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Barrel PID upgrade

Explore structure design, prototype development, beam testing, photon detector advancements, and electronics optimization for improved performance. Collaboration between Nagoya, Ljubljana, Hawaii, Cincinnati teams in optimizing quartz-based detectors.

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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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