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KATRIN
Abstract:
The focus of this thesis was to design the first mechanical model for ComPol- ISS, that meets all space-constraints, while addressing the background of optical photons. For the first time all individual components were combined into a single CAD model. The assembly approach of the resulting stacked setup was verified with a 3D-printed mock-up. It is space-compatible and in principle ready for production. Even though a change of the design is decided for the future implementation, most of the current design solutions can be reused. This also includes the multi-staged light mitigation, whose central component is a dedicated aluminum housing around the detectors. This detector light shield was evaluated and improved in an iterative design loop, eliminating the light leaks. The final version is able to suppress the light of a laboratory LED to 1.3% above the dark rate, however, it is not light-tight for the illumination with 34% of the solar intensity. While all previously addressed leak sources are confirmed to stay light tight, the PCBs themselves are identified to be the major leakage source, resulting in an excess of 66.1%. By covering the PCB face, the relative light excess is reduced to 4.7%. It needs to be evaluated in the future, if the all light shielding components together result in a reasonable low excess or if the PCB must be shielded by additional means.
