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Test results and status on T0 T0: start counter for pp collisions ShinIchi Esumi Inst. of Physics, Univ. of Tsukuba test experiment at KEK-PS analysis.

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Presentation on theme: "Test results and status on T0 T0: start counter for pp collisions ShinIchi Esumi Inst. of Physics, Univ. of Tsukuba test experiment at KEK-PS analysis."— Presentation transcript:

1 Test results and status on T0 T0: start counter for pp collisions ShinIchi Esumi Inst. of Physics, Univ. of Tsukuba test experiment at KEK-PS analysis results and simulations photon conversion rejection Summary, open questions and plan

2 Proposed T0 in PHENIX TOF T0 Hiroshi Tsuruoka, Masaya Ono

3 Test experiment at KEK-PS 2GeV/c pi- beam start1 start2 veto define1 define2 conv. rej. T0 B-field Fine mesh PMT: Hamamatsu 2inch R5924 time resolution position dep. thickness dep. width dep. light guide B-field dep.

4

5 Time resolution TDC ADC Slewing correction ST1-ST2 ST1-T0ST2-T0 T0: 59ps ST1: 39ps ST2: 31ps (T0R-T0L)/2 beam width (def. size) : 1[cm]/15[cm/ns]/sqrt(12) ~ 20ps  (T0) ~ 59ps Yoshiaki Kuroki, Masaya Ono

6 HV/position dependence Masaya Ono, Hiroshi Tsuruoka

7 Thickness/width/light guide dependence Masaya Ono, Hiroshi Tsuruoka

8 B-field dependence Masaya Ono, Hiroshi Tsuruoka

9 Simulation momentum resolution momentum (GeV/c)  (dP/P) with GEANT/pisa + reconstruction with T0 without T0 no mult. scatt. T0 (thickness :1.5cm) Akio Kiyomichi, Miwako Suzuki, Ayako Danmura

10 Photon conversion rejector thin scintillator in front of T0 to reject photon conversion at T0 high efficiency and low BG  eee  T0 DC/PC RICH TEC/TOF PCR

11 Test setup π － （２ GeV/c ） PMT Plastic Scintillator (BC 404,BC408) pedestal 13 photons WLS-fiber （ BCF-92 ） Ayako Danmura

12 Comparison with simulation dEdx from GEANT from experiment Poisson statistics count efficiency with Npe threshold 0.0 0.2 0.4 1 Ayako Danmura

13 Signal/noise for  to ee Thickness (cm) Thickness (cm) Ayako Danmura Signal NoiseS 2 /N S 2 /(2N+S)N’=N/10N’=N/100

14 Hiroshi Tsuruoka Mechanical design

15 Summary Time resolution about 60ps It does not depend on position nor B-field Fine mesh 2inch PMT (R5924) x25 ordered 1.5x8x100(cm 3 ) and 10cm light guide x8 slats Readout electronics (8ch x 3) from BBC Photon conversion rejector option? (read-out) Removable T0 only for hadron PID run? Open questions

16 fine mesh 2inch PMT (R5924) x25 ordered PMT delivery scintillator and light guide order mechanical structure design and order shipping all the materials to BNL assembly installation after heavy ion run one week access to complete Schedule 2001.1 2001.3 2001.4 2001.6 2001.8

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