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Focal plane time and C herenkov counter analysis status

This report provides an overview of the current status of the focal plane time and Cherenkov counter analysis as discussed in the HES/HKS collaboration meeting held on March 11, 2010. Key topics covered include time-zero adjustments, beta distribution analysis, and performance assessments of various detectors and counter systems. It also highlights ongoing challenges such as timing differences, detector segmentation, and the impact of experimental conditions on data quality, particularly in relation to normalized photon electron statistics and kaon detection.

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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

  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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