Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8177335 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2014 | 7 Pages |
Abstract
The Shintake Monitor is an essential beam tuning device installed at the interaction point (IP) of ATF2 [1], the final focus test beam line of the Accelerator Test Facility (ATF) to measure its nanometer order vertical eâ beam sizes (Ïyâ). The eâ beam collides with a target of laser interference fringes, and Ïyâ is derived from the modulation depth of the resulting Compton signal photons measured by a downstream photon detector. By switching between several laser crossing angle modes, it is designed to accommodate a wide range of Ïyâ from 20Â nm to a few micrometers with better than 10% accuracy. Owing to this ingenious technique, Shintake Monitor1[2], [3] is the only existing device capable of measuring Ïyâ<100Â nm, and is crucial for verifying ATF2's Goal 1 of focusing Ïyâ down to the design value of 37Â nm. Shintake Monitor has demonstrated stable Ïyâ measurement with 5-10% stability. Major improvements in hardware and measurement schemes contributed to the suppression of error sources. This paper describes the design concepts and beam time performance of Shintake Monitor, as well as an extensive study of systematic errors with the aim of precisely extracting Ïyâ from the measured modulation.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Instrumentation
Authors
Jacqueline Yan, Yohei Yamaguchi, Yoshio Kamiya, Sachio Komamiya, Masahiro Oroku, Toshiyuki Okugi, Nobuhiro Terunuma, Kiyoshi Kubo, Toshiaki Tauchi, Junji Urakawa,