Title :
Submillimeter-wave harmonic gyrotron experiment
Author :
Spira-Hakkarainen, S. ; Kreischer, Kenneth E. ; Temkin, Richard J.
Author_Institution :
Plasma Fusion Center, MIT, Cambridge, MA, USA
fDate :
6/1/1990 12:00:00 AM
Abstract :
A theoretical and experimental investigation of the operation of a harmonic gyrotron at submillimeter wavelengths is reported. Using a waveguide cavity with an iris at the output end of the straight section, 14 different second-harmonic modes were observed with frequencies of 301-503 GHz, output powers of 1-22 kW, and a 12-MHz emission frequency bandwidth. The highest output power was 22 kW, with a total efficiency of 3.5% at 467 GHz, and an output power of 15 kW with a 6% efficiency was obtained at 417 GHz. Research was conducted using a 65-75 kV up to 10-A electron gun with a 1/1.5-μs pulse length and a 4-Hz repetition rate, which produced a helical electron beam in magnetic fields of up to 14 T. These results represent the first operation of a high-power harmonic gyrotron in the submillimeter region
Keywords :
gyrotrons; harmonic generation; microwave generation; submillimetre wave devices; 1 to 22 kW; 10 A; 12 MHz; 14 T; 3.5 percent; 301 to 503 GHz; 417 GHz; 467 GHz; 6 percent; 65 to 75 kV; electron gun; harmonic gyrotron; helical electron beam; iris; second-harmonic modes; submillimeter wavelengths; waveguide cavity; Cyclotrons; Electromagnetic heating; Electron beams; Free electron lasers; Frequency; Gyrotrons; Laser radar; Magnetic fields; Masers; Power generation;
Journal_Title :
Plasma Science, IEEE Transactions on
