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Photon Detection efficiency in the Csi-based HADES RICH

Description of the HADES RICH OEM Measurament Digitization: Heuristic Model N0 Calculation. Photon Detection efficiency in the Csi-based HADES RICH. The RICH Detector. CaF 2 window. VUV mirror. Photon Detector : CH 4 MWPC CsI cathode 28.600 pads 10 m s readout.

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Photon Detection efficiency in the Csi-based HADES RICH

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  1. Description of the HADES RICH OEM Measurament Digitization: Heuristic Model N0 Calculation Photon Detection efficiency in the Csi-based HADES RICH L. Fabbietti (TU-München)

  2. The RICH Detector CaF2 window VUV mirror Photon Detector : • CH4 MWPC • CsI cathode • 28.600 pads • 10 ms readout L. Fabbietti (TU-München)

  3. Single events in the RICH Lepton Rings : • Constant Radius (deformed pads geometry) • Few pads per Ring Single Photon Response is CRUCIAL L. Fabbietti (TU-München)

  4. Efficiency calibration(OEM) Photons produced by 600 AMeV 12C beam particles passing two different solid radiators L. Fabbietti (TU-München)

  5. 2cm OEM Radiator beam beam line L. Fabbietti (TU-München)

  6. Single Photon Response Single Photon 1 Event Pulse Height Pad Y Coordinate Pad X Coordinate Photon Candidates : Local Maxima in an isolated 3X3 Pattern L. Fabbietti (TU-München)

  7. Single Photon Response 1 Event Single Photon Pulse Height Pad Y Coordinate Pad X Coordinate Photon Candidates : Local Maxima in an isolated 3X3Pattern L. Fabbietti (TU-München)

  8. Single Photon Charge Fit done for each sector separately L. Fabbietti (TU-München)

  9. Heuristic Model for Digitization (1) Coupling to the Upper/Lower pads(7,1) L. Fabbietti (TU-München)

  10. Heuristic Model for the Digitization (2) Coupling to the side pads(5,3) Coupling to the corner pads(0,2,6,8) L. Fabbietti (TU-München)

  11. Digitizer Output Simulated Data C @ 600 AMeV Experimental Data C @ 600 AMeV Normalized to the same number of events!! L. Fabbietti (TU-München)

  12. N0 > 90 OEM Analysis (1) Experimental Data : fired pads Simulation Input (HGeant) 100 Events N0=102 Digitization + Simulation of Electronic Noise L. Fabbietti (TU-München)

  13. OEM Analysis (2) • Cleaning of • Direct Hits(Reactions 5%) • Single Padsbelow a certain Charge Threshold. • Local MaximaIdentification, 2 ways: Maximum among 5 pads Maximum among 9 pads Pad Y Coordinate Pad X Coordinate L. Fabbietti (TU-München)

  14. 205 nm 145 nm 205 nm 163 nm 150 nm 205 nm 145 nm Q l Wave Length resolved Efficiency (1) Simulation Experiment Sector 2 MgF2 radiator L. Fabbietti (TU-München)

  15. SIO2 Radiator 163 nm 205 nm Q l Wave Length resolved Efficiency (2) L. Fabbietti (TU-München)

  16. N0 Calculation L. Fabbietti (TU-München)

  17. N0 Results Experimental Results extracted from the April 2002 data: C @ 600AMeV, N2 Radiator (extrapolation) L. Fabbietti (TU-München)

  18. The Analysis of the single Photon Response has allowed to develop an heuristic model for the digitization The Quantitative comparison between Experimental and Simulated Data enables an estimation of the value of N0 for each sector of the HADES RICH detector. The OEM measurement is going to be repeated during the next Experiment, to monitor the Efficiency of the detector. Conclusions and Outlook Thanks to the Munich RICH group :T.Christ, T.Eberl, L.Fabbietti, J.Friese, R. Gernhaeuser, L.Maier, B.Sailer and S.Winkler. L. Fabbietti (TU-München)

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