Advanced magnetron injection guns for coaxial gyrotrons and gyroklystrons

This paper describes work on the improvement of emission uniformity in magnetron injection guns (MIGs) for gyrotrons, and on an inverted MIG for coaxial gyrotrons. High-power gyrotrons and gyroklystrons are currently in development for a number of RF applications. The annular electron beam for these devices are created with a MIG operating temperature limited, which means the emission current is a function of the localised temperature. Efficient operation of gyrotrons and gyroklystrons requires a high-quality electron beam with low-velocity spread and uniform current density around the circumference of the beam.