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Linear Collider Test Facility [electronic resource] : Twiss Parameter Analysis at the IP/Post-IP Location of the ATF2 Beam Line

Published
Washington, D.C. : United States. Dept. of Energy. Office of Science, 2012.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators
SLAC National Accelerator Laboratory, United States. Department of Energy. Office of Science, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
At the first stage of the ATF2 beam tuning, vertical beam size is usually bigger than 3 {micro}m at the IP. Beam waist measurements using wire scanners and a laser wire are usually performed to check the initial matching of the beam through to the IP. These measurements are described in this paper for the optics currently used (βₓ = 4cm and β{sub y} = 1mm). Software implemented in the control room to automate these measurements with integrated analysis is also described. Measurements showed that β functions and emittances were within errors of measurements when no rematching and coupling corrections were done. However, it was observed that the waist in the horizontal (X) and vertical (Y) plane was abnormally shifted and simulations were performed to try to understand these shifts. They also showed that multiknobs are needed in the current optics to correct simultaneously αₓ, α{sub y} and the horizontal dispersion (Dₓ). Such multiknobs were found and their linearity and orthogonality were successfully checked using MAD optics code. The software for these multiknobs was implemented in the control room and waist scan measurements using the α{sub y} knob were successfully performed.
Report Numbers
E 1.99:slac-pub-15137
slac-pub-15137
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Note
Published through SciTech Connect.
07/02/2012.
"slac-pub-15137"
Conf.Proc.C100523:THPD077,2010
1st International Particle Accelerator Conference: IPAC'10, 23-28 May 2010, Kyoto, Japan.
Bolzon, Benoit; Jeremie, Andrea; Bambade, Philip; White, Glen; Bai, Sha.
Funding Information
AC02-76SF00515
View MARC record | catkey: 14676087