Conceptual design of a 714-MHz RFQ for compact proton injectors and development of a new tuning algorithm on its aluminium prototype  

作　　者：Yi-Xing Lu Wen-Cheng Fang Yu-Sen Guo Zhen-Tang Zhao 

机构地区：[1]Shanghai Institute of Applied Physics Chinese Academy of Sciences,Shanghai 201800,China [2]University of Chinese Academy of Sciences,Beijing 101408,China [3]Shanghai Advanced Research Institute Chinese Academy of Sciences,Shanghai 201204,China [4]Shanghai Key Laboratory of Cryogenics&Superconducting RF Technology,Shanghai 201800,China [5]ShanghaiTech University,Shanghai 201210,China

出　　处：《Nuclear Science and Techniques》2024年第1期45-58,共14页核技术（英文）

基　　金：This work was supported by National Natural Science Foundation of China(No.12222513).

摘　　要：Radio frequency quadrupoles(RFQs),which are crucial components of proton injectors,significantly affect the performance of proton accelerator facilities.An RFQ with a high frequency of 714 MHz dedicated to compact proton injectors for medi-cal applications is designed in this study.The RFQ is designed to accelerate proton beams from 50 keV to 4 MeV within a short length of 2 m and can be matched closely with the downstream drift tube linac to capture more particles through a preliminary optimization.To develop an advanced RFQ,challenging techniques,including fabrication and tuning method,must be evaluated and verified using a prototype.An aluminium prototype is derived from the conceptual design of the RFQ and then redesigned to confirm the radio frequency performance,fabrication procedure,and feasibility of the tuning algorithm.Eventually,a new tuning algorithm based on the response matrix and least-squares method is developed,which yields favorable results based on the prototype,i.e.,the errors of the dipole and quadrupole components reduced to a low level after several tuning iterations.Benefiting from the conceptual design and techniques obtained from the prototype,the formal mechanical design of the 2-m RFQ is ready for the next manufacturing step.

关 键 词：Compact proton injector RFQ IH-DTL High gradient Tuning 

分 类 号：TL503.3[核科学技术—核技术及应用]