Progress of the development of gyrotron and gyrotron system for ITER
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A high power gyrotron and a power supply system have been developed for ITER. Recently, two gyrotrons are fabricated. One is a 170 GHz-TE31,12 high order mode gyrotron. The other is a 170 GHz-TE31,11 and 137 GHz-TE25,9 dual-frequency gyrotron. The 170 GHz-TE31,12 gyrotron is loaned in KSTAR tokamak and 600 kW/10 s RF was injected into the plasma. The dual-frequency gyrotron was achieved 760 kW/46 %/20 s for 170 GHz and 540 kW/42 %/20 s for 137 GHz. Both gyrotrons successfully generate 1 MW power in a short pulse. The development of a power supply and auxiliary systems are also underway. A 5kHz 100% beam on/off modulation is achieved by using an anode-cathode short-circuited switch. A high speed frequency change with a super conducting magnet that has an insert coil inside the bore is demonstrated.
[1] Ken Kajiwara,et al. Steady-state operation of 170 GHz–1 MW gyrotron for ITER , 2008 .
[2] Yasuhisa Oda,et al. Development of Dual-Frequency Gyrotron with Triode Magnetron Injection Gun , 2011 .
[3] Ken Kajiwara,et al. Achievement of robust high-efficiency 1|[thinsp]|MW oscillation in the hard-self-excitation region by a 170|[thinsp]|GHz continuous-wave gyrotron , 2007 .