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CBM-RICH: Photodetector developement

Piotr Koczo ń,GSI. CBM Workshop February 2008. CBM-RICH: Photodetector developement. CBM Collaboration Meeting February 2008. P.Koczo ń, C.Höhne, A.Braem C.Joram, S.Ilie, M. van Stenis. Piotr Koczo ń,GSI. CBM Workshop February 2008. Piotr Koczo ń,GSI. CBM Workshop February 2008.

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CBM-RICH: Photodetector developement

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  1. Piotr Koczoń,GSI CBMWorkshop February 2008 CBM-RICH: Photodetector developement CBM Collaboration Meeting February 2008 P.Koczoń, C.Höhne, A.Braem C.Joram, S.Ilie, M. van Stenis

  2. Piotr Koczoń,GSI CBMWorkshop February 2008

  3. Piotr Koczoń,GSI CBMWorkshop February 2008 • Photodetector for RICH • CsI – MPWC, PM • Array photomultiplier: H8500, H9500 • geometrical properties -> coverage • optical properties -> quantum efficiency • electronical properties -> readout, cross-talk • H8500: room for improvements: • WLS coating: technology, measurements, results • Single Photon Counting: measurement, results • Outlook/Plans

  4. Piotr Koczoń,GSI CBMWorkshop February 2008 H8500 8x8 pads 5.8 x 5.8 mm each 89% packing density U=1100 V but borosilicate window and low QE for UV

  5. Piotr Koczoń,GSI CBMWorkshop February 2008 Wave-length shifter Tetraphenyl Butadiene TPB p-Terphenyl pTer

  6. Piotr Koczoń,GSI CBMWorkshop February 2008 Coating plant (theory) PMs Quartz crystal microbalance Vacuum Schutter Material Heating Boat

  7. Piotr Koczoń,GSI CBMWorkshop February 2008 Coating plant (reality)

  8. Piotr Koczoń,GSI CBMWorkshop February 2008 Depositing pTer, TPB and YellowX TPB pTer YellowX PM5 41 μg/cm263 μg/cm2 PM4 65 μg/cm295 μg/cm2276 μg/cm2 PM3 92 μg/cm2 PM2 162 μg/cm2 PM1 235 μg/cm2343 μg/cm2

  9. Piotr Koczoń,GSI CBMWorkshop February 2008 Quantum efficiency measurements (theory) • Monochromator • Vacuum • deep UV • no absolute QE • QE Test Bench (HPD) • Air • 200 nm cut off • abs. QE measurement

  10. Piotr Koczoń,GSI CBMWorkshop February 2008 Quantum efficiency measurements (reality) Monochromator QE Test Bench

  11. Piotr Koczoń,GSI CBMWorkshop February 2008 QE for XP3102 PRELIMINARY

  12. Piotr Koczoń,GSI CBMWorkshop February 2008 QE for XP3102 coated with TPB PRELIMINARY

  13. Piotr Koczoń,GSI CBMWorkshop February 2008 QE for XP3102 coated with pTer PRELIMINARY

  14. Piotr Koczoń,GSI CBMWorkshop February 2008 QE for XP3102 with YellowX PRELIMINARY

  15. Piotr Koczoń,GSI CBMWorkshop February 2008 QE for XP3102 @ far UV IA(λ) = F(λ) * QE(λ) R(λ) = IAwls(λ)/ IA(λ) = QEwls(λ) / QE(λ) QEwls(λ) = R(λ) * QE(λ) = IAwls(λ)/ IA(λ) * QE(λ)

  16. Piotr Koczoń,GSI CBMWorkshop February 2008 QE for XP3102 @ far UV IAwls(λ)/ IA(λ) PRELIMINARY for TPB for p-Ter

  17. Piotr Koczoń,GSI CBMWorkshop February 2008 QE for XP3102 @ far UV PRELIMINARY for TPB for p-Ter

  18. Piotr Koczoń,GSI CBMWorkshop February 2008 Single photon counting capability (theory) HV Light guide bundle LED PM n grey filters Light tight box PulseGenerator signal Pico FADC gate

  19. Piotr Koczoń,GSI CBMWorkshop February 2008 Single photon counting capability (reality) Light guide bundle LED Dark box n times grey filter HV signal Pulse generator (a bad one)

  20. Piotr Koczoń,GSI CBMWorkshop February 2008 Single photon counting capability - results

  21. Piotr Koczoń,GSI CBMWorkshop February 2008 Single photon counting capability - results Not convincing!!! A combined pulse-amplitude - time-series analysis necessary.

  22. Piotr Koczoń,GSI CBMWorkshop February 2008 • Open questions: • WLS • ageing in CO2 – next measurement at CERN in June 2008 • - mechanical properties • Single Photon Counting • - final proof for H8500 • Cross-talk between neighbouring pixels (with and w/o WLS) • Readout • nXyter – April 2008 • nXyter: adapter – charge divider • RICH-prototype for the test run in Fall´08

  23. Piotr Koczoń,GSI CBMWorkshop February 2008 Thank You !

  24. Piotr Koczoń,GSI CBMWorkshop February 2008

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