Mainz 2022 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 5: Instrumentation II

HK 5.5: Vortrag

Montag, 28. März 2022, 15:15–15:30, HK-H4

Serial calibration of the slow-control of the barrel part of the PANDA EMC front-end bus system* — •Christopher Hahn for the PANDA collaboration — II. Physikalisches Institut, Gießen, Deutschland

One of the main components of the upcoming PANDA experiment at the future FAIR complex in Darmstadt will be the Electromagnetic Calorimeter (EMC) inside a 2 T solenoid. The EMC's lead-tungstate crystals are read out by Large Area Avalanche Photodiodes (LAAPDs). Due to the required energy resolution, timing and spacial constraints, the individual bias voltage adjustments for the Photodiodes need to be accurate and stable on a level of 100 mV. At the same time, space constraints in the inner detector volume limit options for individual cable routing and connections for the LAAPD bias voltage. These constraints demanded new, innovative and specialized electronics to adjust the individual LAAPD voltage within the inner detector volume. The key elements of the high-voltage adjustment concept will be described. To enable a stable operation of the specialized electronics within a broad temperature window, tests of the slow-control electronics were conducted. First results of these preproduction tests and conclusions leading towards an automated calibration algorithm will be presented in this talk. *gefördert durch das BMBF, GSI und HFHF.