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Title: Optimization methodology for the global 10 Hz orbit feedback in RHIC

Abstract

To combat beam oscillations induced by triplet vibrations at the Relativistic Heavy Ion Collider (RHIC), a global orbit feedback system was developed and applied at injection and top energy in 2011, and during beam acceleration in 2012. Singular Value Decomposition (SVD) was employed to determine the strengths and currents of the applied corrections. The feedback algorithm was optimized for different magnetic configurations (lattices) at fixed beam energies and during beam acceleration. While the orbit feedback performed well since its inception, corrector current transients and feedback-induced beam oscillations were observed during the polarized proton program in 2015. In this paper, we present the feedback algorithm, the optimization of the algorithm for various lattices and the solution adopted to mitigate the observed current transients during beam acceleration.

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1438429
Report Number(s):
BNL-204652-2018-JAAM
Journal ID: ISSN 0168-9002
Grant/Contract Number:
SC0012704
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 898; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; Orbit correction; Orbit feedback; Triplet vibration; Singular value decomposition (SVD); Eigenvalue; Tikhonov regularization

Citation Formats

Liu, Chuyu, Hulsart, R., Mernick, K., Michnoff, R., and Minty, M. Optimization methodology for the global 10 Hz orbit feedback in RHIC. United States: N. p., 2018. Web. doi:10.1016/j.nima.2018.05.001.
Liu, Chuyu, Hulsart, R., Mernick, K., Michnoff, R., & Minty, M. Optimization methodology for the global 10 Hz orbit feedback in RHIC. United States. doi:10.1016/j.nima.2018.05.001.
Liu, Chuyu, Hulsart, R., Mernick, K., Michnoff, R., and Minty, M. Tue . "Optimization methodology for the global 10 Hz orbit feedback in RHIC". United States. doi:10.1016/j.nima.2018.05.001.
@article{osti_1438429,
title = {Optimization methodology for the global 10 Hz orbit feedback in RHIC},
author = {Liu, Chuyu and Hulsart, R. and Mernick, K. and Michnoff, R. and Minty, M.},
abstractNote = {To combat beam oscillations induced by triplet vibrations at the Relativistic Heavy Ion Collider (RHIC), a global orbit feedback system was developed and applied at injection and top energy in 2011, and during beam acceleration in 2012. Singular Value Decomposition (SVD) was employed to determine the strengths and currents of the applied corrections. The feedback algorithm was optimized for different magnetic configurations (lattices) at fixed beam energies and during beam acceleration. While the orbit feedback performed well since its inception, corrector current transients and feedback-induced beam oscillations were observed during the polarized proton program in 2015. In this paper, we present the feedback algorithm, the optimization of the algorithm for various lattices and the solution adopted to mitigate the observed current transients during beam acceleration.},
doi = {10.1016/j.nima.2018.05.001},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 898,
place = {United States},
year = {Tue May 08 00:00:00 EDT 2018},
month = {Tue May 08 00:00:00 EDT 2018}
}

Journal Article:
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