Development of a 1.5 MW gyrotron at 110 GHz

High-power, long-pulse or CW millimeter-wave sources are required for electron cyclotron heating (ECH) and current drive in magnetic fusion experiments. Gyrotron oscillators have served as effective sources in this area for many years. Current experiments require unit power levels on the order of 1-2 MW. At CPI, we have successfully developed and delivered several high-power gyrotrons at 84 GHz, 140 GHz and 110 GHz. These gyrotrons deliver power levels in the range from 500 kW to 1 MW. To further reduce system cost and improve reliability we are currently developing and building a prototype 110 GHz, 1.5 MW gyrotron that extends the power-handling capabilities of the earlier 110 GHz, 1 MW design. The basic design of the 110 GHz, 1.5 MW gyrotron is similar to that of the earlier 110 GHz, 1 MW devices, but it utilizes a depressed-collector configuration.