Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 4: Instrumentation 3

HK 4.4: Vortrag

Montag, 23. März 2015, 15:15–15:30, M/HS4

Performance of a Prototype for Stimulated Recovery of Radiation Damage for the PANDA EMC Forward Endcap and Barrel — •Till Kuske, Valera Dormenev, Rainer Novotny, and Hans-Georg Zaunick — II. Physikalisches Institut Justus-Liebig Universität

The future Electromagnetic Calorimeter (EMC) of the PANDA detector at FAIR will be based on a new generation of lead tungstate crystals (PWO-II). It is optimized to measure particle energies from 10 GeV down to 10-20 MeV. The operating temperature of the EMC will be -25*C. Due to the operation in a strong radiation environment one of the most critical parameter of PWO-II is radiation hardness. The radiation damage of PWO-II can be compensated by spontaneous relaxation of the color centers via thermo-activation. The process is strongly suppressed at -25°C, which is limiting the energy resolution of the EMC. The recovery process can be accelerated by illumination of the crystal with light even in the infrared region. A prototype implementation of the stimulated recovery for the PANDA EMC forward endcap is shown. Detailed studies concerning flux and intensity for different recovery modes at -25°C are presented. Additionally a concept for the recovery of radiation damage in the barrel part of the EMC will be discussed.

This work has been supported by BMBF and HIC-for-FAIR.