Development of submillimeter wave gyrotrons and their application to submillimeter wave spectroscopy

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In this project, we have developed frequency-tunable, medium power, submillimeter wave gyrotrons an applied them to submillimeter wave spectroscopy. In the process, the collaboration between Fukui University and University of Sydney playd an important and fundamental roles.1) Ultra-high frequency operation of gyrotron by the second and the third harmonics Using 12T and 17T superconducting magnets, we developed high frequency gyrotrons whose frequencies are close to 1 Terahertz. We have achieved the highest frequency of 847 GHz. This frequency is the world record of high frequency operation of gyrotron.2) cw operation of gyrotronWe have realized complete cw operation of the gyrotron and succeeded to achieve stabilities of amplitude and frequency of the gyrotron output, in order to apply the gyrotron to submillimeter wave spectroscopy as radiation source.3) Amplitude and frequency modulations of the submillimeter wave gyrotron outputWe have achived amplitude and frequency modulations of the gyrotron output for its application to wider fields.4) Studies on mode competition and mode cooperation between the fundamental and the second harmonic operations5) Development of quasi-optical transmission system for submillimeter wave gyrotrons outputs6) Development of a high sensitive detector in a millimeter wave range using a high T_c superconductor7) Plasma scattering measurement using a submillimeter wave gyrotron as a radiation sourceWe have applied the submillimeter wave scattering measurement system using our gyrotron (GYROTRON FU II) as a radiation source for CHS in National Institute for Fusion Science and succeeded in measurement of drift wave excited spontaneously in the device.8) Study on the millimeterr wave ESR using a gyrotron as a radiation source