Uniform permanent magnetic focusing electron optical system for 220 GHz travelling wave tube

Zeng Zaojin; Hu Xinrui; Jiang Yi; Hu Peng; Ma Guowu; Ma Qiaosheng

doi:10.11884/HPLPB202032.200062

Volume 32 Issue 8

Aug. 2020

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Zeng Zaojin, Hu Xinrui, Jiang Yi, et al. Uniform permanent magnetic focusing electron optical system for 220 GHz travelling wave tube[J]. High Power Laser and Particle Beams, 2020, 32: 083002. doi: 10.11884/HPLPB202032.200062

Citation:

Zeng Zaojin, Hu Xinrui, Jiang Yi, et al. Uniform permanent magnetic focusing electron optical system for 220 GHz travelling wave tube[J]. High Power Laser and Particle Beams, 2020, 32: 083002. doi: 10.11884/HPLPB202032.200062

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Uniform permanent magnetic focusing electron optical system for 220 GHz travelling wave tube

doi: 10.11884/HPLPB202032.200062

Institute of Applied Electronics, CAEP, Mianyang 621900, China

Received Date: 2020-03-11
Rev Recd Date: 2020-07-15
Publish Date: 2020-08-13

Abstract

Abstract

Electron optical system is an very important part of folded waveguide traveling wave tube. An electron optical system of a 220 GHz travelling wave tube is designed. The theoretical analysis is based on Pierce electron gun theory and synthesis iteration proposed by Vaughan, and numerical simulation of optical gun is completed by 3D software. The beam is focused by uniform permanent magnetic focusing system, and the uniform permanent magnet design is obtained by theoretical analysis and simulation. Then the uniform permanent magnet is machined and tested. The test result is in agreement with the design result. The electron gun and permanent magnetic focusing system are completely simulated, Which indicates that the beam transmission rate is 100%. The beam tunnel of the device is 0.3 mm in diameter over a length of 31 mm. The electron optical system is machined and tested, and the test result shows the beam transmission rate is 91% at voltage of 20 kV.
- travelling wave tube,
- electron transmission ratio,
- uniform permanent magnetic focusing system,
- electron optical system

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References(14)

References

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