Development of a 1-THz 4th-harmonic gyrotron

Fan-Hong Li; Chao-Hai Du; Zi-Chao Gao; Shi Pan; Juan-Feng Zhu; Zi-Wen Zhang; Si-Qi Li; Liang Zhang; Adrian W. Cross

doi:10.1109/UCMMT49983.2020.9296084

Development of a 1-THz 4th-harmonic gyrotron

Fan-Hong Li, Chao-Hai Du, Zi-Chao Gao, Shi Pan, Juan-Feng Zhu, Zi-Wen Zhang, Si-Qi Li, Liang Zhang, Adrian W. Cross

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution book

1 Citation (Scopus)

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Abstract

A design of a 1-THz 4th Harmonic Gyrotron is proposed in this paper. Fourth harmonic interaction is adopted to lower the strength of the external magnet. The magnet can be as low as 10T. Such a low-intensity magnetic field can be easily proposed by a superconduct magnet, which make the generation of continuous waves at 1 THz possible. Seeing that the mode competition is extremely fierce, a large orbit gun is employed as the driven source. An 80-kV, 0.7-A electron beam is injected into the interaction circuit to excite the fourth-harmonic electromagnetic waves. According to the cold dispersive diagram, the TE4, 8 mode of the cylindrical waveguide is selected as the operating mode to further suppress the mode competition induced by the fundamental modes, the 2nd harmonic modes and the 3rd harmonic modes. It could be inferred based on the multi-mode time-domain theory that an output power of 1.15 kW can be achieved. The scheme diagram for the hot test is proposed. The LOG is chosen as the electron gun. Particular structure is employed for improving the output efficiency in the interaction circuit.

Original language	English
Title of host publication	2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies, UCMMT 2020
Place of Publication	New York
Number of pages	2
ISBN (Electronic)	9781728190648
DOIs	https://doi.org/10.1109/UCMMT49983.2020.9296084
Publication status	Published - 30 Dec 2020
Event	13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies, UCMMT 2020 - Virtual, Tianjin, China Duration: 29 Aug 2020 → 1 Sept 2020

Publication series

Name	2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies, UCMMT 2020
Publisher	IEEE
ISSN (Print)	2639-4545
ISSN (Electronic)	2639-4537

Conference

Conference	13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies, UCMMT 2020
Country/Territory	China
City	Virtual, Tianjin
Period	29/08/20 → 1/09/20

Funding

Professor Chao-Hai Du would like to thank the Royal Society of London, UK, Newton Advanced Fellowships (NAF\R1\180121) for supporting this work. This work was also in part supported by the National Science Foundation of China under Contract 61861130367, Contract NSAF U1830201, and Contract 61531002.

Keywords

gyrotrons
anodes
magnetic fields
superconducting magnets
harmonic analysis
probes
magnetic domains

Access to Document

10.1109/UCMMT49983.2020.9296084

Li-etal-UCMMT-2020-Development-of-a-1-THz-4th-harmonic-gyrotronAccepted author manuscript, 168 KB

Cite this

Li, F.-H., Du, C.-H., Gao, Z.-C., Pan, S., Zhu, J.-F., Zhang, Z.-W., Li, S.-Q., Zhang, L., & Cross, A. W. (2020). Development of a 1-THz 4th-harmonic gyrotron. In 2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies, UCMMT 2020 Article 9296084 (2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies, UCMMT 2020).. https://doi.org/10.1109/UCMMT49983.2020.9296084

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abstract = "A design of a 1-THz 4th Harmonic Gyrotron is proposed in this paper. Fourth harmonic interaction is adopted to lower the strength of the external magnet. The magnet can be as low as 10T. Such a low-intensity magnetic field can be easily proposed by a superconduct magnet, which make the generation of continuous waves at 1 THz possible. Seeing that the mode competition is extremely fierce, a large orbit gun is employed as the driven source. An 80-kV, 0.7-A electron beam is injected into the interaction circuit to excite the fourth-harmonic electromagnetic waves. According to the cold dispersive diagram, the TE4, 8 mode of the cylindrical waveguide is selected as the operating mode to further suppress the mode competition induced by the fundamental modes, the 2nd harmonic modes and the 3rd harmonic modes. It could be inferred based on the multi-mode time-domain theory that an output power of 1.15 kW can be achieved. The scheme diagram for the hot test is proposed. The LOG is chosen as the electron gun. Particular structure is employed for improving the output efficiency in the interaction circuit.",

