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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 for use in the collective Thomson scattering (CTS) diagnostics in Large Helical Device. The design concept for stable and single mode oscillation was experimentally verified with a prototype tube of 295 GHz at the fundamental harmonic. A highest power approaching 250 kW was realized. Based on the results of the prototype tube, design of the...
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