Abstract
A phase space beam position and size monitor (ps-BPM) system was introduced previously to measure the electron source vertical position and angular motion along with the vertical source size and angular size at a single location in a synchrotron bend magnet beam line. The system was validated experimentally at the Canadian Light Source and demonstrated by a simulation that it is suitable for low-emittance light sources. In this work, the potential practicality of the ps-BPM system is explored with real-case studies. By combining the analysis in the time and frequency domain, information on the beam motion and size can be extracted and identified from both the source and the beam-line optics. Applications of the ps-BPM system at the Canadian Light Source are demonstrated by studying beam vibrations and machine insertion device field changes. Results of these studies provide guidelines for implementing a dedicated ps-BPM system at existing and planned synchrotron facilites.
Highlights
Accurate measurements of the electron source size and divergence are becoming increasingly important at synchrotron facilities as the next-generation light sources are being built with the goal of achieving the smallest possible emittance [1,2].Currently available ways of measuring the source size are relying on direct imaging or interference-based techniques
The power spectral distribution (PSD) functions for Dσy0 and σbeam show clear frequency peaks that are consistent with the ones observed in the position plots [see Fig. 3(b)], which is an indication of adequate sensitivity
We have shown how to use the phase space beam position and size monitor (ps-BPM) system to characterize source properties
Summary
Accurate measurements of the electron source size and divergence are becoming increasingly important at synchrotron facilities as the next-generation light sources are being built with the goal of achieving the smallest possible emittance [1,2]. This profile is fit with a Gaussian function from which the center location of the photon beam, ybeam, and the Gaussian distribution width σbeam is obtained. A spatial derivative is taken of this step function forming a peak that is fit by a Gaussian function from
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