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HES HKS meeting

HES HKS meeting. 24 Sep 2010 Toshiyuki Gogami. 9/4/2010 in Prague , Czech. Content. e , e + background mix rate debug in h_tof_pre.f. e,e + b.g . in HKS. TOP view. 5 × 5 [cm 2 ]. Side view. HKS - D. HKS - Q. X’ [rad]. X [cm]. B.G mix rate in HKS trigger. a.

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HES HKS meeting

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  1. HES HKS meeting 24 Sep 2010 Toshiyuki Gogami 9/4/2010 in Prague , Czech

  2. Content • e , e+ background mix rate • debug in h_tof_pre.f

  3. e,e+b.g. in HKS TOP view 5 × 5 [cm2] Side view HKS - D HKS - Q X’ [rad] X [cm]

  4. B.G mix rate in HKS trigger a just after pattern recognition ==>cut bad combination of space point (like TOF_pre) ==>CPU power , analysis time 52Cr (77124) b 12C (76077) 9Be (76607) 7Li (76184) . 10B (76184) B.G. mix rate = a/(a+b) ×1044

  5. Clusters in single residual vs. chi2 distribution Longer drift time events make clusters x’ [rad] track χ2 single residual [cm] drift time [ns] x [cm]

  6. h_tof_pre.f • pre track with space points • single hit in KTOF • multi hit in KTOF • start time calculation for drift time of chambers • correction (card)

  7. Bugs in h_tof_pre.f start time for drift time KTOF TDC information • single hit • multi hit (mean)

  8. Residual vs. χ2 CH2 target Current CH2 target Current Disappear clusters New CH2 target New 16 %

  9. Drift distancex’ vs. residual CH2 target Current Current Residual [cm] (KDC1-3) Stripe drift distance [cm] x’ [rad] @ reference plane New New Residual [cm] (KDC1-3) drift distance [cm] x’ [rad] @ reference plane

  10. Summary and to do • Summary • e,e+ background • cut just after pattern recognition • debug in “h_tof_pre.f” • disappear clusters in residual vs. chi2 distribution • drift time distribution got better • number of event up <== χ2 is better • to do • e,e+ b.g. cut routine • Hough transform • choose single hit ==> see all combination

  11. End Takeshi Hosomi 9/21/2010 @ 楓林 Nagao マーボー茄子定食 ~ 840 yen

  12. e,e+b.g.

  13. Residual vs. χ2 of KDC2 16% CH2 target

  14. Residual vs. χ2 of KDC2 40% 52Cr target

  15. Drift time before and after modified CH2 target 1-1 1-2 1-4 1-6 1-3 1-5 2-1 2-2 2-4 2-6 2-3 2-5

  16. Single residual σ = 170 [ps] σ = 170 [ps]

  17. KDC wire coordinate have discrete peak wire_coordinate 3 CH2 target (run76314) [ cm ] Wire_coord = ±Drift distance

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

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

  20. h_drift_dist_calc.f exceptional handling Drift time -50 200 [ ns ] Drift Distance Drift Distance 0.5 [cm] 0 [cm] 0.44 [%] 0.57 [%]

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