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Published November 11, 2013 | public
Journal Article

A metrology system for a high resolution cavity beam position monitor system

Abstract

International Linear Collider (ILC) interaction region beam sizes and component position stability requirements will likely be as small as a few nanometers. It is important to the ILC design effort to demonstrate that these tolerances can be achieved–ideally using a beam-based stability measurement. We developed a high resolution RF cavity Beam Position Monitor (BPM) system. A triplet of these BPMs, installed in the extraction line of the KEK Accelerator Test Facility (ATF) and tested with its ultra-low emittance beam, achieved a position measurement resolution of 15 nm. A metrology system for the three BPMs was subsequently installed. This system employed optical encoders to measure each BPM's position and orientation relative to a zero-coefficient of thermal expansion carbon fiber frame. We have demonstrated that the three BPMs behave as a rigid-body at the level of less than 5 nm.

Additional Information

© 2013 Elsevier B.V. Received 16 May 2013; Accepted 28 May 2013; Available online 21 June 2013. 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 US Department of Energy by the University of California, Lawrence Livermore National Laboratory under Contract W-7405-Eng-48. This work was supported by the US 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. We wish to thank the operators and support staff at the ATF for all of their kind help and invaluable expertise during these experiments.

Additional details

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