RF design and study of a 325 MHz 7 Me V APF IH-DTL for an injector of a proton medical accelerator  

作　　者：Xuan Li Yue-Hu Pu Fan Yang Xiu-Cui Xie Qiang Gu Jian Qiao Ming-Hua Zhao 

机构地区：[1]Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China [2]Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China [3]University of Chinese Academy of Sciences, Beijing 100049, China [4]Shanghai APACTRON Particle Equipment Co., Ltd, Shanghai 201800, China

出　　处：《Nuclear Science and Techniques》2019年第9期34-46,共13页核技术（英文）

基　　金：supported by the National Key Research and Development Program of China(No.2016YFC0105408)

摘　　要：A compact interdigital H-mode drift-tube linac (IH-DTL) with the alternating-phase-focusing (APF) method, working at 325 MHz was designed for an injector of a proton medical accelerator. When fed in with a proper RF (radio frequency) power, the DTL cavity could establish the corresponding electromagnetic field to accelerate the ‘‘proton bunches’’ from an input energy of 3 MeV to an output energy of 7 MeV successfully, without any additional radial focusing elements. The gap-voltage distribution which was obtained from the CST■ Microwave Studio software simulations of the axial electric field was compared with that from the beam dynamics, and the errors met the requirements within ± 5%. In this paper, the RF design procedure and key results of the APF IH-DTL, which include the main RF characteristics of the cavity, frequency sensitivities of the tuners, and coupling factor of the RF power input coupler are presented.A compact interdigital H-mode drift-tube linac(IH-DTL) with the alternating-phase-focusing(APF)method, working at 325 MHz was designed for an injector of a proton medical accelerator. When fed in with a proper RF(radio frequency) power, the DTL cavity could establish the corresponding electromagnetic field to accelerate the ‘‘proton bunches’ ’ from an input energy of 3 Me V to an output energy of 7 Me V successfully, without any additional radial focusing elements. The gap-voltage distribution which was obtained from the CSTòMicrowave Studio software simulations of the axial electric field was compared with that from the beam dynamics, and the errors met the requirements within ± 5%. In this paper, the RF design procedure and key results of the APF IH-DTL, which include the main RF characteristics of the cavity, frequency sensitivities of the tuners, and coupling factor of the RF power input coupler are presented.

关 键 词：PROTON therapy PROTON medical accelerator INJECTOR Drift-tube LINAC (DTL) Interdigital H-MODE (IH) Alternating-phase-focusing (APF) 

分 类 号：TL[核科学技术]