Simulation analysis and test of periodic focusing system with opening magnetic ring
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摘要: 当前行波管周期永磁聚焦系统的波端口位置处的磁环通常采用单向开口磁环。在波端口位置引入波导阻抗调谐支节的基础上，提出了两种不同的双向开口磁环结构。利用三维电磁仿真软件Opera-3D，分析了双开口磁环的中心轴线附近的磁场，并据此进一步介绍了带双开口磁环周期永磁聚焦系统的设计方法。为了验证带双开口磁环的周期永磁聚焦系统应用的可行性，设计和测试了一套E波段折叠波导行波管电子光学系统。在行波管试验中，电子枪发射电流83 mA，带双开口磁环的周期永磁聚焦系统聚焦的电子束流通率达到99%。
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关键词:
- 双开口磁环 /
- 周期永磁聚焦（PPM）系统 /
- 电子光学系统 /
- 行波管 /
- Opera-3D
Abstract: The magnetic ring at the wave port position of the TWT periodic permanent magnet focusing system usually adopts single open magnetic ring. Two different double-open magnetic rings were proposed because of adding waveguide impedance tuning branch at the wave port position. The magnetic field near the central axis of the double-open magnetic ring was analyzed by using the 3D electromagnetic simulation software Opera-3D, and the design method of the periodic magnetic focusing system of double-open magnetic ring was put forward. In order to verify the feasibility of periodic permanent magnet focusing system with double-open magnetic rings, an electronic optical system of E-band folded waveguide TWT was designed and tested. In the traveling wave tube test, the emission current of the electron gun was 83 mA, and the electron beam flow rate of the periodic magnetic focusing system with double-open magnetic rings was 99%. -
表 1 带极靴的单个磁环实验结果
Table 1. Experimental results of single magnetic ring with pole shoes
single magnetic No.1 No.2 No.3 No.4 (double-open magnetic ring-1) No.5 No.6 No.7 axial magnetic field, input end/T 0.377 6 0.243 6 0.398 5 0.267 5 0.382 7 0.306 5 0.370 5 axial magnetic field, output end/T 0.361 3 0.341 2 0.406 1 0.296 7 0.402 0 0.288 0 0.398 7 Note: No. 1～3 and 5～7 are normal magnetic rings. 
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表 2 带极靴的单个磁环实验结果
Table 2. Experimental results of single magnetic ring with pole shoes
magnetic ring No.1 No.2 No.3 No.4 (double-open magnetic ring-2) No.5 No.6 No.7 axial magnetic field, input end/T 0.377 6 0.243 6 0.398 5 0.281 4 0.382 7 0.306 5 0.370 5 axial magnetic field, output end/T 0.361 3 0.341 2 0.406 1 0.312 8 0.402 0 0.288 0 0.398 7 Note: No. 1～3 and 5～7 are normal magnetic rings.
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表 3 磁系统轴向磁场实验结果
Table 3. Experimental results of axial magnetic field in magnetic system
magnetic ring No.1 No.2 No.3 No.4 (double-open magnetic ring-1) No.5 No.6 No.7 axial magnetic field, input end/T 0.350 0 0.380 0 0.358 0 0.384 6 0.373 4 0.396 4 0.412 4 axial magnetic field, output end/T 0.4092 0.4255 0.3812 0.3991 0.3564 0.4212 0.3577 Note: No. 1～3 and 5～7 are normal magnetic rings.
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表 4 磁系统轴向磁场实验结果
Table 4. Experimental results of axial magnetic field in magnetic system
magnetic ring No.1 No.2 No.3 No.4 (double-open magnetic ring-2) No.5 No.6 No.7 axial magnetic field, input end/T 0.351 6 0.382 8 0.362 3 0.391 3 0.379 4 0.399 1 0.413 8 axial magnetic field, output end/T 0.410 1 0.428 1 0.389 8 0.407 7 0.371 2 0.428 5 0.358 0 Note: No. 1～3 and 5～7 are normal magnetic rings.
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