Author: Kucharczyk, K.
Paper Title Page
Recent Developments of the Soft X-ray Beam Position Monitor Project  
  • B. Podobedov, D.M. Bacescu, C. Eng, S. Hulbert, C. Mazzoli, C.S. Nelson
    BNL, Upton, New York, USA
  • D. Donetski, K. Kucharczyk, J. Liu, R. Lutchman
    Stony Brook University, Stony Brook, New York, USA
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
A novel soft X-ray BPM (sXBPM) for high-power white beams of undulator radiation is being developed through a joint effort of BNL/NSLS-II and Stony Brook University. In our approach, custom-made multi-pixel GaAs detector arrays are placed into the outer portions of the x-ray beam, and the beam position is inferred from the pixel photocurrents. In this paper, we present a brief overview and the most recent developments in our project. To date, the mechanical design of the system is completed and most of the vacuum and mechanical components have been installed into the 23-ID canted undulator beamline first optical enclosure. The remainder of the system, including the detector arrays, are being installed during the upcoming NSLS-II machine shutdown. The GaAs detectors have been designed, fabricated, and tested in the visible range with a high-power Ar-ion laser as well as in the soft and hard x-ray regions at two NSLS-II beamlines.
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