Performance Tests of ITER Gyrotrons and Design study of Dual-frequency ITER gyrotron

Performance tests for two ITER gyrotrons have being carried out in the QST. In the tests, the output power of 1.05 MW with efficiency of 50.5 % for 300 s, the output power of 0.9 MW for 60 s in the 5 kHz full-modulation, and operation reliability of more than 90 % were achieved. Design study of dual-frequency gyrotron has been carried out to apply plasma operations at 1.8 T, 2.65 T and 5.3 T in ITER. It succeeded in design values of power transmission efficiencies in 104 GHz and 170 GHz oscillations almost equivalent to the design value in the current ITER gyrotron.