圆极化TE<sub>11</sub>输出模式旋向可在线切换的相对论磁控管模拟研究

史迪夫; 钱宝良

doi:10.11884/HPLPB202133.210124

圆极化TE₁₁输出模式旋向可在线切换的相对论磁控管模拟研究

doi: 10.11884/HPLPB202133.210124

国防科技大学前沿交叉学科学院，长沙 410073

基金项目: 国家自然科学基金项目（61901484）

详细信息

作者简介:
史迪夫（1987—），男，博士，主要从事高功率微波技术研究

中图分类号: TN128
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- 被引次数: 0
出版历程
- 收稿日期: 2021-03-31
- 修回日期: 2021-06-06
- 网络出版日期: 2021-06-29
- 刊出日期: 2021-07-15

Simulation study on relativistic magnetron with online switchable rotation direction of a circularly polarized TE₁₁output mode

College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China

摘要

摘要: 提出了一种圆极化TE₁₁输出模式旋向可在线切换的相对论磁控管。该器件互作用区结构采用同腔型磁控管结构，输出结构采用全腔提取结构，励磁系统采用Helmholtz线圈磁场系统。本文利用全腔提取结构的模式激励理论对该器件的输出模式成分进行了理论分析，利用粒子模拟软件对该器件的工作性能进行了模拟研究。粒子模拟结果表明：在外加电压770 kV和外加轴向磁场0.2 T（方向与微波轴向输出方向同向）的条件下，该器件的工作模式为5π/6模，工作频率为2.35 GHz，输出功率为3.86 GW，功率效率达到55.5%，输出模式为右旋圆极化TE₁₁模式且模式纯度达到99%以上；当外加轴向磁场与微波轴向输出方向反向时，该器件的输出模式即可在线切换为左旋圆极化TE₁₁模式，而其他输出性能基本保持不变。
- 高功率微波 /
- 相对论磁控管 /
- 全腔提取 /
- 圆极化TE₁₁模式 /
- 输出模式旋向在线切换
Abstract: A relativistic magnetron with online switchable rotation direction of a circularly polarized TE₁₁ output mode is proposed. In the device, the same cavity magnetron is adopted as the beam-wave interaction structure, the all-cavity extraction structure is adopted as the output structure, and the Helmholtz coils system is adopted as the magnetic system. In this paper, the output mode components of the device are theoretically analyzed by the mode excitation theory of all-cavity extraction structure, and the performance of the device is investigated by Particle in Cell simulation. Simulation results show that when the applied voltage is 770 kV and the applied magnetic field that has the same direction with the output microwave is 0.2 T, the device that operates at 5π/6 mode can output a right circularly polarized TE₁₁ mode with the mode purity of more than 99%, the operating frequency of 2.35 GHz and the output power of 3.86 GW, corresponding to the power conversion efficiencyof 55.5%. When the direction of the applied magnetic field is reversed, the rotation direction of the right circularly polarized TE₁₁ mode can be online switched to the left in the condition of keeping other performance of the device.
- high power microwave /
- relativistic magnetron /
- all-cavity extraction /
- circularly polarized TE₁₁ mode /
- online switchable rotation direction of output mode

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图 1 RM纵剖面结构

Figure 1. Schematic diagram of the longitudinal profile of the RM

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图 2 RM横剖面结构

Figure 2. Schematic diagram of the transversal profiles of the RM

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图 3 输入电功率

Figure 3. Input electron beam power versus time

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图 4 输出微波功率

Figure 4. Output microwave power versus time

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图 5 电场积分幅值

Figure 5. Amplitude of electric field integral

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图 6 电场积分频谱

Figure 6. Spectrums of electric integral

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图 7 横截面上电子轮辐

Figure 7. Electron spokes in the R-θ plane of the RM

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图 8 22.390 ns时输出模式

Figure 8. Output mode at 22.390 ns

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图 9 26.744 ns时输出模式

Figure 9. Output mode at 26.744 ns

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图 10 输入电功率

Figure 10. Input electron beam power versus time

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图 11 输出微波功率

Figure 11. Output microwave power versus time

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图 12 电场积分幅值

Figure 12. Amplitude of electric field integral

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图 13 电场积分频谱

Figure 13. Spectrums of electric integral

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图 14 横截面上电子轮辐

Figure 14. Electron spokes in the R-θ plane of the RM

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图 16 26.744 ns时输出模式

Figure 16. Output mode at 26.744 ns

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图 15 22.390 ns时输出模式

Figure 15. Output mode at 22.390 ns

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表 1 电子轮辐逆时针旋转情况下12腔RM的电子轮辐数n₀与输出模式成分的对应关系

Table 1. Output mode components of the 12-cavity RM with the electron spokes rotating counterclockwise

n₀	n_L，1（TE_{n_L，1}）	n_R，1（TE_{n_R，1}）
0	/	/
1	1，1	（5，1）^*
2	2，1	4，1
3	3，1	3，1
4	4，1	2，1
5	（5，1）^*	1，1
6	TEM&（6，1）^*
7	1，1	（5，1）^*
8	2，1	4，1
9	3，1	3，1
10	4，1	2，1
11	（5，1）^*	1，1
12	/	/
^*“（）”表示括号中的模式为衰减的高阶模式。

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表 2 电子轮辐顺时针旋转情况下12腔RM的电子轮辐数n₀与输出模式成分的对应关系

Table 2. Output mode components of the 12-cavity RM with the electron spokes rotating clockwise

n₀	n_L，1（TE_{n_L，1}）	n_R，1（TE_{n_R，1}）
0	/	/
1	（5，1）^*	1，1
2	4，1	2，1
3	3，1	3，1
4	2，1	4，1
5	1，1	（5，1）^*
6	TEM&（6，1）^*
7	（5，1）^*	1，1
8	4，1	2，1
9	3，1	3，1
10	2，1	4，1
11	1，1	（5，1）^*
12	/	/
^*“（）”表示括号中的模式为衰减的高阶模式。

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表 3 输出模式成分数值计算结果

Table 3. Results of numerical calculation of output mode components

mode	percentage/%
TEM	0
TE₁₁	99.97
TE₂₁	0.02
TE₃₁	0.01
TE₄₁	0

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