应用于动态核极化核磁共振谱仪的263 GHz二次谐波回旋管理论设计  

Theory Design of a 263GHz Second Harmonic Gyrotron for Dynamic Nuclear Polarization Nuclear Magnetic Resonance Spectrometers

作　　者：朱承辉 宋韬[1,2] 王维[1,2] 张开春[1,2] 刘頔威[1,2] ZHU Cheng-hui;SONG Tao;WANG Wei;ZHANG Kai-chun;LIU Di-wei(0x09School of electronic science and engineering,University of Electronic Science and Technology of China,Chengdu 611731,China;Key Laboratory of Terahertz Technology,Ministry of Education,Science and Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China)

机构地区：[1]电子科技大学电子科学与工程学院,四川成都611731 [2]电子科技大学太赫兹技术教育部重点实验室,四川成都611731

出　　处：《真空电子技术》2024年第3期28-32,共5页Vacuum Electronics

基　　金：国家自然科学基金项目(62371092,61988102,61921002和62101106);四川省自然科学基金(2024NSFSC0465);中央高校基本科研业务费专项资金资助(ZYGX2020ZB008和ZYGX2021J011);四川省博士后科学专项基金(TB2022039)。

摘　　要：太赫兹回旋管因其输出功率高和有一定频率调谐范围的特性,符合太赫兹波驱动的动态核极化(Dynamic Nuclear Polarization,DNP)核磁共振(Nuclear Magnetic Resonance,NMR)波谱技术对辐射源的要求。常规用于NMR的基波太赫兹回旋管需要相对较强的磁场,而二次谐波工作的回旋管可极大地降低对强磁场的依赖。本文提出了一种应用于动态核极化核磁共振谱仪的263 GHz二次谐波回旋管,并基于自洽非线性理论分析了回旋管的模式选择、模式竞争和注-波互作用,确定工作模式为TE 3,3模。数值仿真结果表明注-波互作用效率为0.2%~28.7%,工作频带在263.71~263.75 GHz,符合增强核磁的太赫兹辐射源的要求。Characterized by high output power and a certain frequency-tuning range,terahertz gyrotron meets the requirements of radiation sources for dynamic nuclear polarization(DNP)nuclear magnetic resonance(NMR)spectroscopy.Conventional fundamental cyclotron harmonic terahertz gyrotrons used in NMR require relatively strong magnetic fields,whereas gyrotrons operating at the second cyclotron harmonic can greatly reduce the strength of the operating magnetic field.A 263 GHz second cyclotron harmonic gyrotron for DNP NMR spectrometers is proposed.The mode selection,mode competition,and beam-wave interaction of the gyrotron are analyzed based on the self-consistent nonlinear theory,and TE 3,3 mode is chosen as the operating mode.Numerical simulation results show that the efficiency of beam-wave interaction ranges from 0.2%to 28.7%,and the frequency-tuning ranges from 263.71 GHz to 263.75 GHz,which can meet the requirements for enhanced NMR terahertz radiation sources.

关 键 词：回旋管 核磁共振 动态核极化 263 GHz 二次谐波 

分 类 号：TN12[电子电信—物理电子学]