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Focal plane time and C herenkov counter analysis status

Focal plane time and C herenkov counter analysis status. HES HKS collaboration meeting 3/11/2010 T.Gogami. 23. Contents. T-zero adjustment WC AC High current run beta distribution. Time-zero adjustment. ideally , detectors are plane Detectors have segments

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Focal plane time and C herenkov counter analysis status

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  1. Focal plane time and Cherenkov counter analysis status HES HKS collaboration meeting 3/11/2010 T.Gogami 23

  2. Contents • T-zero adjustment • WC • AC • High current run beta distribution

  3. Time-zero adjustment • ideally , detectors are plane • Detectors have segments • timing differences of each segment cable length , module propagation time …. • Need to be correct  Time–zero adjustment The ways to correct • with t-zero counters (HTOF2Y , EHODO3) • without t-zero counter

  4. T-zero adjustment w/ t-zero counter t – zero counter set parameters to be T1=T2=T3=…. in the case of EHOOD2 T1 T3 T2 TOF [ns] • during experiment • HES side TOF [ns]

  5. T-zero adjustment w/o t-zero counter 2 1 assumption d = d’ d’ d T1 T2 T1 T0 • during experiment • HES side (edge) • HKS side • after experiment (fine tune) • HES side • HKS side • set parameters to be • T0 = T1 • (T0 = ) T1 = T2 • (T0 = T1 = ) T2 = T3 =…

  6. HKS beta distribution • correlation is straighter in FPx vs. β - βK • Kaon peak is on “0” in β - βK

  7. HES TOF distribution • TOF resolution σ ; 460 [ps]  360 [ps] long tale

  8. EH1 ID – EH2 ID TOF (esnt2 – esnt1) • Odd number counter’s TOF have long tale

  9. EH1 ID – EH2 ID TOF (esnt2 – esnt1) • EHODO2 – 17, 19, 21, 23, (25, 27, 29) are bad Discriminator ? , ECL cable ? , TDC slot?

  10. K+ coincidence time EHODO hit pattern K+ 17 event loss  EH2 bad channel should be excepted 19 21 23 25

  11. TDC of EHODO EHODO1 EHODO2

  12. Coincidence time separate clearly

  13. Normalized NPE (hwatnkn1,2) need two cut • easier to select K+ than before

  14. Normalized NPE (hwatnkn1,2) 1 dimensional cut X = 0 p X K+ cut K+ X = 1.2 p hwatnkn1+2 > 1.2 β - βK

  15. NPE time dependence (cosmic ray test) EHODO WC • new box • 4/15/2009 – 7/1/2009 (78 days) • Trigger EH1 × EH2 μ EHODO stable 78 days

  16. K+ NPE reduction (electron beam) low momentum side high momentum side 1-4 1-6 1-11 1-12 NPE NPE 24 days 24 days 39 days 63 days 39 days 63 days 2-2 2-5 2-7 2-10 NPE NPE 39 days 63 days 39 days 63 days

  17. NPE reduction (electron beam) reduced ~10 % • teflon if so, only high momentum side • PMT thermal dependence • water (chemicals … ) …. etc cause

  18. AC NPE 1-dimensional cut X = 30 π AC NPE1+2+3 < X K+ X β - βK 10Be , 40 [μA] K+ at X = 10 K+ 93 % π+ 10 % π+ X

  19. Focalplane x vs. beta Cr8uA CH2 2uA WC 1-1 & 1-2 K+ NPE distribution WC 1-1 & 1-2 K+ NPE distribution High current run  K+ beta distribution is not clear at low momentum side PMT sagging ? , TOF parameters ? , high multiplicity ?

  20. Summary • T-zero adjustment • 1st fine tuned • EHODO2-17 , 19 , 21 , 23 , 25 , 27 , 29 are bad should except • WC • normalized NPE • survival ratio of different threshold • K+ NPE reduction • AC • survival ratio of different threshold • High current run beta distribution • low momentum side beta is not clear at high current run

  21. Reference plane x vs. TOF (EHODO) selected bad counter

  22. etimetar – erf (before after)

  23. Coincidence time

  24. Coincidence time

  25. p and K+ survival ratio 1-dimensional cut

  26. WC K+ Number of photoelectron

  27. Bucking coil recovery ratio Kaon NPE Cosmic & HYCS NPE fit result • From kaon NPE reduction parameter • estimate Kaon NPE • just after beam time • ratio of expected value • from cosmic ray study + HYCS • ~88%

  28. Discriminator for EHODO • in the Hall

  29. Discriminator for EHODO • in counting room

  30. T-zero adjustment of HES w/o t-zero counter during experiment Counter ID TOF σ~420[ps] TOF

  31. AC NPE

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