Vladimir B Karalnik
Troitsk Institute for Innovation and Fusion Research (SRC RF TRINITI), Russia
Title: Ultrahigh charging of small spherical grains by the beam-plasma method for creating a compact neutron source
Biography
Biography: Vladimir B Karalnik
Abstract
Generation of high-voltage high-current electron beams in a low-pressure (0.1-1 Torr) gas discharge is studied experimentally as a function of the discharge voltage and the sort and pressure of the plasma forming gas. The density of the plasma formed by a high-current electron beam is measured. Experiments on ultrahigh charging of micro-particles exposed to a pulsed electron beam with an energy of up to 25keV, an electron current density of higher than 1 A/cm2, a pulse duration of up to 1μs, and a repetition rate of up to 1 kHz are described. Spatial evolution of an electron beam in the course of its propagation towards the target is investigated. A numerical model of ultrahigh charging of grains with a radius of 250μm exposed to a high-energy electron beam is developed. The formation of high-energy positive ions in the electric field around of spherical targets is calculated. The calculations performed for a pulse-periodic mode demonstrate the possibility of achieving neutron yields about 109s–1 in the case of 103 spherical grains.
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