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Enhancements in Drift Time and Distance Measurement for 52Cr Target in HKS Experiment

This document details the findings from the HES-HKS meeting held on July 15, 2011, discussing updates on the measurement corrections for the drift time and distance associated with the 52Cr target. Significant improvements in tracking residuals and correlation with drift parameters were noted, highlighting the enhanced performance of the KaoS experiment and the contributions of various team members. The report includes data analysis comparing pre- and post-correction tracking results, along with a summary of actions and preparations for future experiments.

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Enhancements in Drift Time and Distance Measurement for 52Cr Target in HKS Experiment

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  1. HES-HKS & KaoS meeting 15/July/2011 T.Gogami Wiesbadenのお風呂はこんな感じでした

  2. Content • E05-115 • KDC x-t parameter correction (H2O , 52Cr)

  3. E05-115 S.N.Nakamura Cherenkov .N.Taniya EHODO cabling ( 30/July/2009 )

  4. Residuals & x-t correlation CH2 target 52Cr target X-t function is worse ?

  5. abs(WC –TC) vs. Drift time CH2 target 52Cr target |Wire center – Track coordinate| Drift distance Drift distance Black : |WC-TC| Magenta : Profile of |WC-TC| Green : x-t calc. Track coordinate Wire center s 0

  6. abs(WC –TC) vs. Drift time ( with Tracking chi-square cut ) • trkchi2 < 100 • trkchi2 < 50 • trkchi2 < 10

  7. “Drift time” to “Drift distance”(HKS) PARAM / hdriftmap.param.0 number of array +50

  8. h_drift_dist_calc.f drift time Interpolate fractional part gradient ihi ilo

  9. KDC x-t function correction Profiling Fitting Function Parameters • (Tohoku PC in Mainz) • /home/gogami/E05-115/root/hksSingle/xt_calib/ • Makefile • xtCalib.cc • input/param.in • outdat/*.dat 5th order polynomial

  10. Drift Time & Drift Distance After Before 52Cr target (77120 – 77124)

  11. Drift Time & Drift Distance( DD>0.0 && DD<0.5 ) 52Cr target (77120 – 77124) After Before

  12. Drift Time & Drift Distance & residual Run 52Cr 77120 - 77124 Cut 0.0 [cm] < Drift distance < 0.5 [cm] After Before

  13. Tracking residuals (KDC1-x) H2O target 52Cr target • Number of event up! • Residual better! Before Before After After

  14. Tracking chi-square H2O target 52Cr target Tracking quality up! [1]. Total (after,before) = (94444,93226) 1.3% up [2]. Num( <10 ) (after,before) = (47151,43463) 8.5% up [1]. Total (after,before) = (45870,44864) 2.2% up [2]. Num( <10 ) (after,before) = (15279,13417) 13.9% up

  15. Ratio of the number of eventwith same chi-square cut H2O target 52Cr target Rough K+ selection • haernpe1+haernpe2+haernpe3<5.0 • hmsq<0.60 • hwatnkn1+hwatnkn2>1.0 [%] [%]

  16. KaoS experiment Aerogel Cherenkov Detector (13/July/2011)

  17. Preparation for beam time • Target (7Li,9Be) [Anselm] • Aerogel [Luka, Tohoku] • TOF [Florian] Cosmic-ray Test Cutting Aerogel New spacer

  18. Summary and To do • Summary • E05-115 • x-t function correction for 52Cr & H2O target (No iteration)  Got better • To Do • E05-115 • x-t function correction iteration for 52Cr & H2O target • Tracking(HES, HKS) • DC info selection with TOF, AC (WC) • Efficiency • EHODO • Low momentum side of HKS • E01-011 • Y-offset of RP pattern with SS hole cut • Decay pion experiment • 7/19- • APFP2011 • Conference Fee (Early :300USD, On-site:400USD) - 7/20 • Stay permission in Germany • Interview on 7/26 10:00-

  19. 公園で温泉が湧いてた End Wiesbaden, Germany (9/July/2011) ハーゲンダッツ

  20. Number Comparison (no cut) H2O target 52Cr target

  21. Number Comparison (Kaon Select) H2O target 52Cr target

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