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

作者：Walston Sean^*; Boogert Stewart; Chung Carl; Htsos Pete; Frisch Joe; Gronberg Jeff; Hayano Hitoshi; Hinton Shantell; Honda Yosuke; Khainovski Oleg; Kolomensky Yury; Loscutoff Peter; Lyapin Alexey; Malton Stephen; May Justin; McCormick Douglas; Meller Robert; Miller David; Orimoto Toyoko; Ross Marc; Slater Mark; Smith Steve; Smith Tonee; Terunuma Nobuhiro; Thomson Mark; Urakawa Junji; Vogel Vladimir; Ward David; White Glen

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2013, 728: 53-58.

DOI：10.1016/j.nima.2013.05.196

• Cavity Beam Position Monitor (BPM)
• Accelerator Test Facility (ATF)
• International Linear Collider (ILC)

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.

• 出版日期2013-11-11