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PID for super Belle (design consideration)

PID for super Belle (design consideration). Barrel (TOP counter) Possible configuration Geometry Endcap (Aerogel RICH) Photo detector options Barrel-Endcap. K. Inami (Nagoya-u). Aerogel RICH. TOP counter. 1.2m. 2.6m. e + 3.5GeV. e - 8.0GeV. Super B detector.

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PID for super Belle (design consideration)

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  1. PID for super Belle (design consideration) • Barrel (TOP counter) • Possible configuration • Geometry • Endcap (Aerogel RICH) • Photo detector options • Barrel-Endcap K. Inami (Nagoya-u)

  2. Aerogel RICH TOP counter 1.2m 2.6m e+ 3.5GeV e- 8.0GeV Super B detector • PID (p/K) detectors • Inside current calorimeter • Use less material and locate near calorimeter •  TOP and Aerogel RICH counters • both Cherenkov ring imaging detectors

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

  4. TOP counter • Measure Position+Time • Compact detector! Simulation 2GeV/c, q=90 deg. Linear array PMT (~5mm) Time resolution s~40ps ~2m ~200ps K p Different opening angle for the same momentum  Different propagation length(= propagation time) + TOF from IP works additively.

  5. Due to wavelength spread of detected photons, propagation time becomes worse. Longer propagation length  Improve ring image difference But, decrease time resolution.  Optimal propagation length. Light propagation velocity inside quartz Chromatic dispersion Variation of propagation velocity depending on the wavelength of Cherenkov photons

  6. Focus Mirror Possible configuration • Detector type • 3-readout type • Optimized propagation length • Simple configuration  less technical issue • Simple ring image  easy reconstruction • Focusing type • Correct chromaticity • 2/3 PMTs • Cost • Small dead space • Easy to replace PMTs because of no middle PMT • Complicated ring image • Need noble reconstruction method • May need more simulation study to check robustness

  7. Possible configuration • Photo-cathode of MCP-PMT • Multi-alkali • Almost established production • Enough lifetime • GaAsP • Better efficiency at longer wavelength • Need more production R&D and lifetime test • Multi-alkali without Al protection layer on MCP (option) • Better efficiency (x1.6) • Almost established production, but need some modification to improve lifetime (3-layer MCP, operation with lower gain, etc.) GaAsP MCP-PMT

  8. Performance • 3-readout type + GaAsP photo-cathode • >400nm filter, Correction Eff.=35% 3.5s K/p for 4 GeV/c, q=70ﾟ

  9. Performance • Focusing type + GaAsP photo-cathode • >400nm filter, Correction Eff.=35% 4.2s K/p for 4 GeV/c, q=70ﾟ

  10. Performance • Focusing type + Multi-alkali • >350nm filter, Correction Eff.=60% Because of complicated ring image 3.5s K/p for 3 GeV/c, q=70ﾟ

  11. TOP configuration summary • Focusing type can reduce the dead space and remove middle PMT.

  12. Similar with BaBar DIRC Narrow space for support structure Only 16mm between quartz bar Gaps in f  ~10% dead space ~1cm weak region from bar edge BaBar DIRC Al wall (1mmt) Quartz Geometry 18 counters in r-f

  13. Possible overlapped layout Need 50cm-width quartz bars ( 40cm-width) R1080 of inner radius ( R1150 for previous) Difficulty for support structure Complicated space Need simulation study Requirement from physics Check S/N with Brg/K*g etc. PID performance confirm dead space Effect to outer detector Geometry (2)

  14. Aerogel RICH • Radiator • Aerogel (n~1.05) • Multiple radiator option • Set suitable radiator index • By stacking the radiators, Increase Nphoton without deteriorating ring image • Photon detector • HAPD, MCP-PMT, MPPC etc. • Single photon detection • ~400nm Cherenkov photon • Operational under • ~1.5T magnetic field • High hit rate

  15. HAPD New MCP-PMT Old 20mm MPPC Photon detector option • HAPD • Good result from test bench with ASIC readout • Stability? Need more production R&D • MCP-PMT • Good TTS for TOF information • <20ps TOF resolution • Good ability for low momentum PID • Need lifetime estimation • SiPM/MPPC • Good stability, Enough gain and TTS • Need large effective area or light guide to make ~5x5mm2 anode • Need gated readout because of high dark count (<~MHz)

  16. Barrel Calorimeter PMT Radiator Drift chamber Forward endcap Calorimeter Barrel - Endcap • Need to minimize dead space • TOP needs PMT region at bar end. •  We can cover with aerogel radiator. • To detect Cherenkov light emitted to outside, we should set mirrors at Aerogel RICH outer cylinder. • Simulation study to estimate separation power • Some R&D with mirrors

  17. Summary • Photon detector is still main issue for designing. • GaAsP/Multi-alkali photo-cathode MCP-PMT for TOP • HAPD, MCP-PMT and MPPC with light guide for Aerogel RICH • TOP configuration • Focusing type + GaAsP photo-cathode MCP-PMT (>4.2s) • Option; Multi-alkali with efficiency improvement • Geometry of TOP bars • ~10% dead space along f • Overlapped TOP geometry  Check requirements from physics • Barrel – Endcap • Need design study of outer boundary of Aerogel RICH • Mirror to correct the out-going Cherenkov photons

  18. Virtual readout screen 22mm x 5mm matrix Focusing mirror 1850mm Focusing TOP • Use l dependence of Cherenkov angle to correct chromaticity • Angle information  y position • Reconstruct Ring image from 3D information (time, x and y). • Dqc~1.2mrad over sensitive l range •  Dy~20mm (~quartz thickness) • We can measure l dependence and obtain good separation even with narrow mirror and readout plane, because of long propagation length. Dqc~1.2mrad

  19. Possible layout with overlap Need 50cm-width quartz bar Geometry

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