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Updates at Nagoya univ.

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

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Updates at Nagoya univ.

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

  2. Photon detector R&D • Square-shape multi-anode MCP-PMT • Multi-alkali photo-cathode • Gain=1.5x106 @B=1.5T • T.T.S.(single photon): ~35ps @B=1.5T • Position resolution: <5mm • Semi-mass-production (14 PMTs) QE [%] σ=34.2±0.4ps QE：24%@400nm TDC [1count/25ps] Wavelength [nm] TTS＜40ps for all channels Ave. QE：17%@400nm 2009/7/7-9 B2GM

  3. Lifetime issue • Lifetime test with round-shape MCP-PMT • HPK R3809U • MCP with 10mm pore • Multi-alkali p.c. • Aluminum protection on 1st MCP • Recent production: CT108X • Initial Q.E.; 20% at 400nm • Initial Gain; 4x106 • 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. Relative QE Relative Gain ~3 super-B years 2009/7/7-9 B2GM Output charge (mC/cm2)

  4. Preliminary result from HPK New Old Measured at Nagoya 1 B2year ~ 0.7C/cm2 R&D status QE before againg QE after againg • 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 2nd MCP • ex. XM0007 • GaAsP p.c. SL10 • HPK successfully produced with rather reliable process. • Still need the reduction of dark current and lifetime test. Old type 2009/7/7-9 B2GM

  5. QE at 400nm R&D status XM0001 • Prototype performance • 3 pieces from HPK • QE: reasonable multi-alkali p.c. • Still need to improve • Enough gain: ~5x105 • Reasonable TTS: s=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. TDC vs ADC Cross-talk TDC after correction 2009/7/7-9 B2GM

  6. ~80mV ~8mV Cross-talk • XM0001; HV=–3400V • Height of cross-talk pulse: 1/10 of signal • Similar wth previous studies 2009/7/7-9 B2GM

  7. 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 2009/7/7-9 B2GM

  8. Performance Multi-alkali, CE=60%, l>350nm Efficiency Fake rate 2009/7/7-9 B2GM

  9. half mirror r = 50%, t = 50% focusing mirror r = 98% R = 1.5m Design consideration • Trial to improve forward part • Apply focusing technique • Bounce half of photons to be longer propagation length • Really possible? Matrix readout 2009/7/7-9 B2GM

  10. 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? 2009/7/7-9 B2GM

  11. Design study: to be considered • Quartz bar • Size: (90~120) x (40~50) x 2 cm3 • 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 mm2(28x28 in realistic) • Effective area: 22 x 22 mm2 • Channel: 4ch (Width:5.275mm, Gap:0.3mm) or 4x4ch • Multi-alkali p.c., QE=25%@400nm • Correction efficiency: 55% (60%) • TTS: ~35ps (distribution) 2009/7/7-9 B2GM

  12. Possible configuration with SL10 • 44cm width = 16MCP-PMTs • Max. 32 PMTs/module • Because of cost limitation • 4ch anode/PMT • Maybe, 4x4ch possible • 2 types+a; to be checked. 28mm pitch (22mm effective area) 16 SL10 16x2 SL10 2009/7/7-9 B2GM

  13. 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 2nd layer protection • Design study • Confirmation with actual effects is in progress. • Need to check the performance of possible design. 2009/7/7-9 B2GM

  14. 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? 2009/7/7-9 B2GM

  15. 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 2009/7/7-9 B2GM

  16. 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 2009/7/7-9 B2GM

  17. CAD from KEK workshop 2009/7/7-9 B2GM

  18. 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? 2009/7/7-9 B2GM

  19. Discussion • Cost for several choice • Quartz • Okamoto (Nagoya) • Zygo/OSI (Cincinnati) • MCP-PMT • Hamamatsu (Nagoya) • Photonis (Hawaii? Ljubljana?) • Electronics (Hawaii) • Structure (Hawaii, Nagoya) 2009/7/7-9 B2GM

  20. Cost estimate & Production time • Quartz bars • 16~18 modules (2x40x91.5cm3 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 2009/7/7-9 B2GM

  21. Discussion • Schedule toward 2013 2009/7/7-9 B2GM

  22. 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? 2009/7/7-9 B2GM

  23. 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. Make clean room Prepare optical stage etc… by the end of this year 2009/7/7-9 B2GM

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