The design of a 390 GHz gyrotron based on a cusp electron gun

Research output: Contribution to conferencePaper

Abstract

A 390 GHz harmonic gyrotron based on a cusp electron gun was designed to operate on a TE71 mode and the 7(th) cyclotron harmonic of a large orbit electron beam. This beam is produced by a cusp electron gun with a voltage of 40 keV, a current of 1.5 A and an adjustable velocity ratio from 1 to 3. Smooth cylindrical waveguide was studied and built as the interaction cavity. The relationship between the cavity dimensions and cavity Q was optimized for output at the design mode. A simple linear output taper with moderate mode conversion was used in the gyrotron output. Both theoretical analysis and numerical simulation results (using the 3D PIC code MAGIC) of this gyrotron will be presented. When the beam thickness and beam spread were introduced into the simulation, competitive modes were observed in the simulation resulting in a drop in the output power. A high frequency (325-500 GHz) VNA was used to measure the millimeter wave properties of the gyrotron cavity and the results are presented in this paper.

Conference

Conference35th International Conference on Infrared, Millimeter and Terahertz Waves
CountryItaly
CityRome
Period5/09/1010/09/10

Fingerprint

electron guns
cusps
cavities
output
harmonics
simulation
tapering
millimeter waves
cyclotrons
electron beams
waveguides
orbits
electric potential
interactions

Keywords

  • TWT amplifier
  • 390 GHz gyrotron
  • cusp electron gun

Cite this

Li, F., He, W., Phelps, A. D. R., Donaldson, C. R., Zhang, L., Cross, A. W., & Ronald, K. (2010). The design of a 390 GHz gyrotron based on a cusp electron gun. Paper presented at 35th International Conference on Infrared, Millimeter and Terahertz Waves, Rome, Italy. https://doi.org/10.1109/ICIMW.2010.5612375
Li, F. ; He, W. ; Phelps, A. D. R. ; Donaldson, C. R. ; Zhang, L. ; Cross, A. W. ; Ronald, K. / The design of a 390 GHz gyrotron based on a cusp electron gun. Paper presented at 35th International Conference on Infrared, Millimeter and Terahertz Waves, Rome, Italy.
@conference{e2e0e73c30064b898d0abff94178a8be,
title = "The design of a 390 GHz gyrotron based on a cusp electron gun",
abstract = "A 390 GHz harmonic gyrotron based on a cusp electron gun was designed to operate on a TE71 mode and the 7(th) cyclotron harmonic of a large orbit electron beam. This beam is produced by a cusp electron gun with a voltage of 40 keV, a current of 1.5 A and an adjustable velocity ratio from 1 to 3. Smooth cylindrical waveguide was studied and built as the interaction cavity. The relationship between the cavity dimensions and cavity Q was optimized for output at the design mode. A simple linear output taper with moderate mode conversion was used in the gyrotron output. Both theoretical analysis and numerical simulation results (using the 3D PIC code MAGIC) of this gyrotron will be presented. When the beam thickness and beam spread were introduced into the simulation, competitive modes were observed in the simulation resulting in a drop in the output power. A high frequency (325-500 GHz) VNA was used to measure the millimeter wave properties of the gyrotron cavity and the results are presented in this paper.",
keywords = "TWT amplifier, 390 GHz gyrotron, cusp electron gun",
author = "F. Li and W. He and Phelps, {A. D. R.} and Donaldson, {C. R.} and L. Zhang and Cross, {A. W.} and K. Ronald",
year = "2010",
doi = "10.1109/ICIMW.2010.5612375",
language = "English",
note = "35th International Conference on Infrared, Millimeter and Terahertz Waves ; Conference date: 05-09-2010 Through 10-09-2010",

}

Li, F, He, W, Phelps, ADR, Donaldson, CR, Zhang, L, Cross, AW & Ronald, K 2010, 'The design of a 390 GHz gyrotron based on a cusp electron gun' Paper presented at 35th International Conference on Infrared, Millimeter and Terahertz Waves, Rome, Italy, 5/09/10 - 10/09/10, . https://doi.org/10.1109/ICIMW.2010.5612375

The design of a 390 GHz gyrotron based on a cusp electron gun. / Li, F.; He, W.; Phelps, A. D. R.; Donaldson, C. R.; Zhang, L.; Cross, A. W.; Ronald, K.

2010. Paper presented at 35th International Conference on Infrared, Millimeter and Terahertz Waves, Rome, Italy.

Research output: Contribution to conferencePaper

TY - CONF

T1 - The design of a 390 GHz gyrotron based on a cusp electron gun

AU - Li, F.

AU - He, W.

AU - Phelps, A. D. R.

AU - Donaldson, C. R.

AU - Zhang, L.

AU - Cross, A. W.

AU - Ronald, K.

PY - 2010

Y1 - 2010

N2 - A 390 GHz harmonic gyrotron based on a cusp electron gun was designed to operate on a TE71 mode and the 7(th) cyclotron harmonic of a large orbit electron beam. This beam is produced by a cusp electron gun with a voltage of 40 keV, a current of 1.5 A and an adjustable velocity ratio from 1 to 3. Smooth cylindrical waveguide was studied and built as the interaction cavity. The relationship between the cavity dimensions and cavity Q was optimized for output at the design mode. A simple linear output taper with moderate mode conversion was used in the gyrotron output. Both theoretical analysis and numerical simulation results (using the 3D PIC code MAGIC) of this gyrotron will be presented. When the beam thickness and beam spread were introduced into the simulation, competitive modes were observed in the simulation resulting in a drop in the output power. A high frequency (325-500 GHz) VNA was used to measure the millimeter wave properties of the gyrotron cavity and the results are presented in this paper.

AB - A 390 GHz harmonic gyrotron based on a cusp electron gun was designed to operate on a TE71 mode and the 7(th) cyclotron harmonic of a large orbit electron beam. This beam is produced by a cusp electron gun with a voltage of 40 keV, a current of 1.5 A and an adjustable velocity ratio from 1 to 3. Smooth cylindrical waveguide was studied and built as the interaction cavity. The relationship between the cavity dimensions and cavity Q was optimized for output at the design mode. A simple linear output taper with moderate mode conversion was used in the gyrotron output. Both theoretical analysis and numerical simulation results (using the 3D PIC code MAGIC) of this gyrotron will be presented. When the beam thickness and beam spread were introduced into the simulation, competitive modes were observed in the simulation resulting in a drop in the output power. A high frequency (325-500 GHz) VNA was used to measure the millimeter wave properties of the gyrotron cavity and the results are presented in this paper.

KW - TWT amplifier

KW - 390 GHz gyrotron

KW - cusp electron gun

U2 - 10.1109/ICIMW.2010.5612375

DO - 10.1109/ICIMW.2010.5612375

M3 - Paper

ER -

Li F, He W, Phelps ADR, Donaldson CR, Zhang L, Cross AW et al. The design of a 390 GHz gyrotron based on a cusp electron gun. 2010. Paper presented at 35th International Conference on Infrared, Millimeter and Terahertz Waves, Rome, Italy. https://doi.org/10.1109/ICIMW.2010.5612375