München 2019 – wissenschaftliches Programm
HK 54.62: Poster
Donnerstag, 21. März 2019, 16:30–19:00, Foyer Theresanium
Radiation damage and recovery studies with lead tungstate scintillators of the PANDA Target Calorimeter — •Pavel Orsich1, Kai-Thomas Brinkmann1, Valera Dormenev1, Rainer-Willi Novotny1, Hans-Georg Zaunick1, Till Kuske1, Vitaly Mechinski2, and Mikhail Korzhik2 for the PANDA collaboration — 12nd Physics Institute JLU, Giessen, Germany — 2Institute for Nucleans Problems BSU, Minsk, Belarus
The PANDA detector is a new detector system which will be installed at the international FAIR accelerator facility (Darmstadt, Germany) with a wide research program. One of the major detector components will be the Electromagnetic Target Calorimeter (EMC) based on second generation lead tungstate scintillation crystals (PWO-II). The operating temperature of the PANDA EMC was chosen as -25o C.
The consequence of radiation damage in PWO is the degradation of optical transmittance. This leads to light collection losses and results in the degradation of energy resolution of the EMC in general. In particular, the impact is critical at low temperatures, whose spontaneous recovery processes are suppressed or frozen. To minimize radiation induced damages during operation, a LED based stimulated recovery is foreseen.
A experimental setup to study stimulated recovery was developed. Test results of radiation damage annealing via stimulated recovery will be shown.
This project is supported by BMBF and HIC for FAIR.