Study of 1-THz 4th-harmonic gyrotron

Chao-Hai Du; Fan-Hong Li; Shi Pan; Pu-Kun Liu; Liang Zhang; Wen-Long He; Hua-Bi Yin; K. Ronald; Adrian W. Cross

Study of 1-THz 4th-harmonic gyrotron

Chao-Hai Du
, Fan-Hong Li
, Shi Pan
, Pu-Kun Liu
, Liang Zhang
, Wen-Long He
, Hua-Bi Yin
, K. Ronald
, Adrian W. Cross

Research output: Contribution to conference › Paper › peer-review

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Abstract

A preliminary design of a 1-THz gyrotron based on the fourth harmonic operation is presented. The cylindrical-waveguide TE4,8 mode is selected as the operating mode. Considering the weak beam-wave coupling strength in a 4th-harmonic open-cavity interaction circuit at the frequency of 1 THz, this paper proposes applying low-temperature cooling, for example applying liquid nitrogen, to increase the limit of the Q factor and extend the effective length of the cavity resulting in a significant enhancement of the interaction efficiency and suppression of ohmic losses. Applying multi-mode time-domain theory in the simulation, it was found that although the competing third-harmonic TE3,6 mode was excited first, the fourth-harmonic TE4,8 mode finally dominates in the steady state regime.

Original language	English
Number of pages	3
Publication status	Published - 20 Aug 2019
Event	12th UK-Europe-China Workshop on Millimetre Waves and THz Technologies (UCMMT 2019) - Queen Mary University of London, London, United Kingdom Duration: 20 Aug 2019 → 22 Aug 2019 http://www.ucmmt2019.com

Conference

Conference	12th UK-Europe-China Workshop on Millimetre Waves and THz Technologies (UCMMT 2019)
Abbreviated title	UCMMT 2019
Country/Territory	United Kingdom
City	London
Period	20/08/19 → 22/08/19
Internet address	http://www.ucmmt2019.com

Keywords

electron cyclotron maser
gyrotron
ohmic loss
quality factor
sectioned cavity
terahertz

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title = "Study of 1-THz 4th-harmonic gyrotron",

abstract = "A preliminary design of a 1-THz gyrotron based on the fourth harmonic operation is presented. The cylindrical-waveguide TE4,8 mode is selected as the operating mode. Considering the weak beam-wave coupling strength in a 4th-harmonic open-cavity interaction circuit at the frequency of 1 THz, this paper proposes applying low-temperature cooling, for example applying liquid nitrogen, to increase the limit of the Q factor and extend the effective length of the cavity resulting in a significant enhancement of the interaction efficiency and suppression of ohmic losses. Applying multi-mode time-domain theory in the simulation, it was found that although the competing third-harmonic TE3,6 mode was excited first, the fourth-harmonic TE4,8 mode finally dominates in the steady state regime.",

keywords = "electron cyclotron maser, gyrotron, ohmic loss, quality factor, sectioned cavity, terahertz",

author = "Chao-Hai Du and Fan-Hong Li and Shi Pan and Pu-Kun Liu and Liang Zhang and Wen-Long He and Hua-Bi Yin and K. Ronald and Cross, \{Adrian W.\}",

year = "2019",

month = aug,

day = "20",

language = "English",

note = "12th UK-Europe-China Workshop on Millimetre Waves and THz Technologies (UCMMT 2019), UCMMT 2019 ; Conference date: 20-08-2019 Through 22-08-2019",

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TY - CONF

T1 - Study of 1-THz 4th-harmonic gyrotron

AU - Du, Chao-Hai

AU - Li, Fan-Hong

AU - Pan, Shi

AU - Liu, Pu-Kun

AU - Zhang, Liang

AU - He, Wen-Long

AU - Yin, Hua-Bi

AU - Ronald, K.

AU - Cross, Adrian W.

PY - 2019/8/20

Y1 - 2019/8/20

N2 - A preliminary design of a 1-THz gyrotron based on the fourth harmonic operation is presented. The cylindrical-waveguide TE4,8 mode is selected as the operating mode. Considering the weak beam-wave coupling strength in a 4th-harmonic open-cavity interaction circuit at the frequency of 1 THz, this paper proposes applying low-temperature cooling, for example applying liquid nitrogen, to increase the limit of the Q factor and extend the effective length of the cavity resulting in a significant enhancement of the interaction efficiency and suppression of ohmic losses. Applying multi-mode time-domain theory in the simulation, it was found that although the competing third-harmonic TE3,6 mode was excited first, the fourth-harmonic TE4,8 mode finally dominates in the steady state regime.

AB - A preliminary design of a 1-THz gyrotron based on the fourth harmonic operation is presented. The cylindrical-waveguide TE4,8 mode is selected as the operating mode. Considering the weak beam-wave coupling strength in a 4th-harmonic open-cavity interaction circuit at the frequency of 1 THz, this paper proposes applying low-temperature cooling, for example applying liquid nitrogen, to increase the limit of the Q factor and extend the effective length of the cavity resulting in a significant enhancement of the interaction efficiency and suppression of ohmic losses. Applying multi-mode time-domain theory in the simulation, it was found that although the competing third-harmonic TE3,6 mode was excited first, the fourth-harmonic TE4,8 mode finally dominates in the steady state regime.

KW - electron cyclotron maser

KW - gyrotron

KW - ohmic loss

KW - quality factor

KW - sectioned cavity

KW - terahertz

M3 - Paper

T2 - 12th UK-Europe-China Workshop on Millimetre Waves and THz Technologies (UCMMT 2019)

Y2 - 20 August 2019 through 22 August 2019

ER -

Study of 1-THz 4th-harmonic gyrotron

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