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Title Higher Order Mode Coupling Options for the eRHIC Crab Cavity
  • Q. Wu, I. Ben-Zvi, S. Verdú-Andrés, B. P. Xiaopresenter
    BNL, Upton, Long Island, New York, USA
  • I. Ben-Zvi
    Stony Brook University, Stony Brook, USA
Abstract The eRHIC crab cavity adopts the double quarter wave structure developed at Brookhaven National Lab for the LHC Hi-Lumi upgrade crab cavities. The cavity's fundamental mode is at 338 MHz with the first higher order mode more than 180 MHz above that. We looked into the higher order mode distribution up to 2 GHz, and considered various locations and geometries of the coupling scheme. The cylindrical outer shell of the cavity allowed various possibilities for coupler port openings on all the walls, which were difficult for the narrow waist of the LHC double quarter wave crab cavities. Beam pipe absorbers are also options for simpler high frequency modes damping. Some preliminary high pass filter design will also be discussed in this paper.
Funding This work was supported by the US Department of Energy via Brookhaven Science Associates LLC under contract no. DE-SC0012704.
Paper download MOPMF020.PDF [1.001 MB / 4 pages]
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Conference IPAC2018, Vancouver, BC, Canada
Series International Particle Accelerator Conference (9th)
Proceedings Link to full IPAC2018 Proccedings
Session MC1 Poster Session
Date 30-Apr-18   16:00–17:30
Main Classification 01 Circular and Linear Colliders
Sub Classification A19 Electron-Hadron Colliders
Keywords cavity, HOM, damping, coupling, impedance
Publisher JACoW Publishing, Geneva, Switzerland
Editors Shane Koscielniak (TRIUMF, Vancouver, BC, Canada); Todd Satogata (JLab, Newport News, VA, USA); Volker RW Schaa (GSI, Darmstadt, Germany); Jana Thomson (TRIUMF, Vancouver, BC, Canada)
ISBN 978-3-95450-184-7
Published June 2018
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