| Paper | Title | Page |
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THPSC54 |
Studies on Radially-Directed Electron Beam Formation in the Secondary-Emission Source | |
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| The present paper describes the experimental and theoretical data on radial electron beam formation in a secondary-emission source during the beam transport in a decreasing magnetic field of the solenoid. The magnetron gun with a secondary-emission cathode, 36 mm in diameter, and a 78 mm anode, was used as an electron source. The beam transport was performed in the system for two cases. In the first case, the system consisted of 5 rings with an inside diameter 66 mm and of width 30 mm; and in the second case, the system included 15 copper rings of inside diameter 66 mm and 8 mm wide, and was at a distance of 85 mm from the anode of the magnetron gun. In the second case, for realization of the local decrease of the solenoidal field a scattered magnetic field was used, the magnetic field being produced by a SmCO5 permanent magnet. The beam current and its distribution along the length of ring system were investigated as functions of the magnetic field amplitude and the gradient of field decrease in the electron energy range from 35 till 85 keV. The mode of electron current bunch formation was also studied. A mathematical model of electron flow motion in the decreasing field has been constructed. Numerical results are found to be in satisfactory agreement with the experimental data. | ||