A thermionic electron gun capable of generating a high-quality annular electron beam for quasi-optical CARM and induced-resonance-electron-cyclotron (IREC) maser applications has been designed. The 500-kV, 200-A MIG-type electron gun has a curved emitting surface designed to compensate for radial electric field gradients across the cathode, and should produce an electron beam with v±/vz~ 0.5 and Avz/vz< 1%. The gun is also capable of producing an electron beam suitable for a multimegawatt 250-kV, 100-GHz quasi-optical gyrotron. Results are presented for electron trajectory calculations which have been performed for both the CARM/IREC maser and gyrotron operating regimes.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering