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CBM-RICH: Photodetector developement H8500+nXyter+ROC readout

Piotr Koczo ń,GSI. CBM March 2009. CBM-RICH: Photodetector developement H8500+nXyter+ROC readout. P.Koczo ń, R.Karabowicz, R.Lalik, C.Schmidt, V.Kleipe, W.F.J.Müller. H8500+UV LED + nXyter readout Optical properties of pTer – r é sum é Outlook: WLS foils. Piotr Koczo ń,GSI.

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CBM-RICH: Photodetector developement H8500+nXyter+ROC readout

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  1. Piotr Koczoń,GSI CBMMarch 2009 CBM-RICH: Photodetector developement H8500+nXyter+ROC readout P.Koczoń, R.Karabowicz, R.Lalik, C.Schmidt, V.Kleipe,W.F.J.Müller H8500+UV LED + nXyter readout Optical properties of pTer – résumé Outlook: WLS foils

  2. Piotr Koczoń,GSI CBMMarch 2009 H8500+nXyter+ROC - setup Schematic view of the multiparameter measurement of WLS/H8500 properties HV Aperture mask with pinholes UV LED H8500 Light tight box 20 cm gate signal PulseGenerator ChargeDivider nXyter+ROC

  3. Piotr Koczoń,GSI CBMMarch 2009 H8500+nXyter+ROC - setup ChargeDivider nXyter ROC

  4. Piotr Koczoń,GSI CBMMarch 2009 Charge divider (Simone Bianco) H8500 multiplication factor ~106 @ 800V biasing voltage but sensitivity of nXyter input ~ 5 mips (125000 e) => an adapter is necessary!! The charge divider (details inhttp://cbm-wiki.gsi.de/cgi-bin/viewauth/Rich/CbmRichMeeting031208 ) is a C/R circuit: PMT N-XYTER We prepared several boards with different sets of R1, R2, C1, C2: S3 S5

  5. Piotr Koczoń,GSI CBMMarch 2009 Charge divider – 3rd try: not so bad 10 ns 15 ns 40 mV, S5 Qout Qin 1.6 V Qin /Qout = attenuation factor More advanced simulations by Tim Armbruster Uni HD result in an attenuation factor of 48.71 H.C. Soltveit (one of nXyter developers) claims that it should be possible to trimm the chip such, that the charge divider will be obsolete.

  6. Piotr Koczoń,GSI CBMMarch 2009 H8500 pinhole aperture Pin holes Aperture mask

  7. Piotr Koczoń,GSI CBMMarch 2009 System noise Amplitude [ch] Channel # nXyter has a very sensitive input, it is very noisy. Only by adjusting of global (and channel) offsets and thresholds can be done operational.

  8. Piotr Koczoń,GSI CBMMarch 2009 H8500 signal readout Ch#1 … … Ch#64 Collected charge

  9. Piotr Koczoń,GSI CBMMarch 2009 H8500 – signal readout 18 channel# 82 112 Collected charge Channel #

  10. Piotr Koczoń,GSI CBMMarch 2009 H8500 readout 78 82 108

  11. Piotr Koczoń,GSI CBMMarch 2009 H8500 readout Pixelnumber - Channel number - correspondence 18 ->P4 78,82 -> P29, P30 112 -> P32 H8500 - rear side

  12. Piotr Koczoń,GSI CBMMarch 2009 H8500 readout There ist obviously a misaligment betw. the mask and the PM P4 not understood ?

  13. Piotr Koczoń,GSI CBMMarch 2009 To do 1) H8500 cross-talk – future plans Hamamatsu claims for H8500: cross talk < 3% (electronics) WLS can add an additional cross-talk between neighbouring pixels when a photon undergoes absorption-reemision in the WLS layer or falls inclined on the PMs entrance window Photon transformed in WLS Inclined photon Propagation in WLS WLS Window (1mm) PM structure Simulations (Paola Solevi, Det.Lab. CERN): σ=3mm(WLS layer)

  14. Piotr Koczoń,GSI CBMMarch 2009 To do 2) Single photon counting capability using H8500+CD+nXyter+ROC Single Photon Counting capability has been demonstrated (Dubna 2008) in a coincidence measurement with 2“ Hamamatsu X2020 and Picoscope. SPC has to be also proved for H8500 with nXyter! Single photon? Double hit?

  15. Piotr Koczoń,GSI CBMMarch 2009 Ad 2) Single photon counting capability using H8500+CD+nXyter+ROC deltaT[ns] Channel # Coincidence measurement using nXyter system

  16. Piotr Koczoń,GSI CBMMarch 2009 • Conclusions (Part 1) • nXyter+ROC with CD seem to work • with H8500 • Further measurements of • a) cross talk between pixels with and w/o • WLS coating • b) single photon counting capability • with nXyter system • are necessary

  17. Piotr Koczoń,GSI CBMMarch 2009 • WLS – summary • P.Koczoń, C.Höhne, A.Braem • C.Joram, M. van Stenis • choice of the wavelength shifter material • silicon pads with WLS

  18. Piotr Koczoń,GSI CBMMarch 2009 Choice of the WLS material • Several WLS materials have been tested • (TPB, pTerphenyl, YellowX) • Different coating methods (evaporation, • spraying) • evaporated p-Terphenyl shows the highest gain • ageing in CO2 not (yet) observed • timing properties not studied

  19. Piotr Koczoń,GSI CBMMarch 2009 Integrated QE of pTer and TPB as function of photon energy extrapolation pTerphenyl shows the highest integrated gain

  20. Piotr Koczoń,GSI CBMMarch 2009 WLS embeded in silicon pads WLS - Si pad Advantages: 1) Much easier production as compared to evap. procedure 2) Can be prepared in advance in different thicknesses and WLS concentrations 3) Can be changed on the PM at any time 4) Can be easily exchanged in case of damage 5) WLS material protected from chem. influences Window (1mm) PM structure ~0.3 mm ? Does it work at all ? ?? Is thickness an issue ??

  21. Piotr Koczoń,GSI CBMMarch 2009 Thank You !

  22. Piotr Koczoń,GSI CBMMarch 2009 Cross-talks - setup HV Light guide bundle LED H8500 grey filter Light tight box XY-table PulseGenerator signal DAQ gate

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