Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 53: Poster – Instrumentation
HK 53.16: Poster
Donnerstag, 22. März 2012, 14:00–16:00, P Foyer
APDs as Single-photon detectors for visible and near infrared wavelengths at SPECTRAP — Wladimir Buglak1, Volker Hannen1, •Raphael Jöhren1, Jonas Mader1, Wilfried Nörtershäuser2,3, 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, detectors with single-photon counting
capability in the visible and near-infrared regime are required. For the wavelength
region from 300 nm up to 1100 nm we investigate the performance of 2×2 mm2
silicon avalanche photo diodes (APDs) of type S0223 manufactured by Radiation Monitoring
Devices. To minimize thermal noise, the APDs are cooled to approximately -170∘C using
liquid nitrogen. By operating the diodes close to the breakdown voltage it is possible
to achieve gains in excess of 2·104. Extremely low-noise preamplifiers are used
to read out the devices. The poster will present recent measurements that have been obtained with
a gain of 2.2·104. At a discriminator threshold of 6 mV the resulting dark count rate is
in the region of 200 s−1 with a photodetection efficiency of (67±7)% at 628 nm.
Tests at 1020 nm result in a photodetection efficiency of (13 ± 3)% which, like the
results at shorter wavelength, is in the order of the APD’s quantum efficiency.
Supported by BMBF under contract number 06MS9152I.