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A significant upgrade to the 110 GHz DIII-D ECH system was begun in 2005. Two short pulse (< 2 s) GYCOM gyrotrons were replaced by CPI diode gyrotrons having acceptance parameters of 1.0 MW, 5 s and designed pulse length of 10 s. In addition, a CPI gyrotron with depressed collector, which has demonstrated 1.3 MW for short pulses, was installed and is being tested. Two CPI gyrotrons, which have...
A high power operation of 1.2 MW for 4 s was obtained by a 110 GHz gyrotron with depressed collector on the JT-60 ECRF system, where the cathode voltage is -58 kV without voltage regulation and the acceleration voltage is +85 kV with regulation. The gyrotron is featured by a diamond output window and a RF absorber in its beam tunnel. The RF absorber suppresses the parasitic oscillation, which limited...
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