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HK: Fachverband Hadronen und Kerne

HK 18: Accelerators and Instrumentation I

HK 18.8: Talk

Monday, March 16, 2009, 18:15–18:30, H-ZO 80

Studies on suface quality of PlexiGlas for a DIRC detector at the WASA-at-COSY experiment — •Adrian Schmidt¹, Christoph Adolph¹, Jens Bisplinghoff², Wolfgang Eyrich¹, Andreas Teufel¹, Cecilia Pizzolotto¹, 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. For the reconstruction of the Cherenkov angle of the light generated inside the DIRC radiator, it is necessary that the Cherenkov light is guided isogonal and with only minimal loss to the Photosensors. Most important in this context is a perfect surface texture. We present studies on optical properties of different finished PlexiGlas bars and show the results of a first DIRC prototype test at COSY.

supported by German BMBF and Forschungszentrum Jülich