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Title: Complementary split-ring resonator-coupled traveling wave accelerating structure
Authors: McGregor, I
Hock, K.M 
Issue Date: 2013
Citation: McGregor, I, Hock, K.M (2013). Complementary split-ring resonator-coupled traveling wave accelerating structure. Physical Review Special Topics - Accelerators and Beams 16 (8) : 80102. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: In this paper, we present theoretical and simulation-based analyses of a novel, normal-conducting, multiple-cell, traveling wave accelerating structure. Instead of the conventional circular apertures, we utilize asymmetric complementary split-ring resonators to couple pillbox cavities and bring the phase velocity below that of the speed of light in vacuo. We show that this architecture exhibits a low, negative, group velocity and that the 0 through ? modes decrease in order of frequency - in contrast to conventional electrically coupled structures in which the 0 mode has the lowest frequency and the ? mode the highest. We illustrate the efficacy of the proposed design via electromagnetic and particle simulation results for a four-cell structure operating around 1.9 GHz. Results are given for operation in the ?, 2?/3, and ?/3 modes. Our design achieves accelerating gradients of around 3.3 MV/m and a cavity voltage of 0.594 MV for an applied rf power of 82 kW (? mode). The accelerating gradients achieved are up to 3.3 times that of a conventional circular aperture-coupled design with the same phase velocity, rf excitation power, operating frequency, mode type, and number of cells.
Source Title: Physical Review Special Topics - Accelerators and Beams
ISSN: 1098-4402
DOI: 10.1103/PhysRevSTAB.16.080102
Rights: Attribution 4.0 International
Appears in Collections:Staff Publications

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