Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 5: Instrumentation II

HK 5.4: Talk

Monday, March 28, 2022, 15:00–15:15, HK-H4

Recovery study of lead tungstate scintillation crystals for the PANDA-EMC. — •Pavel Orsich¹, Valery Dormenev¹, Markus W. H. Moritz¹, Hans-Georg Zaunick¹, Kai-Thomas Brinkmann¹, and Mikhail Korjik² — ¹II. Physikalisches Institut, Justus-Liebig-Universität, Gießen — ²Institute for Nuclear Problems, Minsk, Belarus

Degradation of the optical transmittance of lead tungstate scintillation crystals in the scintillation spectral range under ionizing radiation leads to the loss of light output, which results in the deterioration of the energy resolution and limits the operation time of calorimeters made from the scintillator. This effect is especially prominent for calorimeters operating at low temperature, such as the Electromagnetic Calorimeter (EMC) of the PANDA experiment, where the calorimeter will be operated at -25 ^∘C to gain an additional factor four in light yield.
We report new results on stimulated recovery of radiation damage in lead tungstate scintillation crystals induced by an external source of infrared photons. This method allows fast and efficient in-situ recovery of the crystals optical transmittance either during beam-off periods or even online in parallel to data acquisition. The application of light for recovery can substantially extend the running period the PANDA-EMC by keeping the radiation damage at a tolerable level.
This work is supported by BMBF, GSI and HFHF.