Development of a magnetic cusp gun for a 1-THz harmonic gyrotron

Fan-Hong Li; Chao-Hai Du; Zi-Wen Zhang; Si-Qi Li; Zi-Chao Gao; Juan-Feng Zhu; Guo-Wu Ma; Qi-Li Huang; Hong-Ge Ma; Liang Zhang; Adrian W. Cross; Pu-Kun Liu

Development of a magnetic cusp gun for a 1-THz harmonic gyrotron

Fan-Hong Li, Chao-Hai Du, Zi-Wen Zhang, Si-Qi Li, Zi-Chao Gao, Juan-Feng Zhu, Guo-Wu Ma, Qi-Li Huang, Hong-Ge Ma, Liang Zhang, Adrian W. Cross, Pu-Kun Liu

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Abstract

High-quality axis-encircling electron beam is essential to drive a high-harmonic gyrotron. A magnetic cusp gun that can generate a low-spread axis-encircling electron beam at an extremely high magnetic-compression ratio was developed for a 1-THz 4th-harmonic gyrotron toward continuous-wave operation. The optimized gun could generate an axis-encircling electron beam with 80-kV voltage, 1-A current, and a nearly constant pitch factor of about 1.5 in a wide range of magnetic field strength. The transverse velocity spread was less than 2.1% and the guiding center radius was 26.6 µm. The design was verified by using MAGIC, EGUN, and CST simulations and good agreements were achieved.

Original language	English
Pages (from-to)	1-6
Number of pages	6
Journal	IEEE Transactions on Electron Devices
Publication status	Accepted/In press - 7 Oct 2021

Keywords

magnetic cusp gun
axis-encircling beam
THz gyrotron

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Li-etal-IEEE-TED-2021-Development-of-a-magnetic-cusp-gunAccepted author manuscript, 1.31 MB

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title = "Development of a magnetic cusp gun for a 1-THz harmonic gyrotron",

abstract = "High-quality axis-encircling electron beam is essential to drive a high-harmonic gyrotron. A magnetic cusp gun that can generate a low-spread axis-encircling electron beam at an extremely high magnetic-compression ratio was developed for a 1-THz 4th-harmonic gyrotron toward continuous-wave operation. The optimized gun could generate an axis-encircling electron beam with 80-kV voltage, 1-A current, and a nearly constant pitch factor of about 1.5 in a wide range of magnetic field strength. The transverse velocity spread was less than 2.1% and the guiding center radius was 26.6 µm. The design was verified by using MAGIC, EGUN, and CST simulations and good agreements were achieved.",

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journal = "IEEE Transactions on Electron Devices",

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AU - Li, Fan-Hong

AU - Du, Chao-Hai

AU - Zhang, Zi-Wen

AU - Li, Si-Qi

AU - Gao, Zi-Chao

AU - Zhu, Juan-Feng

AU - Ma, Guo-Wu

AU - Huang, Qi-Li

AU - Ma, Hong-Ge

AU - Zhang, Liang

AU - Cross, Adrian W.

AU - Liu, Pu-Kun

N1 - © 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

PY - 2021/10/7

Y1 - 2021/10/7

N2 - High-quality axis-encircling electron beam is essential to drive a high-harmonic gyrotron. A magnetic cusp gun that can generate a low-spread axis-encircling electron beam at an extremely high magnetic-compression ratio was developed for a 1-THz 4th-harmonic gyrotron toward continuous-wave operation. The optimized gun could generate an axis-encircling electron beam with 80-kV voltage, 1-A current, and a nearly constant pitch factor of about 1.5 in a wide range of magnetic field strength. The transverse velocity spread was less than 2.1% and the guiding center radius was 26.6 µm. The design was verified by using MAGIC, EGUN, and CST simulations and good agreements were achieved.

AB - High-quality axis-encircling electron beam is essential to drive a high-harmonic gyrotron. A magnetic cusp gun that can generate a low-spread axis-encircling electron beam at an extremely high magnetic-compression ratio was developed for a 1-THz 4th-harmonic gyrotron toward continuous-wave operation. The optimized gun could generate an axis-encircling electron beam with 80-kV voltage, 1-A current, and a nearly constant pitch factor of about 1.5 in a wide range of magnetic field strength. The transverse velocity spread was less than 2.1% and the guiding center radius was 26.6 µm. The design was verified by using MAGIC, EGUN, and CST simulations and good agreements were achieved.

KW - magnetic cusp gun

KW - axis-encircling beam

KW - THz gyrotron

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SP - 1

EP - 6

JO - IEEE Transactions on Electron Devices

JF - IEEE Transactions on Electron Devices

ER -

Development of a magnetic cusp gun for a 1-THz harmonic gyrotron

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Keywords

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