Libera Brilliance+ is a device used for acquisition and signal processing for
Beam Position Monitoring applications in particle accelerators. Each device requires
passing the factory acceptance test before integration into accelerator system.
Factory acceptance test, among others, consists of the long-term measurement,
where, under constant ambient conditions, slow and monotonic drift of position
calculation can be observed. The drift phenomena often lasts more than a day or two
and amounts to bottleneck in throughput capacity of the quality control department.
Goal of the master's thesis was first to perform an in-depth study of beam
position monitoring principles (BPM), describe main building blocks of BPM
systems and thoroughly analyze the drift effect and identify the underlying causes
that result in problematic phenomena. The goal was also to propose remedial
strategies to minimize position calculation long-term instability.
The first chapter contains a brief explanation of the particle accelerators, signal
processing theory and beam position monitoring theory of operation. Description of
Libera Brilliance+ device is also included. Following chapter accounts the
problematic drift effect. Third chapter describes measurements and experiments
performed in order to find out the cause problematic drift. The final chapter provides
theoretical insight to the findings and summarizes the paper.
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