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Published July 21, 2007 | public
Journal Article

Performance of a High Resolution Cavity Beam Position Monitor System

Abstract

It has been estimated that an RF cavity Beam Position Monitor (BPM) could provide a position measurement resolution of less than 1 nm. We have developed a high resolution cavity BPM and associated electronics. A triplet comprised of these BPMs was installed in the extraction line of the Accelerator Test Facility (ATF) at the High Energy Accelerator Research Organization (KEK) for testing with its ultra-low emittance beam. The three BPMs were each rigidly mounted inside an alignment frame on six variable-length struts which could be used to move the BPMs in position and angle. We have developed novel methods for extracting the position and tilt information from the BPM signals including a robust calibration algorithm which is immune to beam jitter. To date, we have demonstrated a position resolution of 15.6 nm and a tilt resolution of 2.1μrad over a dynamic range of approximately ±20μm.

Additional Information

© 2007 Elsevier. Received 6 February 2007, Revised 6 April 2007, Accepted 25 April 2007, Available online 1 May 2007. We wish to thank the operators and support staff at the ATF for all of their kind help and invaluable expertise during these experiments. This work was supported in part by the US Department of Energy under Contract DE-FG02-03ER41279. This work was supported by the Commission of the European Communities under the 6th Framework Programme "Structuring the European Research Area," contract number RIDS-011899. This work was supported by the National Science Foundation. This work was performed under the auspices of the U.S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under contract W-7405-Eng-48. This work was supported by the U.S. Department of Energy under contract DE-AC02-76SF00515. This work was supported by the Japan-USA Collaborative Research Grant, Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science.

Additional details

Created:
August 22, 2023
Modified:
October 25, 2023