Hydrodynamic derivation of double layers (DL) and electric fields in plasmas

Creation of Electric Fields in Tokamak Plasmas

In conjunction with energy and particle fuelling, considerable mechanical or electromagnetic momenta are transferred to fusion plasmas, e.g. through neutral beam injection, limiter re­ cycling, pellet injection and RF heating. The build up of electric Fields through charge separation in the momentum absorption process is estimated for somewhat simplified cases of neutral particle injection and ...

Propagating double layers in electronegative plasmas

Double layers have been observed to propagate from the source region to the diffusion chamber of a helicon-type reactor filled up with a low-pressure mixture of Ar/SF6 N. Plihon et al., J. Appl. Phys. 98, 023306 2005 . In the present paper the most significant and new experimental results are reported. A fully self-consistent hybrid model in which the electron energy distribution function, the ...

Electric fields in plasmas under pulsed currents.

Electric fields in a plasma that conducts a high-current pulse are measured as a function of time and space. The experiment is performed using a coaxial configuration, in which a current rising to 160 kA in 100 ns is conducted through a plasma that prefills the region between two coaxial electrodes. The electric field is determined using laser spectroscopy and line-shape analysis. Plasma doping...

Ion acoustic waves and double-layers in electronegative expanding plasmas

Relation between magnetic fields and electric currents in plasmas

Maxwell’s equations allow the magnetic field B to be calculated if the electric current density J is assumed to be completely known as a function of space and time. The charged particles that constitute the current, however, are subject to Newton’s laws as well, and J can be changed by forces acting on charged particles. Particularly in plasmas, where the concentration of charged particles is h...