Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 18: Accelerators and Instrumentation I

HK 18.7: Talk

Monday, March 16, 2009, 18:00–18:15, H-ZO 80

Studies on different MaPMTs for a DIRC detector at the WASA-at-COSY experiment — •Christoph Adolph¹, Jens Bisplinghoff², Wolfgang Eyrich¹, Andreas Teufel¹, Cecilia Pizzolotto¹, Adrian Schmidt¹, Christian Vogel¹, Regina Siudak², and Kai Ulbrich² — ¹Physikalisches Institut IV der Universität Erlangen-Nürnberg — ²Helmholtz Institut für Strahlen- und Kernphysik Universität Bonn

The WASA-at-COSY experiment at the Forschungszentrum Jülich provides a nearly 4π detector including a forward spectrometer for studies on η− and η′−meson decays in proton-proton collisions. Simulations have shown that an additional Detector of Internaly Reflected Cherenkov light (DIRC) in front of the Forward Range Hodoscope will significantly increase the particle identification and energy resolution for both the decayed particles and the background. The light generated inside the DIRC radiator is guided under total internal reflection towards the edge of the radiator where it is focused on a photon readout system by a special optic. For the reconstruction of the Cherenkov angle the photon readout system needs a good spatial resolution. This can be achieved by multi-anode photomultipliers (MaPMT). We report on studies of the characteristics of different MaPMTs (Hamamatsu Type H8500C, H9500 and H6568) and on results from a first test of a DIRC prototype at COSY.

supported by German BMBF and Forschungszentrum Jülich