CERN Accelerating science

Article
Report number	arXiv:2301.02340
Title	Wakefield damping in a distributed coupling linear accelerator
Related title	Wakefield damping in a distributed coupling LINAC
Author(s)	Ericson, Evan (CERN ; Saskatchewan U.) ; Grudiev, Alexej (CERN) ; Bertwistle, Drew (Saskatchewan U. ; Saskatchewan U., CLS) ; Boland, Mark J. (Saskatchewan U. ; Saskatchewan U., CLS)
Publication	2023-10-11
Imprint	2023-01-05
Number of pages	7
In:	Nucl. Instrum. Methods Phys. Res., A 1057 (2023) 168770
DOI	10.1016/j.nima.2023.168770 (publication)
Subject category	physics.acc-ph ; Accelerators and Storage Rings
Abstract	The number of cells in a $\pi$-mode standing wave (SW) accelerating structure for the Compact linear Collider (CLIC) project is limited by mode overlap with nearby modes. The distributed coupling scheme avoids mode overlap by treating each cell as independent. Designs of cells suitable for distributed coupling with strong wakefield damping have not previously been studied. In this paper we develop a SW cell to be used in a distributed coupling structure that can satisfy the CLIC transverse wakepotential limit. From the middle cell of the CLIC-G* travelling wave (TW) structure, a SW cell is designed. The cell is adapted to be suitable for distributed coupling. Its wakepotentials in an ideal case of open boundaries are reduced to satisfy the wakepotential threshold. An electric boundary is added to the model to simulate total reflection at the distribution network. A horizontal coupler cell that connects to the distribution network such that the reflected wakefields remain similar to the open boundary case is simulated. A triplet module which takes advantage of cell-to-cell coupling to reduce reflected wakepotential is presented.
Copyright/License	publication: © 2023-2024 The Author(s) (License: CC-BY-4.0) preprint: (License: CC BY-SA 4.0)

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