Title :
Generation of high power sub terahertz radiation from a gyrotron at second harmonic resonance
Author :
Saito, Teruo ; Notake, Takashi ; Tatematsu, Yoshinori ; Fujii, Akihoto ; Ogasawara, Shinya ; Agusu, L. ; Idehara, Toshitaka ; Manuilov, Vladimir N.
Author_Institution :
Res. Center for Dev. of Far-Infrared Region, Univ. of Fukui, Fukui, Japan
Abstract :
A high power sub terahertz pulse gyrotron is under development in FIR-FU for application to collective Thomson scattering from a high density plasma in the large helical device. As a step to the final goal, a second harmonic gyrotron using a newly designed electron gun was fabricated aiming at 50 kW at around 400 GHz. Oscillation modes were carefully selected from the view point of mode separation. The electron optics was also considered in detail. Then, experiments have proved single mode oscillation of second harmonic modes and oscillation power of 50 kW at 349 GHz and 40 kW at 390 GHz.
Keywords :
Thomson effect; electron guns; electron optics; gyrotrons; plasma density; terahertz wave generation; Thomson scattering; electron gun; electron optics; frequency 400 GHz; high density plasma; oscillation mode; power 50 kW; pulse gyrotron; second harmonic resonance mode; sub terahertz radiation generation; Electromagnetic scattering; Electron beams; Electron optics; Frequency; Gyrotrons; Optical scattering; Power generation; Power system harmonics; Resonance; Voltage;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves, 2009. IRMMW-THz 2009. 34th International Conference on
Conference_Location :
Busan
Print_ISBN :
978-1-4244-5416-7
Electronic_ISBN :
978-1-4244-5417-4
DOI :
10.1109/ICIMW.2009.5325748
