Multi-Mode Cavity Accelerator Structure [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 621.38 Electronics, communications engineering
• Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of High Energy Physics ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2016
• Mô tả vật lý: Size: 19 p. : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 268091
• Chủ đề: 1. 43 particle accelerators; 2. Accelerators; 3. Cavity resonators; 4. Coupling; 5. Surfaces

Tóm tắt

 This project aimed to develop a prototype for a novel accelerator structure comprising coupled cavities that are tuned to support modes with harmonically-related eigenfrequencies, with the goal of reaching an acceleration gradient >
 200 MeV/m and a breakdown rate <
 10<
 sup>
 -7<
 /sup>
 /pulse/meter. Phase I involved computations, design, and preliminary engineering of a prototype multi-harmonic cavity accelerator structure
  plus tests of a bimodal cavity. A computational procedure was used to design an optimized profile for a bimodal cavity with high shunt impedance and low surface fields to maximize the reduction in temperature rise ?T. This cavity supports the TM010 mode and its 2nd harmonic TM011 mode. Its fundamental frequency is at 12 GHz, to benchmark against the empirical criteria proposed within the worldwide High Gradient collaboration for X-band copper structures
  namely, a surface electric field E<
 sub>
 sur<
 /sub>
 <
 sup>
 max<
 /sup>
 <
  260 MV/m and pulsed surface heating ?T<
 sup>
 max<
 /sup>
 <
  56 �K. With optimized geometry, amplitude and relative phase of the two modes, reductions are found in surface pulsed heating, modified Poynting vector, and total RF power?as compared with operation at the same acceleration gradient using only the fundamental mode.