Speaker
Description
Diagonal-cut plane Beam Position Monitors (BPMs) are used to measure the transverse position of the proton beam in the Rapid Cycling Synchrotron (RCS) at the China Spallation Neutron Source (CSNS). Significant transverse beam position offsets were observed at several locations along the RCS. These offsets are potentially attributable to abrupt changes in the cross-section of the upstream and downstream vacuum ducts, BPM calibration constants determined at a single frequency on the calibration system, and limitations in the position calculation algorithm. To assess the impact of the sudden changes in beam duct aperture, numerical simulations were performed. Additionally, BPMs were recalibrated on a test bench to evaluate the influence of abrupt cross-sectional changes in the BPM and vacuum ducts on the observed offsets at different frequencies.
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