Title :
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
fDate :
6/1/1996 12:00:00 AM
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 TM0n0 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; TM0n0 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;
Journal_Title :
Plasma Science, IEEE Transactions on
