真空电子技术Issue(3)：28-32,5.DOI:10.16540/j.cnki.cn11-2485/tn.2024.03.06
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
摘要
Abstract
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 reso-nance(NMR)spectroscopy.Conventional fundamental cyclotron harmonic terahertz gyrotrons used in NMR require relatively strong magnetic fields,whereas gyrotrons operating at the second cyclotron har-monic can greatly reduce the strength of the operating magnetic field.A 263 GHz second cyclotron har-monic 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 TE3,3 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Key words
Gyrotron/Nuclear magnetic resonance/Dynamic nuclear polarization/263GHz/Second harmonic分类
电子信息工程引用本文复制引用
朱承辉,宋韬,王维,张开春,刘頔威..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[J].真空电子技术,2024,(3):28-32,5.基金项目
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) （62371092,61988102,61921002和62101106）
