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Title: Betatron phase and nonlinear lattice correction

Abstract

Betatron phase measured from excited oscillation can be used to correct the beta function and the nonlinear lattice. With an improved algorithm the measurement precision has achieved 1 mrad (rms), or equivalently, 0.3% of beta beat at NSLS-II. The beta beating can be corrected to 1% in less than half an hour. This precise technique can be applied to the nonlinear lattice correction as well. The betatron phase probed by an off-axis beam provides information on the sextupole strength. In comparison with the model the nominal strength can be restored. It was shown that the proposed scheme treated all the leading order resonance driving terms generated by sextupoles, as well as the detuning terms and the nonlinear chromaticity. In conclusion, at NSLS-II a half percent sextupole correction led to a 15% increase of the dynamic aperture.

Authors:
; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1463928
Alternate Identifier(s):
OSTI ID: 1475164
Report Number(s):
BNL-209095-2018-JAAM
Journal ID: ISSN 2469-9888; PRABCJ; 081001
Grant/Contract Number:  
AC02-98CH10886; SC0012704
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams Journal Volume: 21 Journal Issue: 8; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Guo, Weiming, Hidaka, Yoshiteru, Willeke, Ferdinand, and Yang, Xi. Betatron phase and nonlinear lattice correction. United States: N. p., 2018. Web. doi:10.1103/PhysRevAccelBeams.21.081001.
Guo, Weiming, Hidaka, Yoshiteru, Willeke, Ferdinand, & Yang, Xi. Betatron phase and nonlinear lattice correction. United States. doi:10.1103/PhysRevAccelBeams.21.081001.
Guo, Weiming, Hidaka, Yoshiteru, Willeke, Ferdinand, and Yang, Xi. Fri . "Betatron phase and nonlinear lattice correction". United States. doi:10.1103/PhysRevAccelBeams.21.081001.
@article{osti_1463928,
title = {Betatron phase and nonlinear lattice correction},
author = {Guo, Weiming and Hidaka, Yoshiteru and Willeke, Ferdinand and Yang, Xi},
abstractNote = {Betatron phase measured from excited oscillation can be used to correct the beta function and the nonlinear lattice. With an improved algorithm the measurement precision has achieved 1 mrad (rms), or equivalently, 0.3% of beta beat at NSLS-II. The beta beating can be corrected to 1% in less than half an hour. This precise technique can be applied to the nonlinear lattice correction as well. The betatron phase probed by an off-axis beam provides information on the sextupole strength. In comparison with the model the nominal strength can be restored. It was shown that the proposed scheme treated all the leading order resonance driving terms generated by sextupoles, as well as the detuning terms and the nonlinear chromaticity. In conclusion, at NSLS-II a half percent sextupole correction led to a 15% increase of the dynamic aperture.},
doi = {10.1103/PhysRevAccelBeams.21.081001},
journal = {Physical Review Accelerators and Beams},
number = 8,
volume = 21,
place = {United States},
year = {2018},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevAccelBeams.21.081001

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