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HK: Fachverband Physik der Hadronen und Kerne

HK 11: Instrumentation und Anwendungen I

HK 11.2: Talk

Monday, March 10, 2008, 17:00–17:15, 2C

Solid state photomultipliers for tracking detectors at Kaos — •Salvador Sanchez Majos, Patrick Achenbach, and Josef Pochodzalla — Inst. für Kernphysik, Joh. Gutenberg-Univ., Mainz

A solid state photomultiplier (SSPM) consists of a pixelized array of micrometric avalanche photodiodes connected in parallel. Despite the digital character of the signals from the individual pixels the device as a whole behaves analogically as long as the number of incoming photons remains small compared to the number of pixels. The highly uniform gain of the pixels allows for a clear photon number determination. This makes the device very suitable for low light yield detection insofar a mechanism is found to cope with the high dark rate characteristic of avalanche photodiodes.

In combination with scintillating fibres SSPM might provide a relatively cheap and reliable tracking detector operated with low voltage, magnetic field insensitive and minimal volume. The viability of this idea was studied for part of the electron arm tracking detector system of the KAOS spectrometer at MAMI-C. A similar concept is being considered for the PANDA time-of-flight start detector. Detection efficiency as a function of required pixels and time resolution have been measured for a two metres long, 0.89 mm diameter cylindrical fibre.