Photon Detection Efficiency in the CsI-based HADES RICH

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Presentation transcript:

Photon Detection Efficiency in the CsI-based HADES RICH Description of the HADES RICH OEM Measurement Single Photon Response N0 Calculation Summary L. Fabbietti (TU-München)

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

Efficiency Calibration (Online Efficiency Measurement (OEM)) Calibrated light source ! Photons produced by 600 AMeV 12C beam particles passing two different solid radiators n(l) -> QC(l) 1 0.8 0.6 0.4 0.2 0.0 SiO2 MgF2 Transmission 120 140 160 180 200 220 l [nm] L. Fabbietti (TU-München)

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

Single Particle Response Nph ~ N0 * Z2 100 evt accumulated single 12C hit beam pipe shadow SiO2 MgF2 L. Fabbietti (TU-München)

Single Photon Response of MWPC wires 1 Event Single Photon Pattern Pad Y Coordinate Pulse Height 6 mm 6 mm Pad X Coordinate Q Mean = 7 * 10 4 e- eSE ~ 90% Photon Candidates : Local Maxima in an isolated 3X3 Pattern Single Pads below Threshold (4 s) and Charge Particle are cleaned L. Fabbietti (TU-München)

Coupling to Neighbouring Pads Along the wire  photon impact resolution ~ 0.5 mm Perpendicular to wire L. Fabbietti (TU-München)

Charge Distribution of Single Photons Simulation Experiment single photon response well understood L. Fabbietti (TU-München)

Simulation Input (HGeant) OEM Analysis Experimental Data Simulation Input (HGeant) C@600 AMeV 100 Events N0=102 Beam pipe shadow Optical parameters (all independently measured) Simulation of single photon response Electronic noise L. Fabbietti (TU-München)

Wave Length Resolved Efficiency Simulation Experiment Sector 2 MgF2 Radiator 150 nm 205 nm 145 nm 163 nm SIO2 Radiator MgF2 SiO2 Q l L. Fabbietti (TU-München)

N0 Calculation Translation to HADES C4F10 Radiator L. Fabbietti (TU-München)

N0 Results Sector 1 MgF2 SiO2 Sector 2 Sector 3 MgF2 SiO2 Sector 6 102 Experimental Results extracted from the April 2002 data: C @ 600 AMeV Sector 1 MgF2 SiO2 Sector 2 Sector 3 MgF2 SiO2 Sector 6 102 82 114 97 94 122 150 ?? L. Fabbietti (TU-München)

Conclusions and Outlook We have developed a powerful online efficiency measurement for the HADES Rich detector. The analysis of the single photon response has allowed to develop an heuristic model for the simulations. The quantitative comparison between experimental and simulated data enables an estimation of the figure of merit N0 for each sector of the HADES RICH detector. The OEM measurement is going to be repeated during the next experiment, to monitor the time evolution of the detector efficiency. Munich RICH group :T.Christ, T.Eberl, L.Fabbietti, J.Friese, R. Gernhaeuser, L.Maier, B.Sailer and S.Winkler. L. Fabbietti (TU-München)