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Physics of Plasmas / Volume 12 / Issue 5 / INVITED PAPERS / Magnetically Confined Plasmas, Heating, Confinement

Phys. Plasmas 12, 056109 (2005); http://dx.doi.org/10.1063/1.1882312 (8 pages)

Three-dimensional magnetohydrodynamic simulations of the Helicity Injected Torus with Steady Inductive drive a

a Paper PI1B 4, Bull. Am. Phys. Soc. 49, 287 (2004).
V. A. Izzo and T. R. Jarboe

University of Washington, Box 352250, Seattle, Washington 98195

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(Received 18 November 2004; accepted 31 January 2005; published online 13 April 2005)

The Helicity Injected Torus with Steady Inductive drive (HIT-SI) [ P. E. Sieck, W. T. Hamp, V. A. Izzo, T. R. Jarboe, B. A. Nelson, R. G. O’Neill, A. J. Redd, and R. J. Smith, IEEE Conference Record—Abstracts. 31st IEEE International Conference On Plasma Science (IEEE Catalog No. 04CH37537), 2004, p. 160 ] is a spheromak driven by steady inductive helicity injection (SIHI) and consists of the toroidally symmetric spheromak confinement region and two nonsymmetric helicity injectors. The three-dimensional (3D) magnetohydrodynamic code NIMROD [ A. H. Glasser, C. R. Sovinec, R. A. Nebel, T. A. Gianakon, S. J. Plimpton, M. S. Chu, and D. D. Schnack, Plasma Phys. Controlled Fusion, 41, A747 (1999) ] is used to simulate HIT-SI operation, but the code’s toroidally symmetric boundary requires a creative treatment of the injectors. Sustained HIT-SI operation is simulated with nonaxisymmetric boundary conditions. In driven simulations at low Lundquist number S no n = 0 fields are generated as a result of relaxation of the predominantly n = 1 injector fields until the injectors are quickly shut off. At S = 500, an n = 0 component arises due to relaxation during sustainment. As S is increased further, the ratio of n = 0 (equilibrium) fields to n = 1 (injector) fields increases. The effects of a thin insulating boundary layer on the plasma decay time are also discussed.

© 2005 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. DESCRIPTION OF BOUNDARY CONDITIONS
    1. Normal magnetic fields
    2. Electric fields
    3. Resistive edge layer
  3. LOW S SIMULATIONS
    1. Simulation parameters
    2. Energy spectra
    3. Decay time predictive model
    4. Magnetic field lines
  4. HIGHER S SIMULATIONS
    1. Simulation parameters
    2. Energy spectra
    3. Toroidal current and flux
    4. Magnetic field lines
  5. DISCUSSION

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KEYWORDS and PACS

Keywords

plasma magnetohydrodynamics, plasma simulation, plasma toroidal confinement, plasma boundary layers, plasma transport processes, plasma instability

PACS

  • 52.55.Wq

    Current drive; helicity injection

  • 52.55.Ip

    Spheromaks

  • 52.40.Hf

    Plasma-material interactions; boundary layer effects

  • 52.35.Py

    Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)

  • 52.30.Cv

    Magnetohydrodynamics (including electron magnetohydrodynamics)

  • 52.65.Kj

    Magnetohydrodynamic and fluid equation

  • 52.25.Fi

    Transport properties

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1882312

PUBLICATION DATA

ISSN

1070-664X (print)  
1089-7674 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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