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Contents PHENIX-TOF Basic Design Construction/Operation Performance Summary

Performance of High Resolution Time-of-Flight detector for Study of Identified Hadron Production at RHIC-PHENIX experiment. Univ.of Tsukuba: A.Kiyomichi , M.Aizawa, M.Ono, S.Kato, H.Sako, S.Sato, M.Suzuki, T.Chujo, H,Tsuruoka, Y.Miake and PHENIX Collaboration. Contents PHENIX-TOF

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Contents PHENIX-TOF Basic Design Construction/Operation Performance Summary

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  1. Performance of High Resolution Time-of-Flight detector for Study of Identified Hadron Productionat RHIC-PHENIX experiment Univ.of Tsukuba: A.Kiyomichi, M.Aizawa, M.Ono, S.Kato, H.Sako, S.Sato, M.Suzuki, T.Chujo, H,Tsuruoka, Y.Miake and PHENIX Collaboration Contents PHENIX-TOF Basic Design Construction/Operation Performance Summary JPS meeting at Niigata University September 23, 2000

  2. PHENIX-TOFDevice for Hadron PID • 960 plastic scintillators with 1920 PMT’s • Locate at 5m from the vertex • Acceptance : driven by HBT and f meson • Dq = 40o, Dj = 45o, W ~1/3 Sr Panel: 96 slats Slat: Plastic scintillator w. 2 PMT’s 385cm 200cm 200cm Akio Kiyomichi [Univ. of Tsukuba]

  3. Basic Design Scintillator: 1.5x1.5x64cm Timing Pulse Height PMT • Scintillator: Bicron BC404 • decay constant : 1.8 ns • attenuation length : 160cm • PMT : Hamamatsu R3478S • rise time : 1.3 ns • transit time : 14 + - 0.36 ns • HV Bleeder with chip resisters 80 ps 1.3 cm Akio Kiyomichi [Univ. of Tsukuba]

  4. Structure (Lucite) • Honeycomb Board • Rigid structure with “no mass” Carbon Fiber Sheet Honeycomb Structure (Paper) Akio Kiyomichi [Univ. of Tsukuba]

  5. Block Diagram of FEE PMT QVC/ AMU 12bit ADC Shaper Format Buffer Leading Edge Discr. TVC/ AMU 12bit ADC DAC TOF-FEE • Custom made chips of TVC+AMU and QVC+AMU • Overall timing resolution of <25 ps • First pipeline TDC with high resolution. • Use of Analog memory Unit. TVC+AMU chip 4ch/chip PMT inputs lemo FEE board 16ch/board 8layers PC Discriminattor Sub-board Akio Kiyomichi [Univ. of Tsukuba]

  6. TOF Performance at CERN-WA98 • 5 panels of TOF tested at CERN-WA98. • Overall TOF resolution of < 85ps obtained. s ~ 85ps Time-of-Flight [ns] (1996) Used high momentum p TOF resolution for all 500 slats TOF PID Capability at RHIC-PHENIX Time Resolution: s ~ 85 ps p / K separation to 2.4 GeV/c K / p,`p separation to 4.0 GeV/c Akio Kiyomichi [Univ. of Tsukuba]

  7. Construction at Tsukuba (1996-1998) Akio Kiyomichi [Univ. of Tsukuba]

  8. PMT installation Cable Assemble Signal Check Construction at BNL (1998-1999) Akio Kiyomichi [Univ. of Tsukuba]

  9. All 10 panels were installed. Installation in PHENIX(August 1999) Akio Kiyomichi [Univ. of Tsukuba]

  10. First Collisions at PHENIX(6/15/2000) • The event display shows the fired slats of TOF • TOF occupancy is less than 10%. Occupancy 10% Number of TOF hits Akio Kiyomichi [Univ. of Tsukuba]

  11. Year-1 Operation: Zero-field RunTOF Calibration • Rough calibration parameters obtained. [~100ps level] • T0 value and Z-vertex information from BBC. • NO tracking information used yet. (To be done) • Timing offset, Position offset and Gain Correction y position offset Time offset Dt = 5 nsec ~ length of scinti. 64cm Calibration condition • BBC Z vertex (-40 < z < 40 cm) are required • L : straight path ( from z-vertex TOF hit • position with retracted geometry) • Including BBC Coins, ZDC coins, • BBC&ZDC trigger Akio Kiyomichi [Univ. of Tsukuba]

  12. Track matching and TOF intrinsic timing resolution • sTOF-TEC = 2cm: • Corresponding timing resolution is 120 ps. • Consistent with TOF intrinsic timing resolution of 120ps operated without slewing correction. sposition ~ 2cm sTIME ~ 120 ps TOF PC3 TEC Akio Kiyomichi [Univ. of Tsukuba]

  13. Particle Identification • We can see clear p,K,p separation • No slewing correction • No final timing adjustment Akio Kiyomichi [Univ. of Tsukuba]

  14. Summary • TOF is working in the first RHIC operating year. • TOF intrinsic timing resolution is 120 ps fromTEC/TOF matching without slewing correction. • TOF and Tracking chambers demonstrated clear separation of charged hadrons (p,K,p) at Au+Au sqrt(s) = 130 AGeV collision. Akio Kiyomichi [Univ. of Tsukuba]

  15. Spare TOF resolution • Select High-momentum pion. • Current Time of Flight resolution is ~170ps. • BBC, TOF, Tracking Chamber • No slewing correction yet. • No final adjustment of relative timing offset yet. • Flight path length need to be tuned. s ~ 170 ps Akio Kiyomichi [Univ. of Tsukuba]

  16. Detector instrumented Detector installed Pc 3 Install in summer 2000 P c TEC b S S b c P c S P b b P S c RICH RICH c MVD P S b DC b DC P G l c P S b b Pc1 Pc1 P G l Pc2 Pc3 ToF West East Spare Operation at PHENIX year1 • first collision 6/15 ~ end of run 9/4 • Charged Hadron PID by • Tracking Chamber (DC, PC, TEC) • Start counter(BBC), stop counter(TOF) Akio Kiyomichi [Univ. of Tsukuba]

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