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Test results and status on T0

This article provides an analysis of the test experiment at KEK-PS, including results, simulations, and photon conversion rejection. It also discusses the proposed T0 in PHENIX, with a focus on start counters for pp collisions. The article concludes with open questions and a plan for T0.

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Test results and status on T0

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  1. Test results and status on T0 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 T0: start counter for pp collisions

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

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

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

  5. HV/position dependence Masaya Ono, Hiroshi Tsuruoka

  6. Thickness/width/light guide dependence Masaya Ono, Hiroshi Tsuruoka

  7. B-field dependence Masaya Ono, Hiroshi Tsuruoka

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

  9. Photon conversion rejector p e e e TEC/TOF • thin scintillator in front of T0 • to reject photon conversion at T0 • high efficiency and low BG RICH DC/PC T0 PCR g

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

  11. Comparison with simulation dEdx from GEANT <Npe> from experiment Poisson statistics count efficiency with Npe threshold 1 0.0 0.2 0.4 Ayako Danmura

  12. Signal/noise for F to ee Noise S2/N Signal Thickness (cm) S2/(2N+S) N’=N/10 N’=N/100 Thickness (cm) Ayako Danmura

  13. Mechanical design Hiroshi Tsuruoka

  14. Summary • Time resolution about 60ps • It does not depend on position nor B-field • Fine mesh 2inch PMT (R5924) x25 ordered • 1.5x8x100(cm3) and 10cm light guide x8 slats • Readout electronics (8ch x 3) from BBC Open questions • Photon conversion rejector option? (read-out) • Removable T0 only for hadron PID run?

  15. Schedule 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 2001.1 2001.3 2001.4 2001.6 2001.8

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