Rotation of a magnetized plasma

Abstract

The plasma rotation in the axial magnetic field of the linear machine Mistral [A. Escarguel, Eur. Phys. J. D 56, 209 (2010)] is well described by the assumption that the electrons injected from the source exit radially from the central column and are subject to the Lorentz force. Electrons and ions rotate together by ambipolarity. The solution of the momentum equations foresees correctly the observed radial dependence of the ionic radial velocity measured by laser induced fluorescence. The resolution of these equations is also in good agreement with the measured dependence of the rotation frequency on the applied magnetic field and on the background pressure.

Time‐Resolved Measurements of Plasma Properties Using Electrostatic Probes in the Cross‐Field Discharge of a Hall Effect Thruster

“…Cross-field discharges are often encountered in the field of plasma physics, for example in Hall effect thrusters for spacecraft propulsion [1], in magnetized plasma columns for fundamental studies of turbulence and instabilities [2], in End-Hall ion sources for plasma processing and coating formation [3], in the edge and the divertor region of a Tokamak reactor [4] and in the magnetic filter region of negative ion sources for neutral beam generation [5]. The present work focuses on Hall effect thrusters.…”

Flow dynamics and magnetic induction in the von-Kármán plasma experiment

“…The plasma collisionality thus allows for an efficient flow drive from the azimuthal J × B torque. Flow drive in other experiments with similar plasma parameters also rely on finite perpendicular plasma conductivity (Klinger et al 1997;Annaratone et al 2011;Collins et al 2012;Zhou et al 2012;Cooper et al 2014).…”

“…Creating plasma flows in magnetized plasmas has been achieved in numerous linear and toroidal magnetized experiments (Klinger et al 1997;Wallace et al 2004;Fredriksen et al 2006;Teodorescu et al 2006;Annaratone et al 2011;Schaffner et al 2012;Zhou et al 2012). In most of these investigations, rotation of the plasma column is achieved by biasing cold limiters, rings or portions of the vacuum vessel.…”

“…In most of these investigations, rotation of the plasma column is achieved by biasing cold limiters, rings or portions of the vacuum vessel. In these studies, the influence of radial plasma flow shear on interchange instability (Teodorescu et al 2006), drift wave instabilities (Klinger et al 1997), turbulent transport (Wallace et al 2004;Schaffner et al 2012;Zhou et al 2012), plasma confinement (Fredriksen et al 2006) or radial transport (Oldenbürger et al 2010;Annaratone et al 2011) has been detailed. Our flow driving scheme will allow to drive plasma rotation in both directions and to extend some of the previous studies in cases with an axial shear of the rotation of the plasma column.…”

Characterisation of coherent rotating modes in a magnetised plasma column using a mono-sensor tomography diagnostic

“…These modes have been interpreted 12 radial electric field qualitatively reproduces the dependences of the mode rotation frequency on the pressure and the magnetic field 15 . Primary electrons play an important role in the apparition of those highly non-linear modes by creating a radial electric field between the negative plasma and the wall 8,9 .…”