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A 300 GHz pulse gyrotron has been developed for collective Thomson scattering diagnostics in the Large Helical Device with a careful design consideration. Single-mode oscillation of more than 320 kW was attained. The frequency spectrum was very narrow and stable across the pulse width up to 80 μs. No parasitic mode was observed during the whole pulse width including the turn-on and turn-off phases...
A high power 300 GHz band pulse gyrotron has been developed based on the design concept for stable and single mode oscillation verified with a prototype gyrotron. The oscillation frequency is 303.3 GHz and the power target is 300 kW. Oscillation test has been carried out and a maximum single mode oscillation power higher than 320 kW was attained. No competing mode was observed during the turn on and...
A low loss transmission line is one of key elements for realization of sub THz band collective Thomson scattering (CTS) diagnostics in large fusion devices. This paper reports transmission tests of corrugated waveguides with 300 GHz band gyrotron power. Two types of corrugated waveguide are considered. One is 1.25 inch corrugated waveguide. The other is 3.5 inch corrugated waveguide already installed...
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