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HK: Fachverband Physik der Hadronen und Kerne

HK 72: Poster

HK 72.29: Poster

Thursday, March 14, 2024, 17:15–18:45, HBR 14: Foyer

Stimulated recovery for PWO-based electromagnetic calorimetry — •Pavel Orsich, Valery Dormenev, Hans-Georg Zaunick, and Kai-Thomas Brinkmann for the PANDA collaboration — II. Physikalisches Institut, Justus-Liebig-Universität, Gießen

Lead tungstate based calorimeters under ionizing radiation exhibit a degradation of optical transmittance and, as the result, deterioration of the energy resolution. Notably, this effect is more pronounced in calorimeters operating at low temperatures.
One technique to minimize the effect of radiation-induced damage of PWO crystals involves stimulated recovery. Stimulated recovery is achieved by illuminating the crystal with optical light of a specific wavelength. This approach enables rapid and effective in-situ restoration of the crystal’s optical transmittance. Implementation occurs either during periods when the beam is inactive, using blue light, or in real-time during data acquisition using near-infrared light. Employing stimulated recovery has the potential to significantly prolong the operational period of PWO-based calorimeters, particularly those operating at low temperatures, by controlling radiation damage within acceptable levels.
This project is supported by BMBF and HFHF.

Keywords: calorimetry; lead tungstate; radiation damage; stimulated recovery