Gießen 2024 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 41: Instrumentation XI

HK 41.3: Talk

Wednesday, March 13, 2024, 16:45–17:00, HBR 19: C 5a

Status of the PANDA Emc Barrel cooling system — •Thorsten Erlen, Kai-Thomas Brinkmann, and Hans-Georg Zaunick for the PANDA collaboration — II.Physikalisches Institut Justus Liebig Universität, Giessen, Deutschland

The Electromagnetic Calorimeter (EMC) of the future PANDA-Experiment at the FAIR complex in Darmstadt will use 2nd generation lead tungstate scintillator crystals (PWO II) to convert energy into a proportional amount of light in the visible spectrum. Two Large Area Avalanche Photo Diodes (LAAPD) per crystal are used to measure the amount of light created. Main characteristics of both the scintillator and the photosensors are temperature dependent. With decreasing temperature the light yield (photons per MeV) of the scintillators increases and the noise of the photosensors is reduced, while their gain-factor at a fixed voltage also increases. The nominal operating temperature for the EMC is -25 degree celsius to meet the desired properties and allow the EMC to perform according to the needs of the experiment. Energy resolution and threshold depend on a system that is capable of achieving and maintaining stable crystal and photosensor temperatures. Topic of this talk will be the results of test measurements with the first-in-its-kind slice (one of sixteen) for the barrel part of the calorimeter, using the latest (pre)production versions of the cooling, monitoring and front end electronic systems. Cooling and monitoring system design solutions will be presented in more detail.

Supported by BMBF

Keywords: Cooling System; Simulations; Enviroment control