the RF source shall be still restricted to 11.424GHz. In fact X-band klystron and structure studies are halfway and require at least a few more years for us to get convincing results. Any action which impedes activities in this direction would be unfavorable, possibly making many of the achieved results useless, under present circumstances of the unripe technological status. Furthermore the total AC power would surely become impracticably large if the energy has to be raised eventually to 1 TeV. 1 Various R&D Studies The separately going R&D studies consist of the following programs: (1) electron /positron sources. (2) X-band klystrons, (3) X-band structures, (4) final focus optics design and hardwares, (5) design of the interaction region. The elecironlposiiron sources We have achieved noticeable advances in the development of polarized electron sources and RF gun.