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Physics of Plasmas / Volume 19 / Issue 2 / ARTICLES / Basic Plasma Phenomena, Waves, Instabilities

Phys. Plasmas 19, 022107 (2012); http://dx.doi.org/10.1063/1.3684240 (10 pages)

Modeling the Parker instability in a rotating plasma screw pinch

I. V. Khalzov, B. P. Brown, N. Katz, and C. B. Forest

University of Wisconsin, 1150 University Avenue, Madison, Wisconsin 53706, USA

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(Received 27 November 2011; accepted 10 January 2012; published online 15 February 2012)

We analytically and numerically study the analogue of the Parker (magnetic buoyancy) instability in a uniformly rotating plasma screw pinch confined in a cylinder. Uniform plasma rotation is imposed to create a centrifugal acceleration, which mimics the gravity required for the classical Parker instability. The goal of this study is to determine how the Parker instability could be unambiguously identified in a weakly magnetized, rapidly rotating screw pinch, in which the rotation provides an effective gravity and a radially varying azimuthal field is controlled to give conditions for which the plasma is magnetically buoyant to inward motion. We show that an axial magnetic field is also required to circumvent conventional current driven magnetohydrodynamic (MHD) instabilities such as the sausage and kink modes that would obscure the Parker instability. These conditions can be realized in the Madison plasma Couette experiment (MPCX). Simulations are performed using the extended MHD code NIMROD for an isothermal compressible plasma model. Both linear and nonlinear regimes of the instability are studied, and the results obtained for the linear regime are compared with analytical results from a slab geometry. Based on this comparison, it is found that in a cylindrical pinch, the magnetic buoyancy mechanism dominates at relatively large Mach numbers (M > 5), while at low Mach numbers (M < 1), the instability is due to the curvature of magnetic field lines. At intermediate values of Mach number (1 < M < 5), the Coriolis force has a strong stabilizing effect on the plasma. A possible scenario for experimental demonstration of the Parker instability in MPCX is discussed.

© 2012 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. MODEL
  3. SLAB: IDEAL MHD STABILITY
  4. PERIODIC CYLINDER: IDEAL MHD STABILITY
  5. BOUNDED CYLINDER: DISSIPATIVE MHD STABILITY AND NONLINEAR DYNAMICS
  6. CONCLUSION

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KEYWORDS, PACS, and IPC

Keywords

Coriolis force, kink instability, Mach number, numerical analysis, pinch effect, plasma magnetohydrodynamics, plasma nonlinear processes, plasma simulation, sausage instability

PACS

  • 52.35.Py

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

  • 52.55.Ez

    Theta pinch

  • 52.65.Kj

    Magnetohydrodynamic and fluid equation

  • 52.35.Mw

    Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.)

  • 52.30.Cv

    Magnetohydrodynamics (including electron magnetohydrodynamics)

  • 02.60.-x

    Numerical approximation and analysis

International Patent Classification (IPC)

  • H05H1/02

    Arrangements for confining plasma by electric or magnetic fields; Arrangements for heating plasma

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3684240

PUBLICATION DATA

ISSN

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

Publisher

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

For access to fully linked references, you need to log in.
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