Münster 2017 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 64: Experimentelle Techniken der Astroteilchenphysik 3
T 64.7: Vortrag
Dienstag, 28. März 2017, 18:15–18:30, VSH 18
Silicon Photomultipliers (SiPM) in a Liquid Xenon Time Projection Chamber (TPC) — •Christopher Hils1, Matteo Alfonsi1, Andrea Brogna2, Daniel Wenz1, and Uwe Oberlack1,2 — 1Johannes Gutenberg-Universität Mainz — 2PRISMA Detektor Labor, Johannes Gutenberg-Universität Mainz
SiPMs are solid state light sensors with single photon count capabilities. With properties similar to the commonly used photomultiplier tubes (PMTs), they provide a higher granularity, they are operated at a much lower bias voltage and have possibly a smaller cost per area. A low background experiment like a liquid xenon TPC also benefits from their much smaller mass and dimensions. Xenon is scintillating in the VUV regime at 178nm, but most commercially available SiPMs are not sensitive at this wavelength. To increase sensitivity the SiPMs have to undergo a special treatment, in which the inactive entrance layer on top of the SiPM is thinned. We designed and built a test stand to observe the operational stability and to measure the sensitivity, crosstalk and afterpulse properties of VUV-sensitive SiPMs in liquid xenon. We use a 241Am source immersed in liquid xenon to provide scintillation light and are able to examine three SiPM samples and a 1" PMT for reference simultaneously.