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Volume Scan

Volume Scan. 福田 努 (Tsutomu Fukuda) Nagoya-univ. 7 Event located at Nagoya. Volume Scan. Volume Scan DATA set. 5plates. VTX Plate. After location, Volume Scan . Volume Scan Area is 1cm x 1cm from VTX point. Scanning 5plates upper VTX Plate and 10plates below VTX Plate. 10plates.

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Volume Scan

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  1. Volume Scan 福田 努(Tsutomu Fukuda) Nagoya-univ.

  2. 7 Event located at Nagoya Volume Scan

  3. Volume Scan DATA set 5plates VTX Plate • After location, Volume Scan . • Volume Scan Area is 1cm x 1cm from VTX point. • Scanning 5plates upper VTX Plate and 10plates below VTX Plate. 10plates 1cm 1cm

  4. Scanning time (first 4event) Scanning time/PL ~ time of PLATE set/PL

  5. Scanning time (later 3event) I change stream of PLATE set 　　→ time of PLATE set → ~1min/PL 1min

  6. About DATA quality PL28,29,30 – PL41,42,43 : 155Trk/cm2 (Nseg>9 -> BG=0) • Penetrate cosmic (Event 17868408 Brick#36564 ) Angle distribution (PL28 or 29 or 30) ~1cm ~1cm

  7. Reject low momentum Trks (top angle – bottom angle < 70mrad) 155Trks -> 132Trks • Efficiency (Event 17868408 Brick#36564 ) Average of Fillfactor = 0.811 Average of Efficiency = 0.80 (Tracking eff x Connection eff) Estimated total # of CR ~ 130/cm2 (> ~ 500MeV/c)

  8. Transportation alignment (Event 17868408 Brick#36564 ) PL28,29,30 – PL41,42,43 : 334Trk/cm2(BG=0) Angle distribution(PL28 or 29 or 30) Efficiency Average of Fillfactor = 0.652 Average of Efficiency = 0.59 (Tracking eff x Connection eff) Estimated total # of CR ~ 890/cm2 (> ~ 500MeV/c)

  9. Short Summary (1)

  10. BG Trk rejection • Virtual Erase • Linklet Quality check • BaseTrk Quality check

  11. Virtual Erase • Delete BaseTrk of Linklet in transportation. • Trk in transportation is ~1000本/PL • Rate of delete of trk at ECC alignment : ~ 0.2%

  12. Penetrate Trk VPH sum BG Trk VPH sum Linklet Quality check • VPH sum of Linklet(4surface) Penetrate Trk Angle difference BG Trk; XXXOXXOXXX Chain Angle difference

  13. BaseTrk Quality check penetrateTrk BG Trk • Angle difference (MicroTrk Angle – BaseTrkAngle) vs VPHsum (2surface) cut cut Vertical axis ：(dax1)2+(day1)2+(dax2)2+(day2)2

  14. Short Summary (2)

  15. About Event 182245114 • There is PLATE ID Xray Mark in Scan Area. • Efficiency~60%? → fail estimation of efficiency?? • For Data quality check and BG rejection, we analyze much more detail about effect for Alignment. → now processing

  16. Near Future • About Volume Scan Area and time

  17. VTX Analysis Scan stream Scan Level 1: VTX confirm Judgment ! ・ 1ry VTX ・ 2ry VTX ・ e-pair ・ Kink daughter Stop Plate 5mm Scan Level 2: Decay Search Volume (for momentum measurement) 1cm Scan Level 3: π0 Search Volume (~3X0)

  18. Recent Scanning time Sheet change • 5mm x 5mm x 7plates /Event Ev191894066 Ev187249566

  19. Reduction of Scanning time • Decrease Scanning Area 　　→ (16cm2 /16plate → 6.2cm2/14plate) • Omit Surface recognition of start of Scanning 　　→ already process in SUTS-03. data quality is good. 　　→ Scanning time is reduced 30%. • Both direction Scan 　　→ scanning time will be ½. 　　→ from now (Nakano-san) Scanning time : 6.2/16 x 0.7 x 0.5 x (390sec x 16plate) /60 ~ 14min Plate change time : 50sec x 14plate /60 ~ 12min Total : 14+12 = 26min/event

  20. Before vs After Linklet Chain

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