Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 52: Poster - Instrumentation I

HK 52.29: Poster

Mittwoch, 6. März 2013, 16:45–19:00, HSZ 2.OG

Characterization of APDs for single photon counting — Wladimir Buglak¹, Volker Hannen¹, Raphael Jöhren¹, •Martin Surholt¹, Jonas Vollbrecht¹, Wilfried Nörtershäuser^2,3, Rodolfo Sánchez³, and Christian Weinheimer¹ — ¹Institut für Kernphysik, Universität Münster — ²Institut für Kernchemie, Universität Mainz — ³GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt

For the SPECTRAP experiment at GSI, Germany, a detector system with single-photon counting capability operating in the wavelength region from 300 nm up to 1100 nm has been developed at the University of Münster. The detector system utilises a silicon avalanche photo diode (APD) cooled to liquid nitrogen temperatures and operated near the breakdown voltage to obtain high gain values. While the current setup uses a 2×2 mm² APD (type RMD S0223), it would be advantageous to have a larger active area for easier adjustment of the experiment optics. On the other hand a larger active area is accompanied by increased thermal noise which might harm the photon counting performance of the device. The characterization of a 8×8 mm² APD (RMD S0814) is the subject of this poster.
Furthermore a signal analysis software was developed to supress noise signals, e.g. caused by microphonic effects. The software processes signal waveforms recorded by a Flash ADC and should allow for a lower trigger threshold and thus higher detection efficiency.
Supported by BMBF under contract number 06MS7191.