An Iron-Free Magnetron-Injection-Gun for a 28GHz, 200kW Gyroklystron Amplifier |
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Authors: | S. H. Lee J. J. Choi W. K. Han S. W. Baek |
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Affiliation: | (1) High Power Microwave Engineering Laboratory, Department of Radio Sciences and Engineering, Kwangwoon University, Seoul, 139-701, Korea |
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Abstract: | A design study of a double-anode magnetron-injection-gun is performed to incorporate the electron gun into a high power 28GHz gyroklystron amplifier operating at 70kV and 8.2A. The electron gun is designed to be used in a tapered magnetic field in the cathode region produced from an iron-free superconducting magnet. An electron trajectory code predicts a beam axial velocity spread of 5.9% at = 1.5, 70kV, 8.2A and 10.4kG, which is a high quality electron beam suitable for the high gain, high efficiency, five-cavity gyroklystron amplifier. The successful design of the high quality electron gun is attributed to a longer gap between the modulating anode and the grounded anode compared with the case of the first 28GHz electron gun built with an iron enclosed electromagnet. |
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