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Title: Dynamics of a high-current relativistic electron beam

The dynamics of a high-current relativistic electron beam is studied experimentally and by numerical simulation. The beam is formed in a magnetically insulated diode with a transverse-blade explosive-emission cathode. It is found experimentally that the radius of a 500-keV beam with a current of 2 kA and duration of 500 ns decreases with time during the beam current pulse. The same effect was observed in numerical simulations. This effect is explained by a change in the shape of the cathode plasma during the current pulse, which, according to calculations, leads to a change in the beam parameters, such as the electron pitch angle and the spread over the longitudinal electron momentum. These parameters are hard to measure experimentally; however, the time evolution of the radial profile of the beam current density, which can be measured reliably, coincides with the simulation results. This allows one to expect that the behavior of the other beam parameters also agrees with numerical simulations.
Authors:
 [1] ;  [2] ; ;  [1]
  1. Russian Academy of Sciences, Prokhorov General Physics Institute (Russian Federation)
  2. Russian Academy of Sciences, Joint Institute for High Temperatures (Russian Federation)
Publication Date:
OSTI Identifier:
22472275
Resource Type:
Journal Article
Resource Relation:
Journal Name: Plasma Physics Reports; Journal Volume: 41; Journal Issue: 6; Other Information: Copyright (c) 2015 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BEAM CURRENTS; CATHODES; COMPUTERIZED SIMULATION; CURRENT DENSITY; ELECTRIC CURRENTS; ELECTRON BEAMS; ELECTRONS; INCLINATION; KEV RANGE; PLASMA; PLASMA SIMULATION; RELATIVISTIC RANGE