Abstract
Abstract
In this study, we describe the fabrication of an
electrostatic beam position monitor (BPM) for beam diagnostic
systems. Calibration of the BPM pickup requires both sensitivity and
curve fitting owing to manufacturing tolerances following
fabrication. To calibrate the BPM, we developed a BPM calibration
system that comprises a wire-based test bench and readout
electronics. We considered three difference-over-sum (DOS) data
selection methods: DOSdiag, DOSaxis, and
DOSall, to understand their impact on calibration
accuracy. Each method selected specific DOS data, and we compared
their characteristic curves. Consequently, we analyzed the
calibration results by performing linear, 3rd-order, 5th-order, and
two-dimensional (2D) 3rd-order polynomial fitting. Each of the three
DOS data selection methods was examined to illustrate their
advantages and limitations in terms of calibration accuracy and
required amount of data. The results obtained demonstrated that
choosing the appropriate DOS data-selection approach could be
employed for the BPM offline calibrations, achieving minimized
calibration errors and optimized response characteristics with
polynomial curve fitting.