Year: 2023
Type: article
Abstract: Short-pulse two-beam acceleration (TBA) is a promising advanced accelerator concept that may meet the luminosity and cost requirements of future large-scale linear colliders. Accelerating structures with high group velocity (on the order of 0.1c) are required in this scheme to reduce the filling time so as to efficiently accelerate the main beam with multiple bunches. In conventional accelerating structures such as metallic disk-loaded and dielectric-loaded, high group velocity usually implies low shunt impedance, which limits the rf-to-main-beam efficiency and causes a bottleneck in the overall wall-plug-to-main-beam efficiency. A dielectric disk accelerator (DDA) is a hybrid structure, which has geometry similar to metallic disk-loaded accelerators, but replaces the metal disks with dielectric disks to form the cells. Such a configuration could achieve simultaneous high group velocity and high shunt impedance, making a DDA a very attractive candidate for the short-pulse TBA approach by significantly improving power efficiency. In this manuscript, we present the start-to-end development of two $X$-band single-cell DDA prototypes, including the rf and mechanical design, fabrication, cold test, high power beam test, and post-test inspection. Of the two, a clamped structure performed better, achieving $102\text{ }\text{ }\mathrm{MV}/\mathrm{m}$ accelerating gradient from 320-MW input power.
Authors: B. Freemire, J. Shao, S. Weatherly, M. Peng, E. Wisniewski, S. Doran, W. Liu, C. Whiteford, X. Lu, S. Poddar, E. Gomez, J. Power, C. Jing
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Awards: G102163711, G1286251239, G1505794299, G2101401529, G2287611682, G262962599, G3445879829, G426311843, G498139845, G5106849484, G5387317844, DEVELOPMENT OF DIELECTRIC DISK ACCELERATORS FOR ARGONNE 500MEV SHORT PULSE TWO BEAM WAKEFIELD ACCELERATOR DEMONSTRATOR, G5910536577, G6848031779, G6918803902, G7368700025, G7583137537, G951383023, G969889393, G993149817
OpenAlex ID: W4383371773