Third-harmonic frequency multiplication of a two-stage tapered gyrotron TWT amplifier

Chan Wook Baik; Seok Gy Jeon; Dae Ho Kim; Nobuyuki Sato; Kuniyoshi Yokoo; Gun Sik Park

doi:10.1109/TED.2005.845861

Third-harmonic frequency multiplication of a two-stage tapered gyrotron TWT amplifier

Chan Wook Baik, Seok Gy Jeon, Dae Ho Kim, Nobuyuki Sato, Kuniyoshi Yokoo, Gun Sik Park

Information Devices Division

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

The frequency multiplication of a two-stage tapered gyrotron traveling wave tube amplifier is experimentally verified in low-voltage and low-current operation. By modulating an axis-encircling electron beam at the fundamental harmonic cyclotron frequency in the input stage, a frequency-tripled signal induced by the third-harmonic component of the modulated beam current is chosen to be extracted from the output stage. Both interaction stages are linearly tapered to improve stability and bandwidth. The third-harmonic frequency multiplication is predicted theoretically and investigated using a self-consistent large-signal theory and a particle-in-cell code simulation, which estimate a pure third-harmonic generation and a power-scaling law. In the experiment, X-band drive signals from 10.6-12 GHz are multiplied by a factor of three to produce Ka-band output frequencies from 31.8-36 GHz, showing reasonable agreement with theoretical predictions for a 30-kV, 160-mA axis-encircling electron beam.

Original language	English
Pages (from-to)	829-838
Number of pages	10
Journal	IEEE Transactions on Electron Devices
Volume	52
Issue number	5
DOIs	https://doi.org/10.1109/TED.2005.845861
Publication status	Published - 2005 May

Keywords

Frequency multiplication
Gyrotron
Gyrotron traveling wave tube (gyro-TWT)
Harmonic frequency

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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@article{a71821865eb84a6a90e40993d09a9419,

title = "Third-harmonic frequency multiplication of a two-stage tapered gyrotron TWT amplifier",

abstract = "The frequency multiplication of a two-stage tapered gyrotron traveling wave tube amplifier is experimentally verified in low-voltage and low-current operation. By modulating an axis-encircling electron beam at the fundamental harmonic cyclotron frequency in the input stage, a frequency-tripled signal induced by the third-harmonic component of the modulated beam current is chosen to be extracted from the output stage. Both interaction stages are linearly tapered to improve stability and bandwidth. The third-harmonic frequency multiplication is predicted theoretically and investigated using a self-consistent large-signal theory and a particle-in-cell code simulation, which estimate a pure third-harmonic generation and a power-scaling law. In the experiment, X-band drive signals from 10.6-12 GHz are multiplied by a factor of three to produce Ka-band output frequencies from 31.8-36 GHz, showing reasonable agreement with theoretical predictions for a 30-kV, 160-mA axis-encircling electron beam.",

keywords = "Frequency multiplication, Gyrotron, Gyrotron traveling wave tube (gyro-TWT), Harmonic frequency",

author = "Baik, {Chan Wook} and Jeon, {Seok Gy} and Kim, {Dae Ho} and Nobuyuki Sato and Kuniyoshi Yokoo and Park, {Gun Sik}",

note = "Funding Information: Manuscript received August 18, 2004; revised October 29, 2004. This work was supported by the Ministry of Science and Technology of the Republic of Korea through the National Research Laboratory Program. The review of this paper was arranged by Editor P. Waller. C. W. Baik is with the Materials and Devices Research Center, Samsung Advanced Institute of Technology, Yongin, Korea. S. G. Jeon, D. H. Kim, and G. S. Park are with the School of Physics, Seoul National University, Seoul 151-747, Korea (e-mail: gunsik@plaza.snu.ac.kr). N. Sato and K. Yokoo are with the Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan. Digital Object Identifier 10.1109/TED.2005.845861 Fig. 1. Dispersion relation of operating waveguide modes and beam modes in each stage for the third-harmonic frequency-multiplying two-stage tapered gyro-TWT amplifier.",

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language = "English",

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T1 - Third-harmonic frequency multiplication of a two-stage tapered gyrotron TWT amplifier

AU - Baik, Chan Wook

AU - Jeon, Seok Gy

AU - Kim, Dae Ho

AU - Sato, Nobuyuki

AU - Yokoo, Kuniyoshi

AU - Park, Gun Sik

N1 - Funding Information: Manuscript received August 18, 2004; revised October 29, 2004. This work was supported by the Ministry of Science and Technology of the Republic of Korea through the National Research Laboratory Program. The review of this paper was arranged by Editor P. Waller. C. W. Baik is with the Materials and Devices Research Center, Samsung Advanced Institute of Technology, Yongin, Korea. S. G. Jeon, D. H. Kim, and G. S. Park are with the School of Physics, Seoul National University, Seoul 151-747, Korea (e-mail: gunsik@plaza.snu.ac.kr). N. Sato and K. Yokoo are with the Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan. Digital Object Identifier 10.1109/TED.2005.845861 Fig. 1. Dispersion relation of operating waveguide modes and beam modes in each stage for the third-harmonic frequency-multiplying two-stage tapered gyro-TWT amplifier.

PY - 2005/5

Y1 - 2005/5

N2 - The frequency multiplication of a two-stage tapered gyrotron traveling wave tube amplifier is experimentally verified in low-voltage and low-current operation. By modulating an axis-encircling electron beam at the fundamental harmonic cyclotron frequency in the input stage, a frequency-tripled signal induced by the third-harmonic component of the modulated beam current is chosen to be extracted from the output stage. Both interaction stages are linearly tapered to improve stability and bandwidth. The third-harmonic frequency multiplication is predicted theoretically and investigated using a self-consistent large-signal theory and a particle-in-cell code simulation, which estimate a pure third-harmonic generation and a power-scaling law. In the experiment, X-band drive signals from 10.6-12 GHz are multiplied by a factor of three to produce Ka-band output frequencies from 31.8-36 GHz, showing reasonable agreement with theoretical predictions for a 30-kV, 160-mA axis-encircling electron beam.

AB - The frequency multiplication of a two-stage tapered gyrotron traveling wave tube amplifier is experimentally verified in low-voltage and low-current operation. By modulating an axis-encircling electron beam at the fundamental harmonic cyclotron frequency in the input stage, a frequency-tripled signal induced by the third-harmonic component of the modulated beam current is chosen to be extracted from the output stage. Both interaction stages are linearly tapered to improve stability and bandwidth. The third-harmonic frequency multiplication is predicted theoretically and investigated using a self-consistent large-signal theory and a particle-in-cell code simulation, which estimate a pure third-harmonic generation and a power-scaling law. In the experiment, X-band drive signals from 10.6-12 GHz are multiplied by a factor of three to produce Ka-band output frequencies from 31.8-36 GHz, showing reasonable agreement with theoretical predictions for a 30-kV, 160-mA axis-encircling electron beam.

KW - Frequency multiplication

KW - Gyrotron

KW - Gyrotron traveling wave tube (gyro-TWT)

KW - Harmonic frequency

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JO - IEEE Transactions on Electron Devices

JF - IEEE Transactions on Electron Devices

SN - 0018-9383

IS - 5

ER -

Third-harmonic frequency multiplication of a two-stage tapered gyrotron TWT amplifier

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