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Explore the advancements in Time of Flight (TOF) analysis at the Yonsei–Tsukuba Workshop by Hiroshi Tsuruoka. Updates include new calibration parameters and performance improvements. Learn about TOF performance, slewing correction, and experimental results. Stay informed about the latest developments in TOF analysis.
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Yonsei – Tsukuba Workshop ／ Hiroshi Tsuruoka ／Aug 22 2001 Current Status of TOF Analysis １．PHENIX実験とは ２．なぜ新たな検出器が必要か？ ３．Time Zero Counter の設計 ４．テスト実験（KEK） ５．まとめ １
Yonsei – Tsukuba Workshop ／ Hiroshi Tsuruoka ／Aug 22 2001 TOF Performance CERN WA98 (1996) PHENIX TOF (Dec 2000) Tsukuba-Yonsei Workshop By Akio Kiyomichi σ<110ps s ~ 85ps We want to understand the contents of 110psec time resolution. • New calibration parameter • Another cause • Cable length , FEM jitter ２
Yonsei – Tsukuba Workshop ／ Hiroshi Tsuruoka ／Aug 22 2001 New Calibration Parameter Dec , 2000 Aug , 2001 9 TOF parameter set 9 TOF parameter set Update ! • Time offset • Slewing parameter • Y position offset • Light velocity in scint. • Energy loss conversion factor • Time conversion factor • Charge conversion factor • TVC/QVC pedestal • Global Time offset ( still 0 value ) • Time offset • Slewing parameter • Y position offset • Light velocity in scint. • Energy loss conversion factor • Time conversion factor • Charge conversion factor • TVC/QVC pedestal • Global Time offset Update ! Update ! Update ! Update ! By Akio Kiyomichi BBC parameter set BBC parameter set No Run dependence Checked Run dependence By Takashi Hachiya (Univ. of Hiroshima) ３
Yonsei – Tsukuba Workshop ／ Hiroshi Tsuruoka ／Aug 22 2001 Example. Slewing Correction Update Old（DSTv03） New（DSTv05） Timing[ns] Timing[ns] QVC[ch] QVC[ch] Spread • Problem in v03: • Slewing curve is weak by effect of attenuation. • for DSTv05 • Select hit region on scintillator. • To compensate for low statistics, add 32 PMTs with • PMT Gain correction & Timing adjustment Fitting function: y = A + B/sqrt(x) 6cm PMT |Track_projection - slat_center| <3cm 64cm Akio KiyomichiAnalysis meeting@BNL Aug 2 2001 ４
Yonsei – Tsukuba Workshop ／ Hiroshi Tsuruoka ／Aug 22 2001 TOF Performance For Year-1 used data : run11011 - 11775 cut criteria : • centrality 0-5% [cent == 0] • dch_quality == 23 or 31 • eloss > 2MeV • dR < 2 sigma (matching cut) • |tofz|<50cm && tofy>-100cm • (panel 3 or 4) Timing[ns] • Year-1 Time-of-flight resolution < 100ps. Momentum [GeV/c] Akio KiyomichiAnalysis meeting@BNL Aug 2 2001 ５
Yonsei – Tsukuba Workshop ／ Hiroshi Tsuruoka ／Aug 22 2001 Another Cause worsen resolution • Cross talk on FEM board • several hits on slat cross talk ! ALL 501event 96 ± 5 ps No cross talk 462event 97 ± 5 ps Clean hit only 341event 89 ± 7 ps several hits TOF – L／（c・β）[nsec] clean hit ! • A cut of clean hit only is effective ! Cut Criteria : Run11011-11775,cent[0-5%],Q=23or31,eloss>2MeV,dR<2sigma,1.4<p<1.8MeV,TOF Panel 1,3and4 ６
Panel 3or4 , Run#10758-11775 Panel 3or4 , Run#11011-11775 Panel 1or3or4 , Run#11011-11775 Panel 1or3or4 , Run#10758-11775
No Cross Talk Cross Talk Clean Hit Only < 2 Hits
Yonsei – Tsukuba Workshop ／ Hiroshi Tsuruoka ／Aug 22 2001 37m Cable + FIFO (PHENIX) or NONE(WA98) North South ① ～WA98 TOF FEM TOF FEM FIFO σ～42ps ③ ② ～3300 ② BBC TM ① ①BBC TM ========================⇒TOF FEM(N) ②BBC TM⇒TOF(S)side======⇒BBC side⇒TOF FEM(N) ③BBC TM⇒TOF(S)side⇒FIFO⇒BBC side⇒TOF FEM(N) σ～50ps ～3000 ③ ～PHENIX • TVC=3300[ch] is the dynamic range which we can measure a particle of beta=1. • FIFO works as discriminator module. • A 37 meter long cable worse resolution a little. σ～47ps ～3270 TVC[ch] ７
Yonsei – Tsukuba Workshop ／ Hiroshi Tsuruoka ／Aug 22 2001 The Jitter between TOF and BBC ８
Yonsei – Tsukuba Workshop ／ Hiroshi Tsuruoka ／Aug 22 2001 Jitter ９
Yonsei – Tsukuba Workshop ／ Hiroshi Tsuruoka ／Aug 22 2001 20nsec delay cable problem Year-1 Year-2 ~1500ch ~ 2200ch １０
Yonsei – Tsukuba Workshop ／ Hiroshi Tsuruoka ／Aug 22 2001 Appendix Online Monitoring By Kuroki １１
Yonsei – Tsukuba Workshop ／ Hiroshi Tsuruoka ／Aug 22 2001 ５．まとめ １２
