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

F. Li; W. He; A. D. R. Phelps; C. R. Donaldson; L. Zhang; A. W. Cross; K. Ronald

doi:10.1109/ICIMW.2010.5612375

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

F. Li, W. He, A. D. R. Phelps, C. R. Donaldson, L. Zhang, A. W. Cross, K. Ronald

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

1 Citation (Scopus)

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.

Original language	English
DOIs	https://doi.org/10.1109/ICIMW.2010.5612375
Publication status	Published - 2010
Event	35th International Conference on Infrared, Millimeter and Terahertz Waves - Rome, Italy Duration: 5 Sept 2010 → 10 Sept 2010

Conference

Conference	35th International Conference on Infrared, Millimeter and Terahertz Waves
Country/Territory	Italy
City	Rome
Period	5/09/10 → 10/09/10

Keywords

TWT amplifier
390 GHz gyrotron
cusp electron gun

Access to Document

10.1109/ICIMW.2010.5612375

High Power MM And Sub-MM Wave Amplifiers For High Frequency ESR/DNP, High Resolution Radar and Remote Sensing
Phelps, A. (Principal Investigator), Cross, A. (Co-investigator), Ronald, K. (Co-investigator) & Donaldson, C. (Researcher)
EPSRC (Engineering and Physical Sciences Research Council)
1/04/09 → 31/03/13
Project: Research
Compression of frequency modulated pulses using a high order helically corrugated waveguide
Cross, A. (Principal Investigator), Phelps, A. (Co-investigator), Ronald, K. (Co-investigator) & Zhang, L. (Researcher)
EPSRC (Engineering and Physical Sciences Research Council)
1/10/06 → 30/09/10
Project: Research

Cite this

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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",

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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

T2 - 35th International Conference on Infrared, Millimeter and Terahertz Waves

Y2 - 5 September 2010 through 10 September 2010

ER -

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

Abstract

Conference

Keywords

Access to Document

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Projects

High Power MM And Sub-MM Wave Amplifiers For High Frequency ESR/DNP, High Resolution Radar and Remote Sensing

Compression of frequency modulated pulses using a high order helically corrugated waveguide

Cite this