Speaker
Description
A novel soft X-ray BPM (sXBPM) for high-power white beams of synchrotron undulator radiation has been developed through a joint effort by BNL/NSLS-II and Stony Brook University. In this approach, custom-made multi-pixel GaAs detector arrays are positioned in the outer portions of the X-ray beam, with beam position inferred from the pixel photocurrents. The first R&D device, installed in the white beam of C23-ID beamline ~26 m downstream of the EPU source, has demonstrated sub-micron positional resolution without interfering with user experiments, including the most sensitive ones exploiting the beam's coherent properties. Beyond positional measurements, the sXBPM effectively monitors the beam's cross-sectional shapes at the array locations during operations and can capture the entire 2D cross-sections of the X-ray beam during dedicated studies. This paper reviews the sXBPM design and highlights the latest experimental results, demonstrating why this approach is well-suited for XBPMs in future light sources with highly coherent X-ray beams.
Funding Agency
Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
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