CERN Accelerating science

Article
Report number	arXiv:2110.12147
Title	Design, fabrication, and low-power rf measurement of an X-band dielectric-loaded accelerating structure
Author(s)	Wei, Yelong (CERN ; Cockcroft Inst. Accel. Sci. Tech. ; Liverpool U.) ; Bursali, Hikmet (CERN ; Rome U.) ; Grudiev, Alexej (CERN) ; Freemire, Ben (Euclid TechLabs, Rockville) ; Jing, Chunguang (Euclid TechLabs, Rockville ; Argonne) ; Bedolla, Joel Sauza (Lancaster U.) ; Wegner, Rolf (CERN) ; Welsch, Carsten (Cockcroft Inst. Accel. Sci. Tech. ; Liverpool U.)
Publication	2022-04-01
Imprint	2021-10-23
Number of pages	16
In:	Phys. Rev. Accel. Beams 25 (2022) 041301
DOI	10.1103/PhysRevAccelBeams.25.041301 (publication)
Subject category	physics.acc-ph ; Accelerators and Storage Rings
Abstract	Dielectric-loaded accelerating (DLA) structures are being studied as an alternative to conventional disk-loaded copper structures to produce the high accelerating gradient. This paper presents the design, fabrication and low-power RF measurement of an externally-powered X-band DLA structure with a dielectric constant $\varepsilon$$_{r}$ = 16.66 and a loss tangent tan$_{\delta}$ = 3.43 x 10$^{-5}$. A dielectric matching section for coupling the RF power from a circular waveguide to an X-band DLA structure consists of a very compact dielectric disk with a width of 2.035 mm and a tilt angle of 60 degree, resulting in a broadband coupling at a low RF field which has the potential to survive in the high-power environment. Based on simulation studies, a prototype of the DLA structure was fabricated. Results from bench measurements and their comparison with design values are presented. The detailed analysis on the fabrication error which may cause the discrepancy between the RF measurements and simulations is also discussed.
Copyright/License	publication: © 2022-2025 authors (License: CC BY 4.0) preprint: (License: arXiv nonexclusive-distrib 1.0)

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