Development and applications of gyrotrons at FIR UF

Yoshinori Tatematsu^1*

¹FIR, University of Fukui, Fukui, Japan

* Presenter:Yoshinori Tatematsu, email:tatema@fir.u-fukui.ac.jp

Gyrotrons were first developed in Russia in the field of the fusion research. For this purpose, high power output is required as power sources for electron cyclotron heating of fusion plasma and current drive. By the present, MW gyrotrons have been developed. On the other hand, Research Center for Development of Far-Infrared Region, University of Fukui (FIR UF) pursued high frequency and medium power gyrotrons. Till 2005, the center aimed at increasing gyrotron frequency. For this purpose, the Gyrotron FU series was developed in the frequency range of 30 GHz to 889 GHz in the fundamental, second and third harmonic oscillations. The breakthrough of 1 THz oscillation in gyrotron was achieved for the first time in the world with a pulsed magnet with 19 T and second harmonic oscillation.
After achieving 1 THz oscillation, the aim at FIR UF has been turned to development of gyrotrons available for applied researches such as material processing, sensitivity enhancement of nuclear magnetic resonance (NMR), spectroscopy with dynamic nuclear polarization (DNP), and measurements of positronium hyperfine splitting. The gyrotrons developed for those are called as Gyrotron FU CW series and CW G series.
In this presentation, the basic physics of gyrotrons and development and applications of gyrotrons at FIR UF will be introduced.

Keywords: gyrotron, sub-THz, Gaussian beam, gyrotron applications