1. Updates at Nagoya univ. K.Inami (Nagoya) - Photon detector R&D - Lifetime improvements - Simulation design study

2. 2009/7/7-9 B2GM2 Photon detector R&D Square-shape multi-anode MCP-PMT –Multi-alkali photo-cathode –Gain=1.5x10 6 @B=1.5T –T.T.S.(single photon): ~35ps @B=1.5T –Position resolution: <5mm Semi-mass-production (14 PMTs) σ=34.2±0.4ps QE ： 24%@400nm Ave. QE ： 17%@400nm TTS ＜ 40ps for all channels TDC [1count/25ps] Wavelength [nm] QE [%]

3. 2009/7/7-9 B2GM3 Lifetime issue Lifetime test with round-shape MCP-PMT –HPK R3809U –MCP with 10  m pore –Multi-alkali p.c. –Aluminum protection on 1 st MCP –Recent production: CT108X Initial Q.E.; 20% at 400nm Initial Gain; 4x10 6 –TTS keeps <40ps. –Need to improve for initial Q.E. and initial aging –Slope seems to be manageable. We can expect to improve during R&D. Output charge (mC/cm 2 ) Relative QE Relative Gain ~3 super-B years

4. 2009/7/7-9 B2GM4 R&D status Multi-alkali p.c. SL10 –Added many protection for gas and ion feedback  Improved lifetime ex. JT0087 Obtained normal Gain and TTS –Even with improved correction efficiency (~35%  ~60%) Put Al protection layer on 2 nd MCP ex. XM0007 GaAsP p.c. SL10 –HPK successfully produced with rather reliable process. –Still need the reduction of dark current and lifetime test. Preliminary result from HPK Old New Measured at Nagoya 1 B2year ~ 0.7C/cm 2 QE before againg QE after againg Old type

5. 2009/7/7-9 B2GM5 R&D status Prototype performance –3 pieces from HPK –QE: reasonable multi-alkali p.c. Still need to improve –Enough gain: ~5x10 5 –Reasonable TTS:  =35~45ps –CE: ~55% Basic performance is OK.  Lifetime test at Nagoya soon.  New improved type will be ready at the end of this month. Cross-talk QE at 400nm TDC vs ADC TDC after correction XM0001

6. 2009/7/7-9 B2GM6 Cross-talk XM0001; HV=–3400V –Height of cross-talk pulse: 1/10 of signal –Similar wth previous studies ~80mV ~8mV

7. 2009/7/7-9 B2GM7 Design study Check performance for several designs –With actual effects MCP-PMT: QE, CE, TTS, dead space Start timing fluctuation (25ps) 2-bar fTOP 1-bar fTOP iTOP

8. 2009/7/7-9 B2GM8 Performance Multi-alkali, CE=60%, >350nm Efficiency Fake rate cos  region GoodBad 2-bar0~0.60.6~0.8 1-bar (iTOP)0~0.3,0.6~0.3~0.6

9. 2009/7/7-9 B2GM9 Design consideration Trial to improve forward part Apply focusing technique –Bounce half of photons to be longer propagation length –Really possible? focusing mirror r = 98% R = 1.5m half mirror r = 50%, t = 50% Matrix readout

10. 2009/7/7-9 B2GM10 Design study summary TOP performance for several condition –Two readout type Multi-alkali p.c.2~3% fake-rate for 3~4GeV/c GaAsP p.c.<2% Start time fluctuation (25ps)>10% for forward part –Maybe possible to improve –One readout type GaAsP p.c.3~4% Multi-alkali p.c.4~6% Depends on the photon detector design –GaAsP p.c.  Both type OK –Multi-alkali p.c.  How many channels can we use?

