Progress in the Design of Megawatt-Class Fusion Gyrotrons Operating at the Second Harmonic of the Cyclotron Frequency

In the frame of a EUROfusion Enabling Research Project (ENR) KIT and NKUA are working on new concepts for highly efficient, megawatt-class fusion gyrotron systems that will operate at the 2nd-harmonic of the electron cyclotron frequency. This will reduce the required magnetic flux density by a factor of two and therefore will lead to more compact and cost-efficient gyrotron systems at DEMO relevant and sub-THz frequencies.