Paramagnetic states of high-current electron beams in a beam-plasma system

Abstract

Results of computer simulation of low-energy high-current electron beam generation in a low-impedance system show that high-current beams shape in paramagnetic states. Low-impedance system consists of a diode with a long plasma anode, just siding with an explosive emission cathode and an auxiliary thermionic cathode. The long plasma anode plays simultaneously the role of the transport channel providing charge neutralisation of high-current beam. Usually, a beam in an external magnetic field behaves as a diamagnetic and forces the magnetic field out of its volume. Earlier it was shown that for some systems it is possible to realise conditions under which the magnetic field is increased inside the volume occupied by the beam. It is accompanied by considerable increase of the magnetic field as compared as external field. The behaviour of beam-plasma system is discussed under different conditions. Computer simulation was performed using PIC code KARAT.