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 conferencePaper

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.

Conference

Conference12th UK-Europe-China Workshop on Millimetre Waves and THz Technologies (UCMMT 2019)
Abbreviated titleUCMMT 2019
CountryUnited Kingdom
CityLondon
Period20/08/1922/08/19
Internet address

Fingerprint

harmonics
cavities
liquid nitrogen
Q factors
retarding
interactions
waveguides
cooling
augmentation
simulation

Keywords

  • electron cyclotron maser
  • gyrotron
  • ohmic loss
  • quality factor
  • sectioned cavity
  • terahertz

Cite this

Du, C-H., Li, F-H., Pan, S., Liu, P-K., Zhang, L., He, W-L., ... Cross, A. W. (2019). Study of 1-THz 4th-harmonic gyrotron. Paper presented at 12th UK-Europe-China Workshop on Millimetre Waves and THz Technologies (UCMMT 2019), London, United Kingdom.
Du, Chao-Hai ; Li, Fan-Hong ; Pan, Shi ; Liu, Pu-Kun ; Zhang, Liang ; He, Wen-Long ; Yin, Hua-Bi ; Ronald, K. ; Cross, Adrian W. / Study of 1-THz 4th-harmonic gyrotron. Paper presented at 12th UK-Europe-China Workshop on Millimetre Waves and THz Technologies (UCMMT 2019), London, United Kingdom.3 p.
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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 = "8",
day = "20",
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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",
url = "http://www.ucmmt2019.com",

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Du, C-H, Li, F-H, Pan, S, Liu, P-K, Zhang, L, He, W-L, Yin, H-B, Ronald, K & Cross, AW 2019, 'Study of 1-THz 4th-harmonic gyrotron' Paper presented at 12th UK-Europe-China Workshop on Millimetre Waves and THz Technologies (UCMMT 2019), London, United Kingdom, 20/08/19 - 22/08/19, .

Study of 1-THz 4th-harmonic gyrotron. / Du, Chao-Hai; Li, Fan-Hong; Pan, Shi; Liu, Pu-Kun; Zhang, Liang; He, Wen-Long; Yin, Hua-Bi; Ronald, K.; Cross, Adrian W.

2019. Paper presented at 12th UK-Europe-China Workshop on Millimetre Waves and THz Technologies (UCMMT 2019), London, United Kingdom.

Research output: Contribution to conferencePaper

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

ER -

Du C-H, Li F-H, Pan S, Liu P-K, Zhang L, He W-L et al. Study of 1-THz 4th-harmonic gyrotron. 2019. Paper presented at 12th UK-Europe-China Workshop on Millimetre Waves and THz Technologies (UCMMT 2019), London, United Kingdom.