Beam Position Monitor Characterization for the High Energy Photon Source Synchrotron

Beam position monitor (BPM) characterization has been widely studied at the synchrotron. The characteristic impedance of a stripline BPM was designed using a simulation and measured using the time-domain reflectometer method. The mechanical and electrical parameters of the feedthroughs with the buttons used for the BPMs were measured. Special care was taken in the analysis of the consistency of the four channels of the BPM. The feedthroughs were sorted based on their capacitance values. This paper presents the characterization results of the feedthroughs and BPMs. The electro-mechanical offsets were measured using the Lambertson method, and the calibration coefficients were measured using a stretched wire. The BPM differences introduced during mass production were determined by a statistical analysis of the measurement results.

Automated summary

This paper presents the study of the characterization of beam position monitor (BPM) at the synchrotron. The characteristic impedance of stripline BPM was designed and measured using simulation and time-domain reflectometer method. The mechanical and electrical parameters of the feedthroughs for BPMs were measured, and the consistency of the four channels of BPM was analyzed carefully. The feedthroughs were sorted based on their capacitance values. The paper also presents the characterization results of feedthroughs and BPMs. The electro-mechanical offsets were measured using the Lambertson method, and the calibration coefficients were measured using a stretched wire. The statistical analysis of measurement results determined the BPM differences introduced during mass production.