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T: Fachverband Teilchenphysik

T 41: DAQ, trigger and electronics II

T 41.8: Vortrag

Dienstag, 16. März 2021, 17:45–18:00, Tp

Large Area Avlanache Photodiode gain optimization — •Kim Tabea Giebenhain — Justus-Liebig-Universität, Gießen, Deutschland

The PANDA EMC, a calorimeter with high energy resolution, is an extremely important factor in reconstruction and particle identification, especially in the lower energy range. Its PWO-II crystals are read out with two Large Area Avalanche Photodiodes. Since the energy resolution and the noise of the LAAPDs depend on the bias voltage a study was done to find the optimal bias voltage in a range between 10 MeV and 2 GeV, using a single LAAPD and the APFEL ASIC preamplifiers. In order to simulate signals a LED-Pulser, planned for an online monitoring system, was used. Those light-pulser measurements indicate, that especially for energies below 1 GeV the energy resolution can be vastly improved by using much higher amplification than a standart gain of 150.