Research on a Grided Cusp Electron Gun for 263 GHz Gyrotron Traveling-Wave Amplifiers
An electron gun is designed for gyrotron traveling-wave amplifiers operating at 263 GHz based on a laboratory superconducting magnet.Through theoretical analysis of the electron gun and exten-sive simulations by using MATLAB,POISSON SUPERFISH and Trak Charged Particle Toolkit,the effects of different structural parameters and magnetic fields on the transverse-to-longitudinal velocity ratio and the dispersion of electron beam are discussed.The values of magnetic field and emitter parameters are determined,and the optimization of performance parameters is accelerated.A grided electron gun is ob-tained,which can meet the design requirements and has practical engineering applications.In the magnetic field distribution when the currents of the main coil,collector coil,and cathode coil in the superconducting magnet are 51.253 A,the electron gun is expected to generate a large cyclotron-electron beam of 25 kV and 0.5 A,with a transverse-to-longitudinal velocity ratio of 1.1 and a dispersion of 6.36%under a bias voltage of 1 kV and a certain initial emission angle dispersion.When the grided electron gun is at a bias voltage below-64 V,the electron beam is completely cut off.
Large cyclotron-electron beamCusp electron gunGyrotron traveling-wave amplifierGy-rotron
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