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Photon Detection efficiency in the CsI-based HADES RICH

Description of the HADES RICH OEM Measurement Digitization N0 Calculation Summary. Photon Detection efficiency in the CsI-based HADES RICH. The RICH Detector. C + C 1AGeV. Lepton Rings -> Few pads per Ring. 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 Measurement Digitization N0 Calculation Summary Photon Detection efficiency in the CsI-based HADES RICH L. Fabbietti (TU-München)

  2. The RICH Detector C + C 1AGeV Lepton Rings ->Few pads per Ring Photon Detector : • CH4 MWPC • CsI cathode • 28.600 pads • 10 ms readout Single Photon Response is CRUCIAL L. Fabbietti (TU-München)

  3. Efficiency calibration(OEM) Photons produced by 600 AMeV 12C beam particles passing two different solid radiators Beam pipe shadow 100 evt L. Fabbietti (TU-München)

  4. 2cm OEM Radiator beam beam line L. Fabbietti (TU-München)

  5. Single Photon Response Single Photon 1 Event Pulse Height Pad Y Coordinate Pad X Coordinate Photon Candidates : Local Maxima in an isolated 3X3Pattern Single Pads below Threshold and Charge Particle are cleaned Q Mean = 7 * 10 4 L. Fabbietti (TU-München)

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

  7. N0 > 90 OEM Analysis (1) Experimental Data : fired pads Simulation Input (HGeant) C@600AMeV 100 Events N0=102 Beam pipe shadow Digitization + Simulation of Electronic Noise L. Fabbietti (TU-München)

  8. 145 nm 205 nm 205 nm MgF2 Radiator 163 nm 150 nm Q l Wave Length resolved Efficiency (1) Simulation Experiment Sector 2 SIO2 Radiator L. Fabbietti (TU-München)

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

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

  11. 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)

  12. L. Fabbietti (TU-München)

  13. L. Fabbietti (TU-München)

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