Minutes of E362 weekly meeting At KEK R307, February 23, 18:00-21:00 Present: Nishikawa (Chairman), Chikamatsu (INS), Nakamura, Ohyama, Sakuda (KEK), Kohama (Kobe), Nakamura (Niigata) (1) Nakamura (Niigata) reports his Monte Carlo study for nu_e/nu_mu measurement (->Appearance mode). The VENUS program is used to simulate the hadron response for the lead-glass counters. Nakamura (Appearance mode), Etou (Fiber design) and Kohama (Horn monitor) will give a talk at JPS Kanazawa meeting on March 31. (2) Chikamatsu summarizes the simulation for the front detector (Disappearance mode). He estimates the performance for SCIFI detector of sigma-x=0.5mm (=defaullt) and sigma-x=5mm (=Scinti/WLS Stony Brook type). QE/(QE+Inelastic), vertex resolution and fiducial volume resolution for each case are shown. (3) About 240 modules (10cmx30cmx5m) of muon chambers are dismounted. Another 2 weeks to take the remaining 240 modules. From April we will disassemble 400 modules (10cmx30cmx7.6m). Shifts are done by members around KEK/INS. /Sakuda (4) Ishii (INS) will set up the test system for the muon chambers. (5) Nakamura (Nagoya) proposes to set up a similar fiber-winding machine at KEK to the one they have at Nagoya. Sakuda orders a new mandrel (1.34m diameter). We must find a room in which we build such machine at KEK. (6) Nakamura (KEK) wants us to study an important NC trigger since the accelerator group may come up with the resonant extraction scheme (extraction time= several hundred micro-seconds). Nishikawa wants to replace water target by scintillators to accomodate a NC trigger in such case. Tamura (Okayama) last week reported the estimation of the Cherenkov light yield from 2 cm thick water/WLS. This scheme may solve the problem if it works. Ohyama will also study a small Cherenkov detector design. (7) We will build a proto-type SCIFI detector with 0.7mmD single-clad fibers. However, a multi-clad fiber gives 50% more ligh yield than a single-clad fiber. Single-clad fibers with various dopant concentrations may change the attenuation length slightly. We will test these small samples and obtain the best fiber within this year. (8) Next week, the light yield measurement for scintillator/WLS must be done. This weekend, water coolong test for aluminum bar will be done. Chang Kee (Stony Brook) will visit KEK on March 1 and 2 to discuss on the scintillator- WLS detector. March 1, 15:00 E362 Collaboration meeting. ----------------------------------------- E362 weekly meeting At KEK, February 16, 18:00-20:00 Present: Nishikawa, Ishii, Chikamatsu (INS), Ohyama, Sakuda (KEK), Kohama (kobe), Nishijima, Etou (Tokai), Tamura (Okayama/Niigata) (1) Nishikawa shows the schedule for the E362 experiment from 1996-1999. Sakuda shows the schedule for each component of the fine-grain detector. (2) Etou improves the photo-electron estimation for the fibers. He took into account the effects of the fiber round shape and Landau tail. (3) Tamura studies a possibility of detecting the Cherenkov light from 2-4cm thick water using wave-length shifters. (4) Ishii estimates the muon energy resolution using the range method. He confirmed the results previously obtained by A.Suzuki (Kobe). He also estimates the muon energy resolution using the dipole magnet (4mx4m aperture, 1Tesla) and obtains a worse performance than the range method. (Memo by Sakuda) ----Distributed to -------- KEKVAX::NISHIKAW, KEKVAX::CHIKAMAT, kekux::"miyamoto@ieux01.ins.u-tokyo.ac.jp", kekvax::kenzo, KEKVAX::SAKUDA, kekvax::kanzaki, KEKVAX::OYAMAY, shirai, KEKVAX::SOSAMU, KEKVAX::MINORU, KEKPSA::ieiri, KEKUX::"miyano@ngthep.hep.sc.niigata-u.ac.jp", kekvax::tamuran, KEKUX::"SOBEL@MASTER.PS.UCI.EDU", kekvax::gajewski, kekux::"chiaki@sbhep.physics.sunysb.edu", kekvax::suzukia, kekux::"totsuka@jpnutins.bitnet", kekux::"suzuki@icrkm4.icrr.u-tokyo.ac.jp", kekux::"koshio@icrr.u-tokyo.ac.jp", kekux::"masato@icrkm4.icrr.u-tokyo.ac.jp", kekux::"itow@suketto.icrr.u-tokyo.ac.jp", kekux::"sakai@icrr.u-tokyo.ac.jp", kekux::"kajita@icrr.u-tokyo.ac.jp", kekux::"nakahata@icrr.u-tokyo.ac.jp", kekux::"koshio@icrr.u-tokyo.ac.jp", kekux::"inoue@icrkm4.icrr.u-tokyo.ac.jp", kekux::"kaneyuki@phys.titech.ac.jp", kekux::"thara@kobe-u.ac.jp", kekux::"aoki@kobe-u.ac.jp", KEKUX::"SUZUKI@PHYS01.PHYS.KOBE-U.AC.JP", KEKVAX::NIWA, kekvax::asai, kekvax::miuram, kekvax::kohama, kekux::"kyosi@tkikam.sp.u-tokai.ac.jp", kekux::"masayuki@tkikam.sp.u-tokai.ac.jp", kekux::"alpinist@sbhep.physics.sunysb.edu", kekux::"jimhill@sksol1.physics.sunysb.edu" --------------------------