• Open Access

Transverse beam instabilities in the presence of linear coupling in the Large Hadron Collider

L. R. Carver, X. Buffat, K. Li, E. Métral, and M. Schenk
Phys. Rev. Accel. Beams 21, 044401 – Published 30 April 2018
An article within the collection: IPAC 2017 Conference Edition

Abstract

In the past, transverse coherent instabilities have been observed at the Hadron-Electron Ring Accelerator (HERA) proton ring that were instigated by the presence of linear coupling. Linear coupling can also potentially explain some transverse instabilities that were observed in the Large Hadron Collider (LHC) in both run I and run II, however a detailed description of the destabilizing mechanism of linear coupling was not known at the time. A study into the effect of linear coupling on transverse beam stability was carried out, and a new mechanism that could incite transverse instabilities by causing a loss of Landau damping has been found. The study includes time domain simulations with PyHEADTAIL and frequency domain computations based on analytical approaches, and was then verified by measurements with a single proton bunch in the LHC.

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  • Received 23 October 2017

DOI:https://doi.org/10.1103/PhysRevAccelBeams.21.044401

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Accelerators & Beams

Collections

This article appears in the following collection:

IPAC 2017 Conference Edition

A collection of articles that expand upon original research presented at the 2017 International Particle Accelerator Conference (14-19 May 2017, Copenhagen, Denmark).

Authors & Affiliations

L. R. Carver*, X. Buffat, K. Li, E. Métral, and M. Schenk

  • CERN, CH-1211 Geneva, Switzerland
  • EPFL, CH-1015 Lausanne, Switzerland

  • *Lee.Robert.Carver@cern.ch

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Issue

Vol. 21, Iss. 4 — April 2018

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