Barrel PID summary K.Inami (Nagoya) Summary of R&D at Hawaii, Cincinnati, Ljubljana and Nagoya TOP conceptual design - 2009/7/7-9 B2GM Photon detector Electronics Quartz, mirror Support structure Detector design 2 Photon detector R&D by Nagoya • Hamamatsu MCP-PMT (SL10) – – – – – Square-shape multi-anode Multi-alkali photo-cathode Gain=1.5x106 @B=1.5T T.T.S.(single photon): ~35ps @B=1.5T Position resolution: <5mm σ=34.2±0.4ps QE [%] • Semi-mass-production (14 PMTs) QE：24%@400nm TDC [1count/25ps] TTS＜40ps for all channels 2009/7/7-9 B2GM Wavelength [nm] Ave. QE：17%@400nm 3 QE at 400nm (XM0001) Lifetime issue • Multi-alkali p.c. SL10 – Added many protection for gas and ion feedback Improved lifetime • ex. JT0087 • Obtained normal Gain and TTS Preliminary result from HPK – Even with improved correction efficiency (~35% ~60%) • Put Al protection layer on 2nd MCP • ex. XM0007 – Prototype performance is OK. • Enough gain: ~5x105 • Reasonable TTS: s=35~45ps • CE: ~55% 2009/7/7-9 B2GM New Old Measured at Nagoya 4 1 B2year ~ 0.7C/cm2 by Ljubljana from E-PID session Photonis PMT • MCP-PMT – Model 85015/A1 • Bialkali photocathode • 10mm pore MCP • No Al protection layer – Gain~6x105 – TTS<~40ps • Started lifetime test – 200mC/cm2 – Signal yield; 10% drop? • To be checked 2009/7/7-9 B2GM 5 Electronics status by Hawaii • Started to design front-end electronics for HPK SL10 – HV divider circuit – BLAB3 readout board Detector design optimization 2009/7/7-9 B2GM 6 Radiation hardness test • Put front-end ASIC, FPGA and fiber inside detector • Check radiation hardness – Put prototype board in KEKB tunnel and check FPGA reprogram rate and fiber link degradation – Started from May 17. – Ran fine through end of Exp.69 • Need to make conclusion 2009/7/7-9 B2GM 7 Quartz bar, mirror by Cincinnati • Quality and performance of mirror and wedge – Produced by OSI at US • Test glues – NOA63; UV cure-type • Check with laser now. • Need to be check quality for real-size quartz components 2009/7/7-9 B2GM 8 Support structure by Hawaii • Conceptual structure design – Check distortion of quartz radiator for several designs – Quartz supported by Honeycomb box – TOP module support (Discussing with KEK mechanics group) 2009/7/7-9 B2GM 9 Design studies by Hawaii, Ljubljana, Nagoya • Check performance for several designs – With actual effects • MCP-PMT: QE, CE, TTS, dead space • Start timing fluctuation (25ps) • Cross-checked by several simulation programs – Geant3 based (Nagoya) – Geant4 based (Hawaii) – Analytical method (Ljubljana) Almost ready for reconstruction code 2-bar fTOP 1-bar fTOP MCP-PMT photo-cathode - Multi-alkali - GaAsP iTOP 2009/7/7-9 B2GM 10 Performance check by Nagoya Multi-alkali, CE=60%, l>350nm cosq region Good Bad 2-bar 0~0.6 0.6~0.8 1-bar (iTOP) 0~0.3,0.6~ 0.3~0.6 Efficiency Fake rate 2009/7/7-9 B2GM 11 Performance check by Hawaii Multi-alkali • Generally performance better for 2-bar except forward part – Similar tendency with Nagoya’s result 2009/7/7-9 B2GM 12 Performance check by Ljubljana GaAsP • Similar with other programs • Need to make figures for multi-alkali photo-cathode 2009/7/7-9 B2GM 13 Design study summary • 2-bar fTOP – Multi-alkali and GaAsP p.c. is OK for backward – Start time fluctuation (25ps) makes bad performance for forward • iTOP / 1-bar fTOP – GaAsP is OK – Multi-alkali p.c. makes slightly worse performance • Need more checks – Include actual effects • Start timing fluctuation, Incident angle fluctuation • Actual design of quartz and MCP-PMT – Performance for some physics cases • With fsim • With gsim4 and analysis code 2009/7/7-9 B2GM 14 Cost estimate & Production time • Quartz – 16~18 modules (2x40x91.5cm3 x3 + mirror, wedge) – Okamoto optics (fTOP case) • 1800x18+2700万円 ~ 3.6M$, 2 years – Zygo/OSI • Zygo quartz bar 3.5~4.1M$, 1~1.5 years • OSI mirror and wedge 0.84+0.71M$, 0.5years • MCP-PMT – Hamamatsu; 600 pieces for 2-bar TOP, 3 years • Multi-alkali photo-cathode; ~2.7M$ • GaAsP photo-cathode; ~4.2M$ – Photonis; 600 pieces for iTOP, 3 years?? • Bi-alkali photo-cathode; 3~6M$?? to be checked 2009/7/7-9 B2GM 15 Cost estimate & Production time • Electronics – SL10 basis, frontend+backend+HV divider – 2-side readout ~0.5M$ • Without NRE, COPPER, BLAB3 ASIC • Structure – To be estimated. 2009/7/7-9 B2GM 16 Schedule toward 2013 2009/7/7-9 B2GM 17 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) To be Checked by internal review committee? • By the end of December – Decide detector configuration and technology • Show test results – MCP-PMT lifetime, Simulation study, electronics test 2009/7/7-9 B2GM 18 Summary • MCP-PMT – – – – Hamamatsu SL10 (Multi-alkali p.c., 28(22)x28(22)mm2, 4ch or 4x4ch) Photons 850xx (Bi-alkali p.c., 59(52)x59(52)mm2, 8x8ch) Both performance is OK. Need a few month to confirm lifetime • Electronics – SL10 base production is in progress – Radiation hardness test done. To be confirmed. – BLAB3 ASIC fabrication in autumn • Quartz – Zygo/OSI products are tested now. • Design study, Structure study – Need to check possible configuration with actual effects • We will discuss in detail at PID meeting at Nagoya in next week. 2009/7/7-9 B2GM 19
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