DNP-NMR用263 GHz回旋振荡管高频系统的研究  

Circuit Design of 263 GHz Gyrotron Oscillator for Dynamic Nuclear Polarization Enhanced Nuclear Magnetic Resonance

作　　者：李志良[1] 冯进军[1] 刘本田[1] 张杨[1] 

机构地区：[1]中国电子科技集团公司第十二研究所微波电真空器件国家级重点实验室,北京100015

出　　处：《真空科学与技术学报》2017年第7期693-698,共6页Chinese Journal of Vacuum Science and Technology

摘　　要：根据动态核极化核磁共振(DNP-NMR)发展需要,对应用于400 MHz DNP-NMR的263 GHz回旋振荡管高频系统进行研究,通过非线性理论计算程序对其进行分析,给出了工作模式为TE03的高频系统的设计参数。并通过粒子模拟(PIC)软件进行注波互作用计算,结果表明,在工作电压10 kV,注电流0.2 A,电子注速度比为2.0时,设计的高频系统输出功率为460.2 W,效率达到23.1%,约1 GHz的调频率范围,可满足263 GHz整管参数设计要求,从而为DNP-NMR用回旋振荡管的研制打下技术基础。Here,we addressed the design of TE03 mode interaction cavity,comprising three-section resonant cavity and used as 263 GHz gyrotron oscillator of 400 MHz dynamic nuclear polarization enhanced nuclear magnetic resonance（ DNP-NMR）. First,the 263 GHz gyrotron oscillator was analyzed by linear/nonlinear theories of gyrotron for design optimization of the interaction structure. Next,the beam-wave interaction in the newly-designed cavity was numerically simulated with particle-in-cell（ PIC） code. The simulated results show that the novel circuit is capable of meeting the requirements of 263 GHz gyrotron. To be specific,operating at 10 kV,0. 2 A and 263. 13 GHz,the electron beam with a velocity ratio of 2. 0 generates a stable output power of 460. 2 W and displays an efficiency of 23. 1%; moreover,the smooth frequency tuning range roughly covers 1 GHz. We suggest that the newly-designed circuit be of some technological interest in gyrotron applications to DNP-NMR.

关 键 词：回旋振荡管 263GHz 注波互作用 动态核极化 核磁共振 

分 类 号：TN129[电子电信—物理电子学] O482.532[理学—固体物理]