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T: Fachverband Teilchenphysik

T 64: Halbleiterdetektoren: Forschung und Entwicklung 2

T 64.2: Talk

Tuesday, February 28, 2012, 17:00–17:15, ZHG 001

Studies on afterpulses and saturation of SiPM with fast UV light pulses — •Marco Szalay — Max-Planck-Institut für Physik, München — Technische Universität München

Arrays of novel avalance photodiodes operated in geiger mode called Silicon Photo Multipliers (SiPM) are capable of detecting light with single photon detection efficiency. Their smaller form factor and insensitivity to magnetic fields make them an interesting alternative to photomultiplier tubes (PMT) in fields ranging from medical imaging to high energy physics.

In this talk, the time structure of signals from a SiPM device, standalone and coupled to a plastic scintillator, is investigated. The time distribution of single photons created by short-pulsed intensity-controlled UV light sources and detected by the SiPM device is reconstructed on a per event basis. By decomposing the recorded waveforms into individual geiger discharges one can obtain the time of arrival with nanosecond precision. This way late components of the signal shape like afterpulses and instantaneous and delayed contributions from the scintillator can be disentangled. The precision of the measurement of the SiPM saturation was optimized and can be used for calibration in order to recover the linearity of such devices on a broader intensity range.