CERN Accelerating science

Article
Title	Simulations and First RF Measurements of Coaxial HOM Coupler Prototypes for PERLE SRF Cavities
Author(s)	Barbagallo, Carmelo (IJCLab, Orsay ; U. Paris-Saclay) ; Barriere, Simon (CERN) ; Clement, Sebastien (CERN) ; Duchesne, Patricia (IJCLab, Orsay) ; Gerard, Romain Louis (CERN) ; Gerigk, Frank (CERN) ; Henry, James (Jefferson Lab) ; Kaabi, Walid (IJCLab, Orsay) ; Maurin, Pierre (CERN) ; Olivier, Gilles (IJCLab, Orsay) ; Olry, Guillaume (IJCLab, Orsay) ; Overstreet, Sarah (Jefferson Lab) ; Park, Gunn-Tae (Jefferson Lab) ; Rimmer, Robert (Jefferson Lab) ; Roset, Samuel (IJCLab, Orsay) ; Wang, Haipeng (Jefferson Lab) ; Zomer, Fabian (IJCLab, Orsay ; U. Paris-Saclay)
Publication	2023
Number of pages	4
In:	JACoW SRF 2023 (2023) WEPWB103
In:	21st International Conference on Radio-Frequency Superconductivity (SRF 2023), Grand Rapids, MI, United States, 22 - 30 Jun 2023, pp.WEPWB103
DOI	10.18429/JACoW-SRF2023-WEPWB103
Subject category	Accelerators and Storage Rings
Abstract	Superconducting Radio-Frequency (SRF) linac cryomodules are foreseen for the high-current multi-turn energy recovery linac PERLE (Powerful Energy Recovery Linac for Experiments). Coaxial higher order mode (HOM) couplers are the primary design choice to absorb beam-induced power and avoid beam instabilities. We have used 3D-printed and copper-coated HOM couplers for the prototyping and bench RF measurements on the copper PERLE cavities. We have started a collaboration with JLab and CERN on this effort. This paper presents electromagnetic simulations of the cavity HOM-damping performance on those couplers. Bench RF measurements of the HOMs on an 801.58 MHz 2-cell copper cavity performed at JLab are detailed. The results are compared to eigenmode simulations in CST to confirm the design. RF-thermal simulations are conducted to investigate if the studied HOM couplers undergo quenching.
Copyright/License	© 2024 the author(s) (License: CC-BY-4.0)

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