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Title: Magnetic plasma expulsion

 [1]; ORCiD logo [1]
  1. Department of Physics, University of North Texas, Denton, Texas 76203, USA
Publication Date:
Sponsoring Org.:
OSTI Identifier:
Grant/Contract Number:
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 1; Related Information: CHORUS Timestamp: 2018-01-16 14:05:38; Journal ID: ISSN 1070-664X
American Institute of Physics
Country of Publication:
United States

Citation Formats

Phillips, R. E., and Ordonez, C. A.. Magnetic plasma expulsion. United States: N. p., 2018. Web. doi:10.1063/1.5006887.
Phillips, R. E., & Ordonez, C. A.. Magnetic plasma expulsion. United States. doi:10.1063/1.5006887.
Phillips, R. E., and Ordonez, C. A.. 2018. "Magnetic plasma expulsion". United States. doi:10.1063/1.5006887.
title = {Magnetic plasma expulsion},
author = {Phillips, R. E. and Ordonez, C. A.},
abstractNote = {},
doi = {10.1063/1.5006887},
journal = {Physics of Plasmas},
number = 1,
volume = 25,
place = {United States},
year = 2018,
month = 1

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on January 16, 2019
Publisher's Accepted Manuscript

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  • When the density at the ion Bernstein wave (IBW) antenna is relatively low, mode transformation of the electron plasma wave to the IBW is sensitive to the density gradient scale length, and hence to ponderomotive effects. A second-order nonlinear ordinary differential equation that describes mode transformation at the lower-hybrid layer, including self-consistent ponderomotive density profile modification, is solved for the rf electrostatic potential in front of the IBW antenna, for the particular case of heating just below the second harmonic of the deuterium cyclotron frequency. The complex antenna impedance and a local reflectivity are calculated, assuming vacuum within the antennamore » box. These calculations reveal diminished antenna coupling to the IBW with increasing ponderomotive density expulsion, as compared to the linear prediction. The ponderomotive force increases the density gradient in the edge plasma, thus enhancing reflection and lowering the loading resistance. The model also describes the direct launch of IBWs in high edge density regimes, lacking a lower-hybrid layer, where the impedance is found to be much smaller than in the low density regime. {copyright} {ital 1998 American Institute of Physics.}« less
  • The vanishing of generalized helicity is shown to be the necessary and sufficient condition for a perfect conductor to display perfect diamagnetism, considered to be the defining attribute of a conventional superconductor. Although conventional superconductivity is brought about by quantum correlations in classical systems, prepared in the state of zero initial helicity (helicity is a constant of the motion for a perfect conductor), it can mimic the superconductor's behavior.
  • The axial penetration of an azimuthal magnetic field into a short-duration hollow cylindrical plasma is studied. When the process is so fast that the ion motion is small and the plasma dissipative resistivity, electron inertia, and pressure are small, the evolution of the magnetic field is governed by the Hall field. When the radial current flows inward, the magnetic field penetrates in the form of a Hall-induced shock wave with a narrow current channel. When outward, the magnetic field does not penetrate the plasma. Moreover, in the latter case the magnetic field is expelled from an initially magnetized plasma. Themore » increase and decrease of the magnetic field intensity in the cylindrical plasma are shown to result naturally from the frozen-in law.« less
  • The spatial evolution of an isolated plasma released from a region of large magnetic field has been investigated using a two-dimensional electrostatic particle code with a fixed nonuniform magnetic field. In general, the plasmoid is seen to accelerate and cool in accordance with the predictions of magnetohydrodynamic theory for a low-..beta.. plasma. However, it is found that two trailing plasma edges with their associated polarization charges are gradually shed leaving wakes of oppositely rotating vortices several Larmor radii in diameter.