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https://doi.org/10.18429/JACoW-LINAC2022-THPOJO21
Title Higher Order Modes Investigation in the PERLE Superconducting RF Cavity
Authors
  • C. Barbagallo, P. Duchesne, W. Kaabi, G. Olry, Z.F. Zomer
    Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  • R.A. Rimmer, H. Wang
    JLab, Newport News, Virginia, USA
Abstract The regenerative Beam Break Up (BBU) excited by the dipole Higher Order Modes (HOMs) in superconducting RF (SRF) cavities is a crucial issue for continuous-wave high-current energy recovery linacs. Beam-induced monopole HOMs can increase the cryogenic losses of the linac also. One of the ways to limit these effects is to use HOM couplers on the beam tubes of cavities to absorb and untrap cavity eigenmodes. These couplers feature antennas designed to damp dangerous HOMs and adequately reject the fundamental mode. This study illustrates an investigation of the HOMs of a 5-cell 801.58 MHz elliptical SRF cavity designed for PERLE (Powerful Energy Recovery Linac for Experiments), a multi-turn energy recovery linac (ERL) currently under study and later to be hosted at IJCLab in Orsay. Time-domain wakefield and frequency-domain eigenmode simulations have been used to calculate the cavity broadband HOM impedance spectra and identify the dangerous BBU HOMs. The transmission characteristics of several coaxial HOM couplers have been studied. The efficiencies of several HOM-damping schemes have been compared to propose a HOM endgroup to be fabricated and added to the existing bare SRF cavity.
Paper download THPOJO21.PDF [2.924 MB / 4 pages]
Poster download THPOJO21_POSTER.PDF [2.090 MB]
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Conference LINAC2022
Series International Linear Accelerator Conference (31st)
Location Liverpool, UK
Date 28 August-02 September 2022
Publisher JACoW Publishing, Geneva, Switzerland
Editorial Board Peter McIntosh (STFC DL, Daresbury, UK); Graeme Burt (Lancaster Univ., Lancaster, UK); Robert Apsimon (Lancaster Univ., Lancaster, UK); Volker R.W. Schaa (GSI, Darmstadt, Germany)
Online ISBN 978-3-95450-215-8
Online ISSN 2226-0366
Received 24 August 2022
Revised 27 August 2022
Accepted 01 September 2022
Issue Date 23 September 2022
DOI doi:10.18429/JACoW-LINAC2022-THPOJO21
Pages 731-734
Copyright
Creative Commons CC logoPublished by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.