Design of a high-efficiency low-voltage axially modulated cusp-injected second-harmonic X-band gyrotron amplifier

Author

Lawson, Wes ; Grigoropoulos, A. ; Liu, A. ; Saraph, Girish P. ; Rodgers, John ; Destler, William W.

Author_Institution

Dept. of Electr. Eng., Maryland Univ., College Park, MD, USA

Volume

24

Issue

3

fYear

1996

fDate

6/1/1996 12:00:00 AM

Firstpage

678

Lastpage

686

Abstract

We present the theoretical design of a second-harmonic small-orbit gyrotron amplifier which utilizes the interactions between a 35-kV 4-A beam and a TE₀₁₁ cavity to produce over 70 kW of amplified power at 9.9 GHz in a 1.83-kG magnetic field. One of the novel features of this device is that the electron gun produces an axially streaming annular beam which is velocity modulated by a short TM_0n0 input cavity. Perpendicular energy is imparted to the beam via a nonadiabatic magnetic transition at the end of a 13-cm drift region. An electronic efficiency of 53% is predicted with a large signal gain near 20 dB by a single particle code which takes into account nonideal effects associated with finite beam thickness and finite magnetic field transition widths

Keywords

electron guns; gyrotrons; microwave amplifiers; 1.83 kG; 20 dB; 35 kV; 4 A; 70 kW; 9.9 GHz; TE₀₁₁ cavity; TM_0n0 input cavity; axially modulated cusp-injected second-harmonic X-band gyrotron amplifier; axially streaming annular beam; beam thickness; electron gun; electronic efficiency; gain; high-efficiency; low-voltage; magnetic field transition widths; nonadiabatic magnetic transition; nonideal effects; theoretical design; Cyclotrons; Electromagnetic heating; Electron beams; Frequency; Gyrotrons; Magnetic fields; Millimeter wave circuits; Millimeter wave radar; Plasma accelerators; Power system harmonics;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.532951

Filename

532951