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

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• 作者：Sean Walston ; Stewart Boogert ; Carl Chung ; Pete Fitsos ; Joe Frisch ; Jeff Gronberg ; Hitoshi Hayano ; Shantell Hinton ; Yosuke Honda ; Oleg Khainovski ; Yury Kolomensky ; Peter Loscutoff ; Alexey Lyapin ; Stephen Malton ; Justin May ; Douglas McCormick ; Robert Meller ; David Miller ; Toyoko Orimoto ; Marc Ross ; et al.
• 关键词：Cavity Beam Position Monitor (BPM) ; Accelerator Test Facility (ATF) ; International Linear Collider (ILC)
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2013
• 出版时间：11 November, 2013
• 年：2013
• 卷：728
• 期：Complete
• 页码：53-58
• 全文大小：2512 K

文摘

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.