Hamburg 2016 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 23: Postersitzung

T 23.11: Poster

Montag, 29. Februar 2016, 13:30–14:30, VMP4 Foyer

Characterization of Scintillating Plastic Fibers and Silicon Photomultipliers for their Usage in a Particle Telescope — •Lea Prüfer, Martin Losekamm, Thomas Pöschl, Daniel Greenwald, and Stephan Paul — Technische Universität München, 85748 Garching, Deutschland

The Multi-purpose Active-target Particle Telescope (MAPT) is a newly developed compact charged-particle detector. It can be used for space applications, such as radiation monitoring on spacecraft or for stratospheric research balloons.

Its core consists of scintillating plastic fibers coupled to silicon photomultiplier (SiPMs). The energy reconstruction of the incoming particles is based on an extended Bragg curve spectroscopy technique, requiring a good measurement of the energy deposition. Therefore, non-linearities of the measured light output -such as quenching effects of the scintillating material or saturation of the SiPMs at high light yields- have to be known quantitatively.

To investigate these effects, two scaled-down prototypes were built, consisting of 128 and 16 channels. The first one was tested at a stationary proton beam at Paul Scherrer Institute.

We determine Birk's coefficient describing the ionization quenching of the scintillator and calculate the characteristic photon detection efficiency of the SiPMs. We will explain the results of the first prototype tests and the characterization of the SiPMs. This research was supported by the DFG cluster of excellence "Origin and Structure of the Universe".