Publication Date


Document Type


First Advisor

Lu, Xueyin

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Physics


Structure-based wakefield acceleration (SWFA) is an advanced accelerator concept that can achieve higher accelerating gradients than conventional accelerators. Advanced structures are required for SWFA, with metamaterial (MTM) structures as a promising candidate. MTMs are periodic sub-wavelength structures engineered to exhibit exotic electromagnetic properties, such as simultaneously negative permittivity and permeability. Because of their unique electromagnetic properties, MTMs are particularly interesting to SWFA. Previous studies at the Argonne Wakefield Accelerator have demonstrated efficient wakefield power extraction using MTM structures. This thesis presents the design, fabrication, and cold test of an X-band MTM accelerating structure for two-beam acceleration. An MTM structure was designed and optimized for operation at high gradients when it is excited by a short RF pulse with a pulse length of 6~ns. Cold test of the fabricated MTM structure shows good agreement with simulation results. A beam test was designed and carried out at the Argonne Wakefield Accelerator to study phenomena associated with short-pulse RF breakdown physics, where short-pulse acceleration has been proven beneficial for gradient improvement.


80 pages




Northern Illinois University

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