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Design of an electron gun for a 280 GHz induced-resonance-electron-cyclotron (IREC) maser experiment

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3 Author(s)
R. B. McCowan ; US Naval Res. Lab., Washington, DC, USA ; R. A. Pendleton ; A. W. Fliflet

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 νz≈0.5 and Δνzz<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

Published in:

IEEE Transactions on Electron Devices  (Volume:39 ,  Issue: 7 )