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Title: Effect of crab cavity high order modes on the coupled-bunch stability of High-Luminosity Large Hadron Collider

Abstract

High frequency High Order Modes can significantly affect the coupled-bunch stability in a circular accelerator. With a large enough shunt impedance they may drive a coupled-bunch transverse instability. We have developed an analytical model and implemented it in the NHT Vlasov solver. The results show that the instability is characterized by the excitation of many azimuthal intra-bunch modes, which have similar growth rates, that make the traditional remedies such as a flat resistive feedback and chromaticity inefficient in suppressing it. For the High Luminosity Large Hadron Collider this could result in a significant increase of the stabilizing Landau octupole current, up to $$\sim 100$$ A ($$\sim 20\%$$ of the maximum available current). In order to limit the increase below 10 A ($$\sim 2\%$$), the transverse shunt impedance has to be kept below 1 M$$\Omega$$/m.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [2]
  1. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1523429
Report Number(s):
arXiv:1812.00659; FERMILAB-PUB-18-706-APC
Journal ID: ISSN 2469-9888; PRABCJ; 1706259
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 22; Journal Issue: 5; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Antipov, Sergey A., Biancacci, N., Komppula, J., Métral, E., Salvant, B., and Burov, A. Effect of crab cavity high order modes on the coupled-bunch stability of High-Luminosity Large Hadron Collider. United States: N. p., 2019. Web. doi:10.1103/PhysRevAccelBeams.22.054401.
Antipov, Sergey A., Biancacci, N., Komppula, J., Métral, E., Salvant, B., & Burov, A. Effect of crab cavity high order modes on the coupled-bunch stability of High-Luminosity Large Hadron Collider. United States. doi:10.1103/PhysRevAccelBeams.22.054401.
Antipov, Sergey A., Biancacci, N., Komppula, J., Métral, E., Salvant, B., and Burov, A. Mon . "Effect of crab cavity high order modes on the coupled-bunch stability of High-Luminosity Large Hadron Collider". United States. doi:10.1103/PhysRevAccelBeams.22.054401. https://www.osti.gov/servlets/purl/1523429.
@article{osti_1523429,
title = {Effect of crab cavity high order modes on the coupled-bunch stability of High-Luminosity Large Hadron Collider},
author = {Antipov, Sergey A. and Biancacci, N. and Komppula, J. and Métral, E. and Salvant, B. and Burov, A.},
abstractNote = {High frequency High Order Modes can significantly affect the coupled-bunch stability in a circular accelerator. With a large enough shunt impedance they may drive a coupled-bunch transverse instability. We have developed an analytical model and implemented it in the NHT Vlasov solver. The results show that the instability is characterized by the excitation of many azimuthal intra-bunch modes, which have similar growth rates, that make the traditional remedies such as a flat resistive feedback and chromaticity inefficient in suppressing it. For the High Luminosity Large Hadron Collider this could result in a significant increase of the stabilizing Landau octupole current, up to $\sim 100$ A ($\sim 20\%$ of the maximum available current). In order to limit the increase below 10 A ($\sim 2\%$), the transverse shunt impedance has to be kept below 1 M$\Omega$/m.},
doi = {10.1103/PhysRevAccelBeams.22.054401},
journal = {Physical Review Accelerators and Beams},
number = 5,
volume = 22,
place = {United States},
year = {2019},
month = {5}
}

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