11. 2009/7/7-9 B2GM11 Design study: to be considered Quartz bar –Size: (90~120) x (40~50) x 2 cm 3 –Edge cut (chamfer): C 0.3~0.5 mm –Flatness at glue point –Deviation of refractive index MCP-PMT (SL10) –Size: 27.5 x 27.5 mm 2 (28x28 in realistic) Effective area: 22 x 22 mm 2 –Channel: 4ch (Width:5.275mm, Gap:0.3mm) or 4x4ch –Multi-alkali p.c., QE=25%@400nm –Correction efficiency: 55% (  60%) –TTS: ~35ps (distribution)

12. 2009/7/7-9 B2GM12 Possible configuration with SL10 44cm width = 16MCP-PMTs Max. 32 PMTs/module –Because of cost limitation 4ch anode/PMT –Maybe, 4x4ch possible 2 types+  to be checked. 28mm pitch (22mm effective area) 16x2 SL10 16 SL10

13. 2009/7/7-9 B2GM13 Summary MCP-PMT R&D –Lifetime tests Round shape MCP-PMT shows manageable lifetime. Square shape MCP-PMT –Improved lifetime by adding many protection for gas and ion feedback –Even with 2 nd layer protection Design study –Confirmation with actual effects is in progress. –Need to check the performance of possible design.

14. 2009/7/7-9 B2GM14 Discussion MCP-PMT is ready? –Hamamatsu SL10 Multialkali p.c., CE=55% GaAsP p.c., CE=35% –Photons MCP-PMT Bialikali p.c. CE=60%? –Basic performance is OK for both? Check QE availability –Lifetime is OK? Hamamatsu: Probably OK from HPK and Nagoya study. Photonis: Look OK Need a few month to confirm. –Cost and Production schedule?

15. 2009/7/7-9 B2GM15 Discussion Design studies converged? –Check with benchmark structure –Include actual effects Start timing fluctuation Incident track fluctuation Actual design of quartz and MCP-PMT –Check PID performance for several incidence condition  Feedback to structure study –Check performance for some physics cases With fsim With gsim4 and analysis code

16. 2009/7/7-9 B2GM16 Discussion Structure studies –Show technically possible quartz layout and size  Feedback to simulation study –Connection to ECL and CDC –Quartz support Honeycomb plates? –PMT support PMT maintenance possibility –Discuss with KEK workshop

17. 2009/7/7-9 B2GM17 CAD from KEK workshop

18. 2009/7/7-9 B2GM18 Discussion Electronics –Readout and trigger BLAB3 –Performance and data structure –Cost and schedule CFD ASIC? –Schedule –Readout TDC? On COPPER? –HV system Need ~500ch, HV<-4kV CAEN HV system? –LV system How large?, How many ch?

19. 2009/7/7-9 B2GM19 Discussion Cost for several choice –Quartz Okamoto (Nagoya) Zygo/OSI (Cincinnati) –MCP-PMT Hamamatsu (Nagoya) Photonis (Hawaii? Ljubljana?) –Electronics (Hawaii) –Structure (Hawaii, Nagoya)

20. 2009/7/7-9 B2GM20 Cost estimate & Production time Quartz bars –16~18 modules (2x40x91.5cm 3 x3 + mirror, standoff) –Okamoto optics (by Nagoya) 1800x18+2700 万円 ~ 3.6M$, 2 years –Zygo/OSI (by A.Schwartz-san, Cincinnati) $72k x 3 x 16 + alpha ~ 3.7M$ Photon detector (increasing gradually) –MCP-PMT by Hamamatsu; 600 pieces for TOP, 3 years Multi-alkali photo-cathode; ~2.7M$ GaAsP photo-cathode; ~4.2M$ –MCP-PMT by Photonis; ??? (expect cheaper price?) Electronics Structure

21. 2009/7/7-9 B2GM21 Discussion Schedule toward 2013

22. 2009/7/7-9 B2GM22 Discussion Schedule toward technology choice –By the end of August Make list of possible options –In our case, MCP-PMT choice is important. Make performance catalogue for –MCP-PMTs »QE, CE, TTS, Gain, Lifetime, –Detector configuration »Separation power (eff./fake) »Robustness (beam BG, T0, tracking, photon loss) –By the end of December Decide detector configuration and technology –Show test results »MCP-PMT lifetime, Simulation study, electronics test To be Checked by internal review committee?

23. 2009/7/7-9 B2GM23 Discussion Schedule in this year (Prototype production) –Make prototype with Zygo/OSI quartz New support structure Photonis or HPK MCP-PMT New electronics –Check performance at KEK First, make prototype of radiator (Quartz + support) and photon detector (MCP-PMT + Electronics) and check performance, individually. by the end of this year Make clean room Prepare optical stage etc…