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连续调谐太赫兹回旋管非稳定振荡状态研究

赵其祥 冯进军 吕游 郑树泉 张天钟

赵其祥, 冯进军, 吕游, 等. 连续调谐太赫兹回旋管非稳定振荡状态研究[J]. 强激光与粒子束, 2021, 33: 093007. doi: 10.11884/HPLPB202133.210205
引用本文: 赵其祥, 冯进军, 吕游, 等. 连续调谐太赫兹回旋管非稳定振荡状态研究[J]. 强激光与粒子束, 2021, 33: 093007. doi: 10.11884/HPLPB202133.210205
Zhao Qixiang, Feng Jinjun, Lü You, et al. Study on nonstationary oscillation in continuous frequency tunable terahertz gyrotron[J]. High Power Laser and Particle Beams, 2021, 33: 093007. doi: 10.11884/HPLPB202133.210205
Citation: Zhao Qixiang, Feng Jinjun, Lü You, et al. Study on nonstationary oscillation in continuous frequency tunable terahertz gyrotron[J]. High Power Laser and Particle Beams, 2021, 33: 093007. doi: 10.11884/HPLPB202133.210205

连续调谐太赫兹回旋管非稳定振荡状态研究

doi: 10.11884/HPLPB202133.210205
基金项目: 国家自然科学基金项目(62001131);广西自然科学基金项目(2019GXNSFBA245066);广西科技基地与人才专项(桂科AD19245042);广西无线宽带通信与信号处理重点实验室项目(GXKL06190102)
详细信息
    作者简介:

    赵其祥,zxqi1105@163.com

    通讯作者:

    张天钟,tz.zhang@uestc.edu.cn

  • 中图分类号: TN129

Study on nonstationary oscillation in continuous frequency tunable terahertz gyrotron

  • 摘要: 太赫兹回旋管可实现高功率输出,并具有一定的频率调谐范围,是核磁共振波谱系统理想的高功率太赫兹辐射源。设计了263 GHz,TE5,2基波连续调谐回旋管,通过磁场调节实现频率调谐范围为1.39 GHz,利用时域多模多频自洽非线性理论对设计的连续调谐回旋管非稳定振荡状态进行了研究。结果表明,在低次纵向谐波模式工作磁场范围内,当工作电流大于起振电流时,连续调谐回旋管先进入稳定状态,高次纵向谐波模式被抑制,工作模式TE5,2的输出功率随时间不变;当电流增大,纵向谐波模式间的竞争引起回旋管由稳定状态进入到非稳定振荡状态,工作模式TE5,2的输出功率随时间呈振荡变化且互作用效率大大降低;随着电流的进一步增大,回旋管又回到与低电流不同的稳定状态,互作用效率进一步降低。同时发现非稳定振荡状态的起始电流随着磁场增加而增大。本研究对需工作于稳定状态的面向DNP-NMR应用的连续调谐太赫兹回旋管的研制具有一定指导意义。
  • 图  1  互作用高频结构及归一化纵向谐波模式场幅值分布

    Figure  1.  Interaction circuit and the normalized field profile of high order axial modes

    图  2  不同纵向谐波模式起振电流($ {\rm{\sigma }}=2.9\times {10}^{7} $ S/m,$ {U}_{0}=20 $ kV,$ {R}_{\rm{g}}=1.4 $ mm,$ {\rm{\alpha }}=1.75 $

    Figure  2.  Starting currents of different order axial modes (wall conductivity $ {\rm{\sigma }}=2.9\times {10}^{7} $ S/m, beam voltage $ {U}_{0}=20 $ kV, beam guiding center $ {R}_{\rm{g}}=1.4 $ mm, pitch angle $ {\rm{\alpha }}=1.75 $)

    图  3  稳定工作状态($ {\rm{\sigma }}={\infty } $$ {U}_{0}=20 $ kV,$ {R}_{\rm{g}}=1.4 $ mm,$ {\rm{\alpha }}=1.75 $$ {B}_{0}=9.65 $ T,$ {I}_{0}=25 $ mA)

    Figure  3.  Stationary oscillation when $ {\rm{\sigma }}={\infty } $, $ {U}_{0}=20 $ kV, $ {R}_{\rm{g}}=1.4 $ mm, $ {\rm{\alpha }}=1.75 $, $ {B}_{0}=9.65 $ T, $ {I}_{0}=25 $ mA

    图  4  稳定工作状态($ {\rm{\sigma }}={\infty } $$ {U}_{0}=20 $ kV,$ {R}_{\rm{g}}=1.4 $ mm, $ {\rm{\alpha }}=1.75 $$ {B}_{0}=9.65 $ T,$ {I}_{0}=25 $ mA)

