Generation of High-Power, Reversed-Cherenkov Wakefield Radiation in a Metamaterial Structure
Name
PhysRevLett.122.014801.pdf
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1015.62 KB
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Author(s)
Conde, Manoel
Power, John G.
Shao, Jiahang
Wisniewski, Eric E.
Jing, Chunguang
Lu, Xueying
Shapiro, Michael
Mastovsky, Ivan
Temkin, Richard J
Date Issued
January 2019
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Lu, Xueying et al. "Generation of High-Power, Reversed-Cherenkov Wakefield Radiation in a Metamaterial Structure." Physical Review Letters 122, 1 (January 2019): 014801 © 2019 American Physical Society
Version
Final published version
Abstract
We present the first demonstration of high-power, reversed-Cherenkov wakefield radiation by electron bunches passing through a metamaterial structure. The structure supports a fundamental transverse magnetic mode with a negative group velocity leading to reversed-Cherenkov radiation, which was clearly verified in the experiments. Single 45 nC electron bunches of 65 MeV traversing the structure generated up to 25 MW in 2 ns pulses at 11.4 GHz, in excellent agreement with theory. Two bunches of 85 nC with appropriate temporal spacing generated up to 80 MW by coherent wakefield superposition, the highest rf power that metamaterial structures ever experienced without damage. These results demonstrate the unique features of metamaterial structures that are very attractive for future high-gradient wakefield accelerators, including two-beam and collinear accelerators. Advantages include the high shunt impedance for high-power generation and high-gradient acceleration, the simple and rugged structure, and a large parameter space for optimization.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.122.014801
