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

2. Event Brick#CC/NC Stop Plate 179264151 20122 CC PL10 180277945 33540 CC PL56 178684089 36564 NC PL38 179351516 01429 CC PL47 181543007 53486 CC PL25 182245114 40953 CC PL46 187381090 40742 CC PL54 7 Event located at Nagoya Volume Scan

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

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

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

6. Penetrate cosmic ( Event 17868408 Brick#36564 ) PL28,29,30 – PL41,42,43 : 155Trk/cm 2 (Nseg>9 -> BG=0) Angle distribution ( PL28 or 29 or 30 ) ~1cm About DATA quality

7. Efficiency ( Event 17868408 Brick#36564 ) Reject low momentum Trks (top angle – bottom angle < 70mrad) 155Trks -> 132Trks Average of Fillfactor = 0.811 Average of Efficiency = 0.80 (Tracking eff x Connection eff) Estimated total # of CR ~ 130/cm 2 (> ~ 500MeV/c)

8. Transportation alignment PL28,29,30 – PL41,42,43 : 334Trk/cm 2 (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/cm 2 (> ~ 500MeV/c) ( Event 17868408 Brick#36564 )

9. Short Summary (1) Event Brick## of Scan Plates eff (ECC) # of CR ( /cm 2 ) eff( 輸送 時 ) # of CR ( /cm 2 ) 17926415120122 15 ( PL01-PL15 ) 0.82 ~150 0.64 ~1000 18027794533540 12 ( PL46-PL57 ) 0.89 ~190 0.69 ~1060 17868408936564 16 ( PL28-PL43 ) 0.80 ~130 0.59 ~890 17935151601429 16 ( PL37-PL52 ) 0.79 ~140 0.59 ~860 18154300753486 16 ( PL15-PL30 ) 0.80 ~90 0.57 ~710 18224511440953 16 ( PL36-PL51 ) 18738109040742 14 ( PL44-PL57 ) 0.85 ~130 0.69 ~1230

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

13. BaseTrk Quality check Angle difference (MicroTrk Angle – BaseTrkAngle) vs VPHsum (2surface) penetrateTrkBG Trk Vertical axis ： (dax 1 ) 2 +(day 1 ) 2 +(dax 2 ) 2 +(day 2 ) 2 cut

14. Short Summary (2) Event Brick## of Scan Plates eff (ECC) Before BG rejection eff (ECC) After BG rejcetion #of BaseTrk/PL (after /before) 17926415120122 15 ( PL01-PL15 ) 0.82 0.81 2003/19680 18027794533540 12 ( PL46-PL57 ) 0.89 1203/10221 17868408936564 16 ( PL28-PL43 ) 0.80 0.79 1464/12403 17935151601429 16 ( PL37-PL52 ) 0.79 1483/11961 18154300753486 16 ( PL15-PL30 ) 0.80 0.77 1693/15742 18224511440953 16 ( PL36-PL51 ) 18738109040742 14 ( PL44-PL57 ) 0.85 1599/15967

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 Judgment ! ・ 1ry VTX ・ 2ry VTX ・ e-pair ・ Kink daughter 1cm Scan Level 1: VTX confirm Scan Level 2: Decay Search Volume (for momentum measurement) Scan Level 3: π 0 Search Volume ( ~3X 0 ) Stop Plate 5mm

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

19. Reduction of Scanning time Decrease Scanning Area → (16cm 2 /16plate → 6.2cm 2 /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

22. Before vs After 0skip1skip2skip Reject 前 465 2221 8057 Reject 後 263 389 826 # of Chain# of Group efficiency Reject 前 112563 63530 0.80 Reject 後 10624 8553 0.79 Linklet Chain