Current Status of the KIT Coaxial-Cavity Long-Pulse Gyrotron and its Key Components

摘要

Today’s performance requirements for future DEMO gyrotrons are an operating frequency > 200 GHz and an output power of 2 M W. A total gyrotron efficiency of better than 60 % must be achieved. Multi -purpose/multi -frequency operation and frequency step -tunability are required also. It has been shown earlier, that the coaxial -cavity technology is a promising candidate [1] for fut ure fusion power plants . In [1 ] a world record RF output power at 170 GHz of 2.2 MW has been presented in short -pulse operation (~ few milliseconds). However , it has to be proven that the coaxial -cavity technology can be used in steady -state operation . Tha t shall be achieved by upgrading the existing 2 MW 170 GHz sho rt-pulse prototype with a cooling system and the implement a- tion of advanced M agnetron Inje ction Guns (MIGs) [3] . Both, the advanced MIGs as well as the long - pulse gyrotron will show the way towa rds a possible solution for DEMO with a significantly higher output power at higher operating frequencies.