Generation of High-Power, Reversed-Cherenkov Wakefield Radiation in a Metamaterial Structure

Dataset · Thu Feb 14 04:00:00 EST 2019

DOI:https://doi.org/10.7910/DVN/6PLBO1· OSTI ID:1881277

Lu, Xueying ^[1]; Shapiro, Michael A.; Mastovsky, Ivan; Temkin, Richard J.; Conde, Manoel; Power, John G.; Shao, Jiahang; Wisniewski, Eric E.; Jing, Chunguang

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1. OSTI

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 TM-like 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.

• Research Organization: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• DOE Contract Number: SC0015566
• OSTI ID: 1881277
• Country of Publication: United States
• Language: English

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