一种准光模式变换器的设计和实验

杨晨; 郭炜; 李文奇; 张志强; 罗积润; 朱敏

doi:10.11999/JEIT210347

一种准光模式变换器的设计和实验

doi: 10.11999/JEIT210347

杨晨^{1, 2, ,},
郭炜¹,
李文奇^{1, 2},
张志强¹,
罗积润^{1, 2},
朱敏¹

1.
中国科学院空天信息创新研究院北京 100094
2.
中国科学院大学北京 100049

基金项目: 国家重点研发计划(2017YFE0300202, 2017YFE0300200)

详细信息

作者简介:
杨晨：女，1992年生，博士生，研究方向为物理电子学、高功率回旋管

郭炜：男，1977年生，高级工程师，主要研究方向为高功率电子器件的设计、实验和测试

李文奇：男，1994年生，硕士，研究方向为高功率回旋管

张志强：男，1975年生，正高级工程师，主要研究方向为高功率微波源、微波毫米波器件

罗积润：男，1957年生，研究员，主要研究方向为大功率速调管、行波管和回旋管放大器的研制、微波毫米波材料的加工和微波能量的应用

朱敏：女，1976年生，研究员，主要研究方向为高功率微波器件

通讯作者:
杨晨　yangchen315@mails.ucas.ac.cn

中图分类号: TN129; TN814
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- 被引次数: 0
出版历程
- 收稿日期: 2021-04-23
- 修回日期: 2021-08-26
- 网络出版日期: 2021-09-15
- 刊出日期: 2022-07-25

Design and Experiment of a Quasi-Optical Mode Converter

YANG Chen^{1, 2
, ,},
GUO Wei¹,
LI Wenqi^{1, 2},
ZHANG Zhiqiang¹,
LUO Jirun^{1, 2},
ZHU Min¹

1.
Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Funds: The National Key R&D Program of China (2017YFE0300202, 2017YFE0300200)

摘要

摘要: 准光模式变换器是实现高功率回旋管高效输出的重要部件。该文针对140 GHz, TE_28,8模回旋振荡管研制，开展以Denisov型辐射器和3个准光镜面构成的准光模式变换器设计与实验研究。利用标量衍射法优化辐射器辐射口径处的场分布，其与理想高斯场之间的矢量相关性为96.2%；基于几何光学和高斯波束匹配方法设计了聚焦镜面与波束整形镜面，采用3维全波分析软件Surf3D获得各个镜面上及输出窗处的场分布，对所设计的镜面系统进行了仿真验证，在输出窗处获得了高斯模式含量为96.67%的输出波束，整个模式变换器的功率转换效率为93.98%。以自行研制的TE_28,8模激励器作为准光模式变换器的输入，通过对模式变换器转换性能仿真结果验证，在严格控制加工精度及装配和实验过程的基础上，完成了准光模式变换器转换性能的冷测实验。实验结果表明，设计和实验具有合理的一致性，可以作为准光模式变换器工程应用设计和验证手段。
- 准光模式变换器 /
- Denisov型辐射器 /
- 高斯模式含量 /
- 冷测
Abstract: Quasi-optical mode converter is an important component to realize the high-efficiency output for a high-power gyrotron oscillator. In this paper, design and experiments of a quasi-optical mode converter, consisting of a Denisov-type launcher and three quasi-optical mirrors, are carried out for the development of 140 GHz/TE_28,8 mode gyrotron oscillator. Based on scalar diffraction method, the field distribution at the radiation aperture of the Denisov-type launcher is optimized to make the vector correlation of the aperture field with the ideal Gaussian field reach 96.2%. Based on the geometric optics method and the Gaussian beam matching method, the focusing mirror and the beam shaping mirrors are designed. A 3D full-wave analysis software Surf3D is used to obtain the field distribution on each mirror surface and the output window, which shows that the output beam with Gaussian mode content of 96.67% is obtained at the output window. The total power conversion efficiency of the quasi-optical mode converter is 93.98%. The design and experiments of the quasi-optical mode converter are performed to use the output signal of the self-developed TE_28,8 mode generator as its input one under the conditions of the simulated demonstration for its conversion characteristics and the strict control for machining precision as well as the process of the converter assemble and testing. The tested results indicate that the design is in good agreement with the experiment, which is helpful for engineering design and experimental demonstration of the quasi-optical mode converter development.
- Quasi-optical mode converter /
- Denisov-type launcher /
- Gaussian mode content /
- Cold experiment

HTML全文

图 1 辐射器内壁上扰动的幅度和长度

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图 2 Denisov辐射器内壁面扰动分布

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图 3 辐射器壁面场归一化幅度分布

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图 4 辐射器口径场分布

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图 5 Denisov辐射器辐射场分布(幅度以dB表示)

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图 6 波束整形镜面的设计过程示意图

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图 7 镜面系统中各个镜面的大小和轮廓

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图 8 准光模式变换器系统图

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图 9 镜面系统中各个镜面与输出窗上的场分布在Y-Z方向的投影(幅度范围为–30～0 dB)

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图 10 波束在准光模式变换器中的传播路径

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图 11 以激励器输出作为输入时，准光模式变换器的仿真结果(幅度范围为–30～0 dB)

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图 12 完成装配的准光模式变换器

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图 13 准光模式变换器测试系统框图

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图 14 准光模式变换器测试现场

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图 15 沿波束传播路径不同横截面处的场幅度及相位分布的测量结果

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图 16 理想高阶模式与激励场输入下，输出窗处(离轴160 mm)的场分布仿真结果

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表 1 镜面与输出窗在系统坐标系中的位置

镜面中心位置(mm) 与z轴夹角(°)

镜面1 (59.5,0,212.7) 0
镜面2 (–60,0,268.6) 11.1
镜面3 (100,0,442.3) 23.7
输出窗 (–160,0,442.3) 0

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参考文献(30)

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