    Figure  4.  Stationary oscillation when $ {\rm{\sigma }}={\infty } $, $ {U}_{0}=20 $ kV, $ {R}_{\rm{g}}=1.4 $ mm, $ {\rm{\alpha }}=1.75 $, $ {B}_{0}=9.65 $ T, $ {I}_{0}=25 $ mA

    图  5  模拟得到的连续调谐回旋管非稳定工作状态,其中${\rm{\sigma }}=2.9\times $$ {10}^{7}$$ {U}_{0}= 20 $ kV,$ {R}_{\rm{g}}=1.4 $ mm,$ {\rm{\alpha }}=1.75 $$ {B}_{0}=9.74 $ T,$ {I}_{0}=25 $ mA

    Figure  5.  Nonstationary oscillation when $ {\rm{\sigma }}=2.9\times {10}^{7} $ S/m, $ {U}_{0}= $$ 20 $ kV, $ {R}_{\rm{g}}=1.4 $ mm, $ {\rm{\alpha }}=1.75 $, $ {B}_{0}=9.74 $ T, $ {I}_{0}=25 $ mA

    图  6  连续调谐回旋管非稳定工作状态($ {\rm{\sigma }}=2.7\times {10}^{7} $$ {U}_{0}=20 $ kV,$ {R}_{\rm{g}}= 1.4 $ mm,$ {\rm{\alpha }}=1.75 $$ {B}_{0}=9.74 $ T,$ {I}_{0}=35 $ mA)

    Figure  6.  Nonstationary oscillation when ${\rm{\sigma }}=2.7\times {10}^{7}$, $ {U}_{0}=20 $ kV, $ {R}_{\rm{g}}= 1.4 $ mm, $ {\rm{\alpha }}=1.75 $, $ {B}_{0}=9.74 $ T, $ {I}_{0}=35 $ mA;

    图  7  连续调谐回旋管稳定工作状态($ {\rm{\sigma }}=2.7\times {10}^{7} $ S/m,$ {U}_{0}=20 $ kV,$ {R}_{\rm{g}}=1.4 $ mm,$ {\rm{\alpha }}=1.75 $$ {B}_{0}=9.74 $ T,$ {I}_{0}=85 $ mA)

    Figure  7.  Stationary oscillation when $ {\rm{\sigma }}=2.7\times {10}^{7} $ S/m, $ {U}_{0}= $$ 20 $ kV, $ {R}_{\rm{g}}=1.4 $ mm, $ {\rm{\alpha }}=1.75 $, $ {B}_{0}=9.74 $ T, $ {I}_{0}=85 $ mA;

    图  8  非稳定振荡状态在磁场和电流平面上的分布(${\rm{\sigma }}=2.7\times $$ {10}^{7}$ S/m,$ {U}_{0}=20 $ kV,$ {R}_{\rm{g}}=1.4 $ mm,$ {\rm{\alpha }}=1.75 $

    Figure  8.  Categorization of non-stationary oscillation on plane of beam current and magnetic field ($ {\rm{\sigma }}=2.7\times {10}^{7} $ S/m, $ {U}_{0}=20 $ kV, $ {R}_{\rm{g}}=1.4 $ mm, $ {\rm{\alpha }}=1.75 $)

    图  9  互作用效率和谐振频率随磁场的变化($ {\rm{\sigma }}=2.7\times $$ {10}^{7} $ S/m,$ {U}_{0}=20 $ kV,$ {R}_{\rm{g}}=1.4 $ mm,$ {I}_{0}=20 $ mA)

    Figure  9.  Beam wave interaction efficiency and oscillation frequency variation with magnetic field when $ {\rm{\sigma }}=2.7\times {10}^{7} $ S/m, $ {U}_{0}=20 $ kV, $ {R}_{\rm{g}}=1.4 $ mm, $ {I}_{0}=20 $ mA

    表  1  263 GHz,$ {\bf{TE}}_{{\bf{5,2}}} $基波连续调谐回旋管工作参数

    Table  1.   Operating parameters for 263 GHz, $ {\bf{TE}}_{\bf{{5,2}}} $ fundamental harmonic frequency continuously tunable gyrotron

    operating
    mode
    beam
    current/mA
    beam
    voltage/kV
    guiding center
    radius/mm
    pitch
    factor
    operating
    frequency/GHz
    wall
    conductivity/(S·m−1)
    frequency tunable
    range/GHz
    power tunable
    range/W
    ${\rm{TE} }_{5,2}$20201.401.75263$ 2.7\times {10}^{7} $1.3980
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-05-29
  • 修回日期:  2021-07-22
  • 网络出版日期:  2021-08-09
  • 刊出日期:  2021-09-15

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