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Li, F-H, Du, C-H, Gao, Z-C, Pan, S, Zhu, J-F, Zhang, Z-W, Li, S-Q, Zhang, L & Cross, AW 2020, Development of a 1-THz 4th-harmonic gyrotron. in 2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies, UCMMT 2020., 9296084, 2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies, UCMMT 2020, New York, 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies, UCMMT 2020, Virtual, Tianjin, China, 29/08/20. https://doi.org/10.1109/UCMMT49983.2020.9296084

Development of a 1-THz 4th-harmonic gyrotron. / Li, Fan-Hong; Du, Chao-Hai; Gao, Zi-Chao et al.
2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies, UCMMT 2020. New York, 2020. 9296084 (2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies, UCMMT 2020).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution book

TY - GEN

T1 - Development of a 1-THz 4th-harmonic gyrotron

AU - Li, Fan-Hong

AU - Du, Chao-Hai

AU - Gao, Zi-Chao

AU - Pan, Shi

AU - Zhu, Juan-Feng

AU - Zhang, Zi-Wen

AU - Li, Si-Qi

AU - Zhang, Liang

AU - Cross, Adrian W.

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 - 2020/12/30

Y1 - 2020/12/30

N2 - A design of a 1-THz 4th Harmonic Gyrotron is proposed in this paper. Fourth harmonic interaction is adopted to lower the strength of the external magnet. The magnet can be as low as 10T. Such a low-intensity magnetic field can be easily proposed by a superconduct magnet, which make the generation of continuous waves at 1 THz possible. Seeing that the mode competition is extremely fierce, a large orbit gun is employed as the driven source. An 80-kV, 0.7-A electron beam is injected into the interaction circuit to excite the fourth-harmonic electromagnetic waves. According to the cold dispersive diagram, the TE4, 8 mode of the cylindrical waveguide is selected as the operating mode to further suppress the mode competition induced by the fundamental modes, the 2nd harmonic modes and the 3rd harmonic modes. It could be inferred based on the multi-mode time-domain theory that an output power of 1.15 kW can be achieved. The scheme diagram for the hot test is proposed. The LOG is chosen as the electron gun. Particular structure is employed for improving the output efficiency in the interaction circuit.

AB - A design of a 1-THz 4th Harmonic Gyrotron is proposed in this paper. Fourth harmonic interaction is adopted to lower the strength of the external magnet. The magnet can be as low as 10T. Such a low-intensity magnetic field can be easily proposed by a superconduct magnet, which make the generation of continuous waves at 1 THz possible. Seeing that the mode competition is extremely fierce, a large orbit gun is employed as the driven source. An 80-kV, 0.7-A electron beam is injected into the interaction circuit to excite the fourth-harmonic electromagnetic waves. According to the cold dispersive diagram, the TE4, 8 mode of the cylindrical waveguide is selected as the operating mode to further suppress the mode competition induced by the fundamental modes, the 2nd harmonic modes and the 3rd harmonic modes. It could be inferred based on the multi-mode time-domain theory that an output power of 1.15 kW can be achieved. The scheme diagram for the hot test is proposed. The LOG is chosen as the electron gun. Particular structure is employed for improving the output efficiency in the interaction circuit.

KW - gyrotrons

KW - anodes

KW - magnetic fields

KW - superconducting magnets

KW - harmonic analysis

KW - probes

KW - magnetic domains

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U2 - 10.1109/UCMMT49983.2020.9296084

DO - 10.1109/UCMMT49983.2020.9296084

M3 - Conference contribution book

AN - SCOPUS:85099475035

SN - 9781728190655

T3 - 2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies, UCMMT 2020

BT - 2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies, UCMMT 2020

CY - New York

T2 - 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies, UCMMT 2020

Y2 - 29 August 2020 through 1 September 2020

ER -

Li FH, Du CH, Gao ZC, Pan S, Zhu JF, Zhang ZW et al. Development of a 1-THz 4th-harmonic gyrotron. In 2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies, UCMMT 2020. New York. 2020. 9296084. (2020 13th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies, UCMMT 2020). Epub 2020 Sept 1. doi: 10.1109/UCMMT49983.2020.9296084

Development of a 1-THz 4th-harmonic gyrotron

Abstract

Publication series

Conference

Funding

Keywords

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Terahertz High-Harmonic Gyrotron Oscillator By Using Metasurface Cylindrical Cavity (Newton Advanced Fellowship - Prof Chao-Hai Du)

Cite this

Development of a 1-THz 4th-harmonic gyrotron

Abstract

Publication series

Conference

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Projects

Terahertz High-Harmonic Gyrotron Oscillator By Using Metasurface Cylindrical Cavity (Newton Advanced Fellowship - Prof Chao-Hai Du)

Cite this