High-Beta Steady-State FRC Plasma Sustained by Rotating Magnetic Field with Spatial High-Harmonic Components

The penetration of an externally applied rotating magnetic field into a plasma cylinder is examined. Steady-state solutions of an appropriate set of magneto-fluid equations show that, provided the amplitude and rotation frequency of the field are suitably chosen, the penetration is not limited by the usual classical skin effect. The enhanced penetration of the rotating field is accompanied by the generation of a unidirectional azimuthal electron current which is totally absent in a purely resistive plasma cylinder.

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Control of the motion of the ions in rotating magnetic field current drive: 1. Steady-state analysis

Plasma Physics and Controlled Fusion ◽

10.1088/0741-3335/42/11/307 ◽

2000 ◽

Vol 42 (11) ◽

pp. 1219-1225 ◽

Cited By ~ 6

Author(s):

W N Hugrass

Keyword(s):

Magnetic Field ◽

Steady State ◽

Current Drive ◽

Rotating Magnetic Field ◽

Steady State Analysis ◽

State Analysis

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Effect of a Rotating Magnetic Field on the Solidified Structure of Al-Si Alloys

Materials Science Forum ◽

10.4028/www.scientific.net/msf.508.263 ◽

2006 ◽

Vol 508 ◽

pp. 263-268 ◽

Cited By ~ 8

Author(s):

Jenő Kovác ◽

András Roósz ◽

János Szőke

Keyword(s):

Magnetic Field ◽

Steady State ◽

Microstructure Evolution ◽

Research Work ◽

Unidirectional Solidification ◽

Rotating Magnetic Field ◽

Electromagnetic Stirring ◽

Convective Conditions ◽

Microstructure Formation ◽

Secondary Dendrite Arm Spacing

The aim of our research work is to study the microstructure formation during casting of technical alloys under diffusive and magnetically controlled convective conditions on earth and in space. Unidirectional solidification experiments under steady-state conditions were performed with Al-Si binary alloys containing three different amounts of Si, using electromagnetic stirring of the melt. The influence of the rotating magnetic field on the microstructure evolution (particularly on the secondary dendrite arm spacing) as compared to experiments without stirring was studied.

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The generation of screw-pinch/high-beta-tokamak configurations using a transverse rotating magnetic field

Nuclear Fusion ◽

10.1088/0029-5515/19/11/018 ◽

1979 ◽

Vol 19 (11) ◽

pp. 1546-1552 ◽

Cited By ~ 20

Author(s):

W.N. Hugrass ◽

I.R. Jones ◽

M.G.R. Phillips

Keyword(s):

Magnetic Field ◽

Rotating Magnetic Field ◽

High Beta

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A steady state field-reversed configuration with rotating magnetic field

Proceedings of 16th International Symposium on Fusion Engineering ◽

10.1109/fusion.1995.534490 ◽

2002 ◽

Author(s):

M. Ohnishi ◽

Y. Yamamoto ◽

K. Yoshikawa ◽

J. Kitagaki ◽

A. Ishida

Keyword(s):

Magnetic Field ◽

Steady State ◽

Rotating Magnetic Field ◽

Field Reversed Configuration

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Steady State Thrust and Impulse Measurements of a 4 kW Rotating Magnetic Field Thruster

AIAA Propulsion and Energy 2021 Forum ◽

10.2514/6.2021-3400 ◽

2021 ◽

Author(s):

Joshua M. Woods ◽

Christopher L. Sercel ◽

Tate Gill ◽

Benjamin Jorns

Keyword(s):

Magnetic Field ◽

Steady State ◽

Rotating Magnetic Field

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The Existence of Non-unique Steady State Solutions to the RMF Current Drive Equations

Australian Journal of Physics ◽

10.1071/ph850157 ◽

1985 ◽

Vol 38 (2) ◽

pp. 157 ◽

Cited By ~ 27

Author(s):

WN Hugrass

Keyword(s):

Magnetic Field ◽

Steady State ◽

Initial Boundary ◽

Skin Depth ◽

Current Drive ◽

Rotating Magnetic Field ◽

Electron Mass ◽

Plasma Cylinder ◽

Initial Boundary Value ◽

Steady State Solutions

It is shown that the value of the d.c. current driven in a plasma cylinder by means of a rotating magnetic field (RMF) is not unique for R/o ;;:; 6 and eB",/vel m ~ R/o, where R is the radius of the plasma cylinder, a is the classical skin depth, Vel is the electron-ion momentum transfer collision frequency, B", is the magnitude of the rotating magnetic field, e is the electron charge and m is the electron mass. This effect is predicted using three distinct approaches: (i) a steady state analysis which ignores the second and higher harmonics of the fields and currents; (ii) a qualitative model which utilizes the analogy between the RMF current drive technique and the operation of the induction motor; (iii) a solution of the initial boundary value equations describing the RMF current drive in cylindrical plasmas.

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