Mainz 2014 – scientific programme

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T: Fachverband Teilchenphysik

T 57: Myondetektoren 1

T 57.2: Talk

Tuesday, March 25, 2014, 17:00–17:15, P12

Scintillating Detector with SiPM Readout for Spatial Resolution of Cosmic Muons — •Ralph Müller, Otmar Biebel, Johannes Grossmann, Ralf Hertenberger, and Alexander Ruschke — LMU München

A modularized plastic scintillating detector consisting of two optically separated trapezoids is investigated for two dimensional spatial resolution with trigger capability.
Scintillation light of cosmic muons is collected by wavelength shifting fibers (WLSFs) and guided to Silicon Photo-Multiplieres (SiPMs).
The position resolution in one direction is achieved by the propagation time of light from the point of creation to the SiPMs on both sides of the module. For the second coordinate one compares the light yield of the two detector halves. The light yield is proportional to the path length of the muon in trapezoid.
Since the spatial resolution depends on the amount of scintillation light detected by the SiPMs, diffuse and specular reflected cover materials have been compared by simulation and measurement.
Also the trapezoidal shape and the fiber positions have been optimized. Simulation studies promise a much enhanced spatial resolution compared to the first prototype.