Electron vortexes in high-current plasma lens

Author

Gonchartov, A.A. ; Litovko, Irina V.

Author_Institution

Inst. of Phys., NASU, Keiv, Ukraine

Volume

27

Issue

4

fYear

1999

fDate

8/1/1999 12:00:00 AM

Firstpage

1073

Lastpage

1078

Abstract

High-current plasma lens (PL) instability of two-dimensional oscillations caused by unremovable radial gradients of the magnetic field and fast ion beams are considered. It is supposed that electron motion is nonlinear and ion motion is linear. The nonlinear differential equation of the electric potential in a hydrodynamical approximation is obtained and its solutions are found for different configurations of external magnetic fields. It is shown that these solutions may be represented in the form of stable vortex structures. Computer models for such kinds of vortices have been created. Creation of vortexes limits maximum values of space electrostatic fields in plasma optics. In the low current regime of the PL with strong ion beam space charge overcompensation, the equation obtained describes nonlinear motion of the electron fluid caused by diocotron instability

Keywords

electric fields; electric potential; plasma devices; plasma instability; plasma oscillations; space charge; vortices; H field strength lines; charge overcompensation; computer models; diocotron instability; dipole vortex structure; drift instability; electric potential; electron vortexes; equipotentialization; external magnetic fields; fast ions; high-current plasma lens instability; hydrodynamical approximation; linear ion motion; long-lived electron vortices; low current regime; magnetic field; momentum aberrations; monopole vortices; nonlinear differential equation; nonlinear electron motion; plasma optics; space electrostatic fields; spherical aberrations; stable vortex; two-dimensional oscillations; unremovable radial gradients; Differential equations; Electric potential; Electron optics; Electrostatics; Ion beams; Lenses; Magnetic fields; Nonlinear optics; Particle beam optics; Plasma stability;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.782284

Filename

782284