BNCT RFQ高功率耦合器的设计  

Design of High Power Coupler for BNCT RFQ

作　　者：肖永川[1] 欧阳华甫 荣林艳[1] 薛康佳[1] 刘盛进[1] 曹秀霞[1] 吕永佳[1] 陈卫东 XIAO Yongchuan;OUYANG Huafu;RONG Linyan;XUE Kangjia;LIU Shengjin;CAO Xiuxia;LYU Yongjia;CHEN Weidong(China Spallation Neutron Source,Institute of High Energy Physics,Chinese Academy of Sciences,Dongguan 523803,China;Dongguan Institute of Neutron Science,Dongguan523808,China)

机构地区：[1]中国科学院高能物理研究所东莞研究部,广东东莞523803 [2]散裂中子源科学中心,广东东莞523808

出　　处：《原子能科学技术》2021年第10期1879-1884,共6页Atomic Energy Science and Technology

基　　金：STS双创引导项目(KFJ-STS-SCYD-323)。

摘　　要：为满足硼中子俘获治疗试验装置(BNCT_A)RFQ加速器腔耗420 kW、占空比50%的需求。为BNCT_A RFQ加速器设计了一款高功率耦合器。该功率耦合器包含WR2300矩型波导转3-1/8英寸同轴门钮结构、波导窗、功率耦合装置3个部件。波导窗采用同轴扼流结构型式,功率耦合装置采用磁耦合环结构。整个功率耦合器采用分段设计的原则。矩型波导转同轴结构和陶瓷窗分别通过Microwave Studio(MWS)优化仿真,得到陶瓷窗的驻波比(SWR)达到1.0009@352.2 MHz,带宽大于±58 MHz@SWR≤1.1 MHz。用多端口换算理论确定了耦合环耦合度,并用能量衰减法确定耦合环的尺寸。从热学和结构力学方面校核了该功率耦合器的功率容量,在50%占空比下,单个功率耦合器最高峰值功率可达260 kW,4路功率耦合器最高峰值功率可达1 MW。经过实际高功率测试,目前入腔功率484 kW,占空比达到10%,并具提升峰值功率及占空比的能力。The input power and duty factor of boron neutron capture therapy test equipment_A(BNCT_A)RFQ are respectively 420 kW and 50%.In order to meet the power requirements of the RFQ cavity,a high power RF coupler was designed.This coupler includes WR2300 waveguide-coaxial transformer,ceramic window,and power coupling equipment.The ceramic window employs Choking structure type and power coupling equipment is a magnetic loop.The segmented design method was used in the design of the power coupler.The waveguide-coaxial transformer and ceramic window were respectively optimized by using Microwave Studio(MWS).The standing wave ratio(SWR)of the ceramic window is 1.0009@352.2 MHz,and the bandwidth is more than±58 MHz@SWR≤1.1 MHz.The coupling factor of magnetic loop was obtained by multi-port transform theory and by using the energy attenuation method,and the size of the magnetic loop was determined.The thermal and structure analysis result shows that the peak in-put power can achieve 260 kW,with 50%duty factor for a single coupler,and 1 MW power can be achieved under four-channel coupler.After RF power test and conditioning,the RF power feeding to the cavity is reached to 484 kW,with 10%duty factor at present,and the power and duty cycle can be improved in future.

关 键 词：RFQ加速器 功率耦合器 高功率 硼中子俘获治疗试验装置 

分 类 号：TL53[核科学技术—核技术及应用]