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HK: Fachverband Hadronen und Kerne

HK 75: Accelerators and Instrumentation I

HK 75.3: Talk

Thursday, March 19, 2009, 17:15–17:30, H-ZO 80

Beam test of Lead Tungstate Crystals at ELSA, Bonn — •Florian Feldbauer — Ruhr-Universität Bochum, Germany

An electromagnetic calorimeter (EMC) consisting of about 16000 lead tungstate (PWO) crystals is developed for the PANDA experiment at the antiproton storage ring HESR at the future accelerator facility FAIR at Darmstadt. The high density and short decay time of lead tungstate allows the construction of a very compact calorimeter for high luminosity operation at PANDA. At the runtime of PANDA the crystals will be exposed to up to 30 mGy/h. The most common radiation damage is due to color center formation. Color centers affect the light transparency of the crystals, resulting in reduced light output. Therefore a precise study of possible radiation damage effects is mandatory. At the electron stretcher facility ELSA in Bonn PWO crystals of the latest generation are irradiated with high energetic electrons at count rates comparable to the highest expected rates in the PANDA calorimeter. The loss of crystal transparency is monitored with LED-Pulsers. The corresponding reduction in crystal light yields is recorded by measuring the energy loss spectrum of cosmic muons passing the crystals.

Supported by BMBF and EU.