Study on wideband THz backward wave oscillator driven by pseudospark-sourced sheet electron beam

Jin Zhang; Tianzhong Zhang; Yasir Alfadhl; Xiaodong  Chen; Liang Zhang; Huabi Yin; Adrian W. Cross

doi:10.1109/TED.2020.3005362

Study on wideband THz backward wave oscillator driven by pseudospark-sourced sheet electron beam

Jin Zhang, Tianzhong Zhang, Yasir Alfadhl, Xiaodong Chen, Liang Zhang, Huabi Yin, Adrian W. Cross

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Abstract

A backward wave oscillator (BWO) based on a double-staggered grating (DSG) slow wave structure (SWS) is investigated as a high-power wideband terahertz (THz) source, driven by a sheet electron beam emitting from a pseudospark plasma cathode. First, the DSG SWS is optimized in simulation to have a suitable dispersion characteristic. Then, the BWO with a wideband output structure consisting of a tapered section of DSG and an L-shaped connector is modeled under an operating voltage of 24-38 kV and a current density of 2- 5\times 10 {{7}} A/m 2 (beam current of 1.5-3.8 A). A maximum power of 3.9 kW is obtained, and a wide bandwidth of over 38 GHz (343-381 GHz) is achieved. The impact of fabricating errors of the SWS on the performance of the BWO is analyzed in simulation. The effects of the plasma in the interaction space on the BWO performance are also analyzed, showing that the plasma causes an increase in the oscillation frequency by 1.0-1.2.

Original language	English
Pages (from-to)	3395-3402
Number of pages	8
Journal	IEEE Transactions on Electron Devices
Volume	67
Issue number	8
Early online date	13 Jul 2020
DOIs	https://doi.org/10.1109/TED.2020.3005362
Publication status	Published - 31 Aug 2020

Keywords

THz
backward wave oscillator (BWO)
pseudospark cathode
sheet electron beam
wideband radiation

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10.1109/TED.2020.3005362

Zhang-etal-TED-2020-Study-on-wideband-THz-backward-wave-oscillator-driven-by-pseudospark-sourced-sheet-electron-beamAccepted author manuscript, 2.65 MB

Sheet electron beam vacuum electronic devices for the generation of high power THz radiation
Cross, A. (Principal Investigator), He, W. (Co-investigator), Phelps, A. (Co-investigator) & Zhang, L. (Research Co-investigator)
EPSRC (Engineering and Physical Sciences Research Council)
5/03/19 → 4/03/21
Project: Research

Cite this

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title = "Study on wideband THz backward wave oscillator driven by pseudospark-sourced sheet electron beam",

abstract = "A backward wave oscillator (BWO) based on a double-staggered grating (DSG) slow wave structure (SWS) is investigated as a high-power wideband terahertz (THz) source, driven by a sheet electron beam emitting from a pseudospark plasma cathode. First, the DSG SWS is optimized in simulation to have a suitable dispersion characteristic. Then, the BWO with a wideband output structure consisting of a tapered section of DSG and an L-shaped connector is modeled under an operating voltage of 24-38 kV and a current density of 2- 5\times 10 {{7}} A/m 2 (beam current of 1.5-3.8 A). A maximum power of 3.9 kW is obtained, and a wide bandwidth of over 38 GHz (343-381 GHz) is achieved. The impact of fabricating errors of the SWS on the performance of the BWO is analyzed in simulation. The effects of the plasma in the interaction space on the BWO performance are also analyzed, showing that the plasma causes an increase in the oscillation frequency by 1.0-1.2.",

keywords = "THz, backward wave oscillator (BWO), pseudospark cathode, sheet electron beam, wideband radiation",

author = "Jin Zhang and Tianzhong Zhang and Yasir Alfadhl and Xiaodong Chen and Liang Zhang and Huabi Yin and Cross, {Adrian W.}",

note = "{\textcopyright} 2020 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.",

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doi = "10.1109/TED.2020.3005362",

language = "English",

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AU - Zhang, Jin

AU - Zhang, Tianzhong

AU - Alfadhl, Yasir

AU - Chen, Xiaodong

AU - Zhang, Liang

AU - Yin, Huabi

AU - Cross, Adrian W.

N1 - © 2020 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 - 2020/8/31

Y1 - 2020/8/31

N2 - A backward wave oscillator (BWO) based on a double-staggered grating (DSG) slow wave structure (SWS) is investigated as a high-power wideband terahertz (THz) source, driven by a sheet electron beam emitting from a pseudospark plasma cathode. First, the DSG SWS is optimized in simulation to have a suitable dispersion characteristic. Then, the BWO with a wideband output structure consisting of a tapered section of DSG and an L-shaped connector is modeled under an operating voltage of 24-38 kV and a current density of 2- 5\times 10 {{7}} A/m 2 (beam current of 1.5-3.8 A). A maximum power of 3.9 kW is obtained, and a wide bandwidth of over 38 GHz (343-381 GHz) is achieved. The impact of fabricating errors of the SWS on the performance of the BWO is analyzed in simulation. The effects of the plasma in the interaction space on the BWO performance are also analyzed, showing that the plasma causes an increase in the oscillation frequency by 1.0-1.2.

AB - A backward wave oscillator (BWO) based on a double-staggered grating (DSG) slow wave structure (SWS) is investigated as a high-power wideband terahertz (THz) source, driven by a sheet electron beam emitting from a pseudospark plasma cathode. First, the DSG SWS is optimized in simulation to have a suitable dispersion characteristic. Then, the BWO with a wideband output structure consisting of a tapered section of DSG and an L-shaped connector is modeled under an operating voltage of 24-38 kV and a current density of 2- 5\times 10 {{7}} A/m 2 (beam current of 1.5-3.8 A). A maximum power of 3.9 kW is obtained, and a wide bandwidth of over 38 GHz (343-381 GHz) is achieved. The impact of fabricating errors of the SWS on the performance of the BWO is analyzed in simulation. The effects of the plasma in the interaction space on the BWO performance are also analyzed, showing that the plasma causes an increase in the oscillation frequency by 1.0-1.2.

KW - THz

KW - backward wave oscillator (BWO)

KW - pseudospark cathode

KW - sheet electron beam

KW - wideband radiation

U2 - 10.1109/TED.2020.3005362

DO - 10.1109/TED.2020.3005362

M3 - Article

SN - 0018-9383

VL - 67

SP - 3395

EP - 3402

JO - IEEE Transactions on Electron Devices

JF - IEEE Transactions on Electron Devices

IS - 8

ER -

Study on wideband THz backward wave oscillator driven by pseudospark-sourced sheet electron beam

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Sheet electron beam vacuum electronic devices for the generation of high power THz radiation

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