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Barrel PID upgrade

Barrel PID upgrade. Structure design Prototype study Beam test Photon detector Electronics Design study To do, cost estimation. K. Inami (Nagoya) Ljubljana, Hawaii, Cincinnati and PID group. 1.2m. 2.6m. e + 3.5GeV. e - 8.0GeV. Barrel PID upgrade.

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Barrel PID upgrade

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  1. Barrel PID upgrade • Structure design • Prototype study • Beam test • Photon detector • Electronics • Design study • To do, cost estimation K. Inami (Nagoya) Ljubljana, Hawaii, Cincinnati and PID group

  2. 1.2m 2.6m e+ 3.5GeV e- 8.0GeV Barrel PID upgrade • PID (K/p) detectors; Focusing DIRC, fTOP, iTOP • Cherenkov ring imaging detectors with quartz • Locate in the current TOF region Aerogel RICH Focusing DIRC / fTOP / iTOP

  3. Converging the detector design Wide bar (40~50cmW x 2cmT), focus mirror (R=5~7m) Shape of readout plane depends on the choice of photon detector Barrel PID options (Cincinnati) (Nagoya) (Hawaii) By A.Schwartz-san

  4. Structure (TOP counter, Nagoya) • Quartz: 255cmL x 40cmW x 2cmT • Focus mirror at 47.8deg. to reduce chromatic dispersion • Multi-anode MCP-PMT • Linear array (5mm pitch), Good time resolution (<~40ps) •  Measure Cherenkov ring image with precise timing information. 18 counters in f MCP-PMT

  5. CURRENT FUTURE Structure design (iTOP, M.Rosen-san, Hawaii) • Can locate iTOP standoff inside sBelle structure iTOP 16 modules in f TOP

  6. Structure design (M.Rosen-san) • Just started structure design • With KEK workshop engineer • Need optimization • Use honeycomb plates etc. Barrel Deflection with full Quartz Load ~1,150kg Deflection ~250um Barrel Deflection with full Quartz ~1,230kg Deflection ~300um

  7. Prototype development (Nagoya) • Demonstration of the performance Glued Glued 915mm 915mm PMT 400mm 400mm 400mm quartz quartz 20mm 20mm 20mm Prototype overview Photon detector 　・Time resolution 　・Efficiency Quartz radiator (Fused silica) 　・Flatness:<1.2mm/m 　・Roughness:0.5nm Filter (l>400nm) 　・Suppression of chromatic dispersion

  8. MCP-PMT Line 1 Line 2 Line 3 Quartz s<40ps Time resolution [ps] Propagation length [mm] Quartz radiator • Check the quality for time resolution • Single photon pulse laser • l=407nm • MCP-PMT • Several incident position •  No degradation of time resolution • Enough quartz quality MCP-PMT 47.2 deg.

  9. TOP counter Quartz bar (1850×400×20mm) Timing counter 10mmf quartz + MCP-PMT st0 < 15ps MWPC 1 MWPC 2 Trigger counter MCP-PMT (56ch) Lead glass + Finemesh PMT Quartz + support jig Beam test • At Fuji beam line in June and Dec. • Using real size quartz and MCP-PMT • MCP-PMT: Multi-alkali p.c., C.E.=60% • Check • Ring image • Number of photons • Time resolution

  10. [1count/25ps] [1count/25ps] Beam test results • Ring Image • Similar with Simulation • Number of photons • Ave. number of photons; 15.7 as expected • Time resolution 1st 3rd 1st 3rd 2nd 2nd Simulation Data

  11. Simulation Time resolution [ps] Propagation length [mm] Time resol. vs. propagation length • Check time resolution • For several incidence condition and channel • Data agrees well with simulation expectation.  Confirmed the level of chromatic dispersion effect

  12. Photon detector R&D (Nagoya) • Square-shape MCP-PMT by Hamamatsu • 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

  13. Lifetime tests (Nagoya) • Test with square-shape MCP-PMT • Multi-alkali p.c. with Al protection •  Short lifetime,position dependence • Test with round-shape MCP-PMT • MCP with 10mm pore • Multi-alkali p.c. • Aluminum protection on 1st MCP • 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. • Can expect to improve during R&D in next year Previous lifetime test Relative QE ? ~3 super-B years Output charge (mC/cm2)

