POSSuMUS
b'The development of a modular designed large scale scintillation detector with a two-dimensional position\\nsensitivity is presented in this thesis. This novel POsition Sensitive Scintillating MUon SiPM\\nDetector is named POSSuMUS.\\nThe POSSuMUS detector is capable to determine the particle\\u2019s position in two space dimensions with\\na fast trigger capability. Each module is constructed from two trapezoidal shaped plastic scintillators\\nto form one rectangular shaped detector module. Both trapezoids are optically insulated against each\\nother. In both trapezoids the scintillation light is collected by plastic fibers and guided towards silicon\\nphotomultipliers (SiPMs). SiPMs are light sensors which are capable to detect even smallest amounts\\nof light. By combining several detector modules, position sensitive areas from 100 cm2 to few m2\\nare achievable with few readout channels. Therefore, POSSuMUS provides a cost effective detector\\nconcept.\\nThe position sensitivity along the trapezoidal geometry of one detector module is achieved by the\\npath length dependent amount of detected light for crossing particles. The ratio of the light yields\\nin both trapezoids is calculated. This value corresponds to the position of the particle traversing the\\ndetector. A spatial resolution in the order of several mm is foreseen. The position sensitivity along the\\nscintillator module is determined by the propagation time of light to the SiPMs located on opposite\\nsides of the detector. A spatial resolution of few cm is expected for this direction.\\nThe POSSuMUS detector is applicable as large area trigger detector with a two dimensional position\\ninformation of crossing particles. This is suitable in detector tests of large area precesion detectors or\\nfor measuring the small angle scattering of cosmic muons.\\nAt the beginning of this thesis, the determination of important SiPM characteristics like the breakdown\\nvoltage is presented. In the course of this work the detector principle is proven by the test of the\\nfirst prototype detector with straight tracks during an experiment at CERN. In particular, a position\\nsensitivity in both directions is demonstrated. After this experiment the detector development focuses\\non the enhancement of the amount of detected light per event. Here several studies with results are\\npresented.\\nThe gained knowledge is realized in a second prototype detector, whereby the results of straight and\\ninclined tracks are presented. A position sensitivity due to the trapezoidal geometry is obtained, with\\na spatial resolution of up to 13 mm.\\nThis thesis concludes with an outlook on the ongoing developments and to the future use of the POSSuMUS detector.'