1. S-2S MEMO WC detector test 2015/6/10 Toshiyuki Gogami

2. Contents  y-position dependence  HV dependence  Geometrical factor (Top and Bottom)  PMT individual difference (2 PMTs)

3. y-position dependence (NEW) In the previous measurement, optical grease was taken off day by day …  NPE reduction with time. In this time, the optical grease was changed to BC- 630 which has higher viscosity, instead of BaF 2.  No NPE reduction with time.  Proper y-dependence measurement (run60 – run82, 5/21 – 5/26)

4. LED calibration (run60 – run82) During this period, an air conditioner was kept turning ON. ~ 2% fluctuation  Systematic error

5. y - dependence Results (run60 – run82)

7. NPE dependence on HV setting HV settings were varied from -2100 V to -1800 V. (Run83 – Run97, 5/26 – 5/28) NPE dependence on HV setting

8. No dependence within the errors.

10. PMT Swapping (Run98 – run118, 6/1 – 6/8) To see 1.Geometrical factor (Top and Bottom difference) 2.PMT performance difference

11. Schematic drawing of PMT swapping test H11284-100UV ZK6922 H11284-100UV ZK6920 Trigger H11284-100UV ZK6920 H11284-100UV ZK6922 NPE = 106.5±0.3 98.1±0.3 94.1±0.5 112.5±0.5

12. Schematic drawing of PMT swapping test H11284-100UV ZK6922 H11284-100UV ZK6920 Trigger H11284-100UV ZK6920 H11284-100UV ZK6922 NPE = 106.5±0.3 98.1±0.3 94.1±0.5 112.5±0.5 Compare1 Geometrical factor (Top and Bottom difference) Compare2

13. Geometrical factor (Top and Bottom difference) Compare1 Compare2 = BOTTOM / TOP TOP is better than Bottom by 12%. This would be caused by how the Tyvek sheet was attached inside the container.

14. Schematic drawing of PMT swapping test H11284-100UV ZK6922 H11284-100UV ZK6920 Trigger H11284-100UV ZK6920 H11284-100UV ZK6922 NPE = 106.5±0.3 98.1±0.3 94.1±0.5 112.5±0.5 Compare1 PMT performance difference Compare2

15. PMT performance difference Compare1 Compare2 = ZK6520 / ZK6522 ZK6520 is able to detect more NPE than ZK6522 by ~5%

16. Summar y

17. Backup

18. NPE results (HV dependence) -2100../../ROOT/run84.dat.root 1 1 0.0 0.0 90.7167 134.717 1.03297 108.559 0.532655../../ROOT/run84.dat.root 1 2 0.0 0.0 68.6995 112.699 1.04026 104.11 0.914478../../ROOT/run84.dat.root 1 3 0.0 0.0 162.979 230.979 1.0256 207.906 0.776153 -2000../../ROOT/run96.dat.root 1 1 0.0 0.0 94.2146 122.215 1.00246 110.203 0.748738../../ROOT/run96.dat.root 1 2 0.0 0.0 60.351 108.351 1.16238 97.6955 0.462441../../ROOT/run96.dat.root 1 3 0.0 0.0 169.684 221.684 1.06667 204.626 0.811529 -1900../../ROOT/run87.dat.root 1 1 0.0 0.0 98.2911 150.291 1.21712 110.63 1.52708../../ROOT/run87.dat.root 1 2 0.0 0.0 75.7228 115.723 1.00613 97.4178 0.351164../../ROOT/run87.dat.root 1 3 0.0 0.0 159.83 223.83 1.29977 209.053 1.03874 -1800../../ROOT/run93.dat.root 1 1 0.0 0.0 85.6986 117.699 1.03561 106.039 0.718064../../ROOT/run93.dat.root 1 2 0.0 0.0 50.8157 114.816 1.00358 96.6688 0.584655../../ROOT/run93.dat.root 1 3 0.0 0.0 178.103 262.103 1.00166 202.65 1.68599

19. y-dependence (Phase 5)

20. TDC distribution of WC1 (ZK6922)

21. TDC distribution of WC1 (ZK6920)

22. TDC as a function of y

23. NPE width as a function of y

24. Timing width as a function of y

25. NPE vs. TDC ( 直接 PMT に入ったチェレンコフ 光とそうでない光がわけれるか も！ )