Formation of narrow low-energy high-intensity electron beams |
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Authors: | G. E. Ozur S. A. Popov V. F. Fedushchak |
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Affiliation: | (1) State Key Laboratory for Advanced Metals and Materials, Department of Materials Physics, University of Science and Technology Beijing, 100083 Beijing, China;(2) Department of Physics, Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University, 100084 Beijing, China; |
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Abstract: | The process of formation of high-density low-energy (5–10 keV) pulsed electron beams of small diameter (on the order of a few millimeters) in a gun of the “channel-spark” type is studied. It is shown that beams with a rate of rise of the current exceeding 1011 A/s and an amplitude exceeding the Alfvén current by a factor of 1.5–2.0 can be obtained in experiments with intense preionisation of the transport channel combined with a pulsed supply of the accelerating voltage to the cathode. In the optimal pressure mode, the current density at a distance of 2–3 cm from the gun outlet is 40–25 kA/cm2, which will ensure ablation of most solid targets. |
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