Title :
Progress of the development of gyrotron and gyrotron system for ITER
Author :
Kajiwara, Ken ; Oda, Yasuhisa ; Kasugai, Atsushi ; Takahashi, Koji ; Sakamoto, Keishi
Author_Institution :
Japan Atomic Energy Agency, Naka, Japan
Abstract :
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.
Keywords :
Tokamak devices; gyrotrons; superconducting coils; superconducting magnets; ITER; KSTAR Tokamak; RF; anode-cathode short-circuited switch; auxiliary systems; coil; dual-frequency gyrotron; frequency 137 GHz; frequency 170 GHz; frequency 5 kHz; gyrotron system; high order mode gyrotron; plasma; power 1 MW; power 540 kW; power 600 kW; power 760 kW; power supply development; power supply system; superconducting magnet; time 10 s; Anodes; Frequency modulation; Gyrotrons; Oscillators; Radio frequency; Tokamaks; Dual-frequency; Gyrotron; ITER; frequency change; modulation;
Conference_Titel :
Vacuum Electronics Conference (IVEC), 2012 IEEE Thirteenth International
Conference_Location :
Monterey, CA
Print_ISBN :
978-1-4673-0188-6
Electronic_ISBN :
978-1-4673-0187-9
DOI :
10.1109/IVEC.2012.6262092
