Development program for a 200kW, CW gyrotron

A millimeter wave device to produce 200 kW of continuous wave power at 60 GHz was developed. The device, a gyrotron oscillator, will be compatible with power delivery to an electron cyclotron heated plasma. Smooth control of RF power over a 17 dB range is required, and the device should be capable of operation into a severly time varying load mismatch. Long pulse testing continues on gyrotrons S/N 1A and 2A. While testing S/N 1A at 181 kW and 60 ms pulse width, a window failure occurred which attributed to a faulty arch detector. Long pulse testing up to 207 kW is achieved, on S/N 2A at 100 ms pulse width.