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High power sub terahertz gyrotrons are under development in FIR-FU for application to CTS. Succeeding to more than 50 kW second harmonic oscillation power at 350 GHz with a demountable tube, a sealed-off gyrotron was newly fabricated and its performance test is now on going.
A novel high power sub-terahertz gyrotron operating at second harmonic resonance was designed. This gyrotron is intended for use as a probe beam source for collective Thomson scattering diagnostics in nuclear fusion plasma research. The resonant cavity mode, cavity radius, and its length were optimized from various aspects such as resonant frequency, coupling between the electron beam and the RF-electric...
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...
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 the first step of this development, a pulse gyrotron using an existing electron gun was constructed and tested. Oscillations with frequencies around 400 GHz was observed at the second harmonic resonance. Several modes were...
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