Structure of an Electron Beam Formed in a High-Current Diode with Arc Plasma Sources Built-In to a Cathode

• Published in: Plasma physics reports Vol. 49; no. 11; pp. 1453 - 1457
• Main Authors: Kiziridi, P. P., Ozur, G. E., Shnaider, A. V.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-11-2023; Springer Nature B.V
• Subjects: Applied Physics; Atomic; Beamforming; Cathodes; Density distribution; Electron beams; Energy distribution; High current; Magnetic fields; Magnetic induction; Molecular; Optical and Plasma Physics; Physics; Physics and Astronomy; Thermal imaging; guide magnetic field; beam focusing; high-current electron beam; explosive emission; arc plasma sources; thermal imaging
• ISSN: 1063-780X; 1562-6938
• DOI: 10.1134/S1063780X2360144X

The distributions of the current and energy densities of low-energy (up to 30 keV), high-current (up to 20 kA) electron beam of microsecond duration have been studied with the use of thermal imaging and wide-band oscilloscope. It was shown that energy density distribution is quite uniform (inside the circle of 2.5 cm in diameter that is closer to the outer diameter of cathode emitting part) at the guide magnetic field compared or somewhat higher in induction to the beam self-magnetic field. In the case of low guide magnetic field or its absence, the beam focuses and its energy density distribution becomes sharp non-uniform. It was also shown that even low magnetic field (about 25 mT) stabilizes the beam position in cross section. Any micro- non-uniformities of millimeter scale were not observed in the energy density distributions.