Presents a novel bi-periodic structure that enhances accelerating voltage in SPARC, suggesting improved performance over standard designs.
The paper presents the design of a compact bi-periodic accelerating section, operating at the frequency of 11.424 GHz, for linearizing the longitudinal phase space in the Frascati Linac Coherent Light Source (SPARC). The structure operates on the p/2 standing wave mode with axial coupled cavities, and it is designed to obtain a 5 MV accelerating voltage. The proposed accelerating section represents an alternative design to the standard p-mode cavity, having some advantages as discussed in the paper. Numerical simulations have been carried out with SUPERFISH, OSCARD2D and ABCI codes, in frequency and in time domain. The study includes: field profile optimization, quality factor and shunt impedance calculation, analysis of the generator-cavity coupling and thermal analysis.
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