Nonlinear acceleration of the electron inertia-dominated magnetohydrodynamic modes due to electron parallel compressibility

Journal Article · Thu Sep 15 04:00:00 EDT 2005 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.2042167· OSTI ID:20764534

Matsumoto, Taro; Naitou, Hiroshi; Tokuda, Shinji; Kishimoto, Yasuaki ^[1]

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1. Department of Fusion Plasma Research, Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Mukouyama 801-1, Naka City 311-0193 (Japan)

The behavior of the collisionless magnetohydrodynamics modes is investigated by the gyrokinetic particle simulation in a cylindrical tokamak plasma in the parameter region where the effects of electron inertia and electron parallel compressibility are competitive for magnetic reconnection. Although the linear growth of the m=1 internal kink-tearing mode is dominated by the electron inertia, it is found that the growth rate can be nonlinearly accelerated due to the electron parallel compressibility proportional to the ion sound Larmor radius {rho}{sub s}. It is also found that, as decreasing the electron skin depth {delta}{sub e}, the maximum growth rate before the internal collapse saturates independently of the microscopic scales such as {delta}{sub e} and {rho}{sub s}. The acceleration of growth rate is also observed in the nonlinear phase of the m=2 double tearing mode.

• OSTI ID: 20764534
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 9 Vol. 12; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ACCELERATION
CHARGED-PARTICLE TRANSPORT
COMPRESSIBILITY
CYLINDRICAL CONFIGURATION
DEPTH
ELECTRONS
IONS
KINK INSTABILITY
LARMOR RADIUS
MAGNETIC CONFINEMENT
MAGNETIC RECONNECTION
MAGNETOHYDRODYNAMICS
MOMENT OF INERTIA
NONLINEAR PROBLEMS
PLASMA
PLASMA SIMULATION
SOUND WAVES
TEARING INSTABILITY
TOKAMAK DEVICES