Message-Id: <200012310610.PAA26783@neutrino.kek.jp> Subject: Minutes of SciFi weekly meeting (00/Dec/25) Date: Sun, 31 Dec 2000 15:10:46 +0900 From: Makoto Sakuda <sakuda@neutrino.kek.jp> Minutes of SciFi weekly meeting (00/Dec/25) 1. Cosmic-ray data analysis After finishing LED/EL calibrations and optimizing HV and ADC thresholds, we took cosmic-ray data with 100microsec and 60microsec gate width during Dec.21-26. Ishida analysed the data and compared the performance. 1) Run0263/1206 Jun-00 configration (Previous set) 2) Run01204 HV/Threshold changed 3) Run1189 2) + MCP gate=60microsec We show (a) Tracks/Trigger : Fraction of traversing >15 layers out of Scint Triggered events (b) x, y hit Efficiency : Hits found along the track/Expected hits (c) Extra hits/IIT/event : All hits - 1 (on the track) per event per IIT (a) tracks/trig (b) Hit efficiency (c)extra hits Config. x y 1) Old 0.094+-0.003 0.958(+-0.001) 0.963 1.81 2) New 0.102+-0.003 0.962 0.971 1.93 3) New 0.103+-0.003 0.950 0.962 1.41 +60microsec We observe that the new configration 2) is best. MCP gate width is 100microsec (same as before) by the following reasons: From (a), we find 9(+-4)% more tracks with 2) than the previous configration 1); From (b), we see higher efficiency for 2) than 3). **We stay with 100microsec gate width. MCP HV and threshold have been adjusted better.** Ishida also finds that by changing the hit condition, we will have 1% better efficiency than 2). Ishida and Iwashita will improve the efficiency further by optimizing hit conditions. We have 6, 8 p.e. data, but no 1 p.e. data. We will take 1 p.e. data next year for Pixel simulation. HVs were turned off on December 29, 17:00. They will be ON on Jan.4 or 5. 2. K2K PRL paper ("First Detection of Accelerator-Produced Neutrinos...") Comments should be sent to paper committee by January 4, 2001. 3. Tracking performance paper (NIM) --- BJ.Kim/Park We are still discussion over the 0-th draft. *Ishida work on Section3 (hit reconstruction). *BJK add figures showing improvement on alignment starting from survey. *Sakuda add Section 5 (Neutrino event reconstruction) similar to the previous NIM paper. Let's meet on January 9 (Tues) via Video, at 8:30am (JST), to discuss over Calibration/Monte Carlo generation and analysis. Please tell me your schedule (BU,UW,SUNY,SNU,Kobe etc). //
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