  14. Square-shape MCP-PMT R&D • Multi-alkali p.c. SL10 • Added ceramic shield • To protect gas feedback •  Improved lifetime • Obtained normal Gain and TTS • Still need to irradiate more photons and study detail • Need to improve correction efficiency (~35%  ~60%) • Put Al protection layer on 2nd MCP •  Deliver April and May • GaAsP p.c. SL10 • Change the process method • To improve yield rate • Will add ceramic shield Preliminary result from HPK New Old Still need some R&D

  15. Readout elec. R&D (Hawaii) 6.4 ps RMS (4.5ps single) • Waveform sampling • Comparable performance to best CFD + HPTDC • MUCH lower power, no need for huge cable plant! • Using full samples significantly reduces the impact of noise Integrated module

  16. Readout elec. R&D (Hawaii) 32 FINESSE 8 COPPER 16k channels 2k BLAB3 128 SRM 128 DAQ fiber transceivers Already ~10% system Fabbed All pieces have prototypes in existence or in fabrication -- present performance results in July

  17. Design study • Simulation studies • Handmade + Geant3 (Nagoya) • Geant4 + ROOT (K.Nishimura-san, Hawaii) • Mathematica, Handmade?(Cincinnati) • Analytical calculation (M.Staric-san, Ljubljana) •  Reconstruction program for gsim study 2 readout 1 readout Standoff

  18. Design study with ring image (Cincinnati) • Prefer to use wide bar and standoff, in order to obtain clear difference of ring images

  19. Comparison btw. iTOP and fTOP (Hawaii) iTOP fTOP • For initial comparison purposes all assumptions are same… except • fTOP: No expansion length, 2 cm by 44 cm detector plane (SL10* PMT). • iTOP: 3.6 cm expansion length to a 10 cm x 44 cm detector plane (SL10* PMT) • Separability comparable, slightly better with imaging. • iTOP geometry optimization just started! Results may improve with optimization of bar width/thickness, focusing length, chosen photon detector, etc.

  20. Performance check (Nagoya) • GaAsP, CE=35%, l>400nm 10ps jitter

  21. Performance check (Nagoya) With 10ps jitter • GaAsP, CE=35% • l>400nm • Multi-alkali, CE=60% • l>350nm

  22. Simulation study (M.Staric-san) • Similar results with Nagoya’s simulation • For Bpp/Kp case, 2-readout type shows better results.

  23. Summary • Barrel PID based on DIRC/TOP • Cherenkov ring imaging with position and precise timing (<50ps) using Quartz + MCP-PMT • Wide bar (40~50cmW x 2cmT), focus mirror (R=5~7m) • Shape of readout plane depends on the choice of photon detector • Started structure design • Prototype study • Expected performance by beam test • Readout electronics with BLAB3 ASIC will be tested soon. • Photon detector • Lifetime test with round shape and square shape MCP-PMTs • Seems manageable lifetime. • Need to establish production reliability and lifetime • Design study • With several simulation programs • Need to obtain consistent result first and optimize design

  24. 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 (by A.Schwartz-san, Cincinnati) • $72k x 3 x 16 + alpha ~ 3.7M$ • From Taiwan (by C.H.Wang-san and P.Chang-san) • ?? • 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 • LABRADOR; <$10/ch • Structure

  25. What to do • Prototype study • Check ring image with focus mirror, quality of quartz radiators • Electronics prototype performance • Design study • Simulation programs showing consistent results • Design choice and optimization • 2-readout, 1-readout, standoff • Robustness against multi-track events, beam BG • With physics cases, again • Material of standoff and structure, Distance btw. radiator and ECL • Single layer, overlapped layout • Photon detector choice • Lifetime for MCP-PMT • Test with square-shape MCP-PMT from Hamamatsu and Photonis • Performance and production reliability • Hamamatsu vs. Photonis Determine the size • Photo-cathode (GaAsP/Multi-alkali) By next summer

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