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- N. G. Reshetnyak, M. I. Ayzatskiy, V. N. Boriskin, I. A. Chertishchev, A. N. Dovbnya, N. A. Dovbnya, V. P. Romas'ko, V. Zakutin
NSC/KIPT, Kharkov
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The paper presents the results of investigations on the electron beam formation in the magnetron guns with secondary-emission cathodes using the magnetic system based on annular permanent magnets. The magnetic system, made of NdFeB material, has 10 cm in length, external diameter of 80 mm, internal diameter of 60 mm and longitudinal magnetic field amplitude of 800 Oe. Experiments were carried out using the magnetron guns having cathodes with diameters from 6mm to 16 mm, 75 mm in length, and an anode of 56 mm in diameter. The cathode voltage was 15…25 kV. The experimental results have demonstrated that the magnetron guns with cathodes having 6mm, 10mm and 16 mm in diameter can form tubular electron beams. Under the cathode voltage of 18 kV the electron beam current is ~3.5…5 А. The beam current dependence on the voltage obeys to the "3/2" law. As the cathode voltage was increased to 22 kV, the beam current bunch generation and anode current of ~1.0 mks were observed. As a result of investigations a compact magnetron gun with a secondary-emission cathode and a magnetic system on the base of annular permanent magnets was constructed.
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