Design of 6 MeV X-band electron linac for dual-head gantry radiotherapy system

• Published in: Journal of the Korean Physical Society Vol. 71; no. 12; pp. 1048 - 1055
• Main Authors: Shin, Seung-wook, Lee, Seung-Hyun, Lee, Jong-Chul, Kim, Huisu, Ha, Donghyup, Ghergherehchi, Mitra, Chai, Jongseo, Lee, Byung-no, Chae, Moonsik
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Physical Society 01.12.2017; Springer Nature B.V; 한국물리학회
• Subjects: Atomic structure; Coupled modes; Genetic algorithms; Mathematical and Computational Physics; Nuclear electric power generation; Nuclear energy; Particle and Nuclear Physics; Physics; Physics and Astronomy; Radiation therapy; Radio frequency; Superhigh frequencies; Theoretical; X ray sources; 물리학; X-band; Electron linac; RF cavity; Genetic algorithm
• ISSN: 0374-4884; 1976-8524
• DOI: 10.3938/jkps.71.1048

A compact 6 MeV electron linac is being developed at Sungkyunkwan University, in collaboration with the Korea atomic energy research institute (KAERI). The linac will be used as an X-ray source for a dual-head gantry radiotherapy system. X-band technology has been employed to satisfy the size requirement of the dual-head gantry radiotherapy machine. Among the several options available, we selected a pi/2-mode, standing-wave, side-coupled cavity. This choice of radiofrequency (RF) cavity design is intended to enhance the shunt impedance of each cavity in the linac. An optimum structure of the RF cavity with a high-performance design was determined by applying a genetic algorithm during the optimization procedure. This paper describes the detailed design process for a single normal RF cavity and the entire structure, including the RF power coupler and coupling cavity, as well as the beam dynamics results.