Performance of a nanometer resolution BPM system
Year: 2006
Type: report
Abstract: International Linear Collider (ILC) interaction region beam sizes and component position stability requirements will 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 beam-based stability measure- ments. It has been estimated that RF cavity beam position monitors (BPMs) could provide position measurement res- olutions of less than one nanometer and could form the ba- sis of the desired beam-based stability measurement. We have developed a high resolution RF cavity BPM system. A triplet of these BPMs has been installed in the extrac- tion line of the KEK Accelerator Test Facility (ATF) for testing with its ultra-low emittance beam. The three BPMs are rigidly mounted inside an alignment frame on variable- length struts which allow movement in position and angle. We have developed novel methods for extracting the posi- tion and tilt information from the BPM signals including a calibration algorithm which is immune to beam jitter. To date, we have been able to demonstrate a resolution of ap- proximately 20 nm over a dynamic range of +/- 20 microns. We report on the progress of these ongoing tests.
Authors: Walston, S., Chung, C., Fitsos, P., Gronberg, J., Meller, R., Vogel, V., Hayano, H., Honda, Y., Terunuma, N., Urakawa, J., Kolomensky, Y., Orimoto, T., Boogert, S., Frisch, J., May, J., McCormick, D., Ross, M., Smith, S., Smith, T., White, G., Slater, M., Thomson, M., Ward, D., Lyapin, A., Malton, S., Miller, D.
Institution: Lawrence Livermore National Laboratory
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funder: U.S. Department of Energy
OpenAlex ID: W2149677669