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Muon g-2 experiment: light distribution for the calibration system

In this thesis contribution to achieving a higher precision of Muon 𝑔 − 2 experiment is described. Fermilab’s Muon 𝑔−2 experiment (FNAL E989) goal is to get four-fold better precision compared to BNL E821 experiment i.e. to get overall experimental accuracy of 0, 14 ppm. This will allow insight into the subatomic world to search for undiscovered particles that may be hiding in the vacuum, and hence it will probe fundamental properties of matter and space, and consequently examine completeness of the SM. To achieve higher precision, it is necessary to reduce systematic error of the detector, which will be used to detect positrons produced in a muon decay. Calorimeter is detector’s main component for measuring energy and time of arrived positrons, hence the calibration of the calorimeter is required. The calorimeter type and design have been already optimized by previous experiments, hence, it was necessary to “deliver” light to the calorimeter in accurate way. A candidate light distribution system for calibration of the calorimeter was developed and tested. Proper light distribution was obtained using precisely designed mechanical system with laser beam splitters. Its design is based on use of the beam splitters with various reflectivities and fiber splitter for initial distribution. Using properly and precisely distributed calibration signal i.e. laser pulses, will decrease systematic error of the measurement and thus increase precision of the whole experiment.

Optics ; Lasers ; Detector alignment and calibration methods ; Muon g-2 experiment

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