1. The result of GoldenDOM Calibration Hiroko Miyamoto T.Noda, S.Yoshida, K.Mase K.Hoshina, M.Krasberg, K.Hanson, C.Rott Chiba University, UW Madison, PSU

2. Who is doing what?  Chiba University Hiroko, Keiichi, Tsuyoshi, Shigeru  UW-Madison Kael, Mark, Chris and FAT people …  PSU Carsten, Martin

3. Contents  Golden PMT calibration @ Chiba  Golden DOM calibration @ Chiba (useful LC circuit!)  DOM vs PMT?  Schedule

4. Golden PMT/DOM production and calibration 2004,Nov Hamamatsu Chiba Madison SouthPole Hamamatsu PMT QE calibration 2005,Jun. Jul. Aug. Sep. Oct.Nov.Dec. Chiba PMT calibration FAT#8 Chiba DOM calibration 2005/06 deployment

5. IceCube Golden PMT/DOM calibrations at Chiba [PMT] Low Temperature (-32C)  Gain  Waveform  Noise Rate Room Temperature  Relative Collection Efficiency (2π)  Absolute QExCE Efficiency (1 slice) http://www.ppl.phys.chiba-u.jp/research/IceCube/pmt/GoldenPMT/ for GoldenPMT calibration 2005 [DOM] Room Temperature  Relative Collection Efficiency (4π)  Absolute Efficiency (1 point)

6. Hakkenden (“eight” dog) Warriors….? DOM name PMT # Sosuke_Inukawa : TA1181 --failed Dosetsu_Inuyama : TA1069 Shino_Inuzuka : TA1052 Genpachi_Inukai : TA1167 Kobungo_Inuta : TA1062 Keno_Inuzaka : TA1056 --failed Shinbei_Inue : TA1059 Daikaku_Inuyama : TA1176 --failed

7. 2D PMT Scan  Data library available  Implemented in the detector MC

8. 2D CE map I TA1052 TA1059TA1062

9. 2D CE map II TA1069TA1167

10. PMT absolute calibration

11. Chamber and DAQ ATTENUATOR Pressure meter Temp monitor

12. Energy meterNumerical calculation Typically, ~ 4x10 9 x 5x10 -11 ~ 0.2 QExCE(absolute efficiency) = photoelectron # / cathode hit photon # cathode hit photon # ~ initial photon# x aperture x Cross Section Estimate incidental photon #.

13. Pedestal subtraction sf0077@1atm

14. 2DCE combined with 2D absolute QExCE

15. HAMAMATSU QE vs Chiba QExCE

16. Golden DOM calibration

17. How useful external trigger is?  SPE-based measurement SPE-based study is very important and fundamental, but we can’t see SPE signals from light source because of the bunch of noise  Control trigger rate You don’t need to take 10 kHz dark noises anymore but signals at a rate just as you like  Standalone operation DOM can take the data from the light source by itself alternatively (you don’t need other DOMs or MB anymore)  After pulse measurement You can trigger anytime you like, which enables you to see after pulses

18. Absolute efficiency measurement for DOM Same setup as for PMT (with 337nm N2 laser), except:  2000 incidental photons (increase the laser luminosity) N 2 laserN2N2

19. Shino_Inuzuka POS.1 POS.2 POS.3 POS.1 POS.2POS.3 DOM surface ~2cm

20. PMTs vs DOMs (Preliminary)

21. DOM efficiency + Acceptance( ) Glass/gel transmittance

22. DOM 2D 4  scan Map out the detection efficiency Combine DOM absolute efficiency and DOM 2D scanning map!

23. 2D Scanning System for DOM

24. Dosetsu_Inuyama Very very preliminary!

25. By the way… Quad-LC signal works very well as a event trigger. Cosmic μ (bkg) Rayleigh scattered Photon signal peak Externally triggered LED signal, no bkg

26. How about next year? We are providing another set of 8 Golden DOMs next year. Chiba calibrate and ship them to UW via Hamamatsu in May 2006 for FAT in May or June.

27. Any idea for this year? (with 5 Golden DOMs… ) For example…. Discussion Ice Layer

29. Genpachi_Inukai

30. Shinbei_Inue

32. Kobungo_Inuta

33. Dosetsu_Inuyama

34. Kobungo_Inuta

35. Shinbei_Inue

36. Shino_Inuzuka

37. Genpachi_Inukai

38. 2D CE map I TA1052 TA1059TA1062

39. 2D CE map II TA1069TA1167

40. HPK vs CHIBA