A Computer Simulation on Microinstabilities and Anomalous Resistivity near the Magnetic Neutral Sheet
スポンサーリンク
概要
- 論文の詳細を見る
An investigation on microinstabilities in a field-reversed plasma is performed by using a 2-D magnetostatic particle code. The reversed magnetic field is maintained by both the electron and ion diamagnetic currents, and the ion temperature is assumed to be higher than the electron temperature with a view of applying to the magnetosphere. It is observed that a flute instability occurs in local regions with steep density gradient off the neutral sheet; its frequency is approximately the lower-hybrid frequency and the wavelength is near the electron Larmor radius. The observed dispersion relation suggests that the instability must be the lower-hybrid-drift instability (LHDI). The initial laminar diamagnetic current is rapidly disturbed to form E×B electron vortices, with simultaneous electron and ion acceleration in the neutral sheet. On the neutral line where the plasma Beta is extremely large, an unstable electromagnetic mode is observed to develop after the LHDI saturates; accordingly, the magnetic neutral line is deformed into a meandering structure. Anomalous resistivity and anomalous plasma transport are observed associated with the development of the LHDI; even on the neutral line there exists a small but finite resistivity which is attributed to the unstable magnetic mode. It is found that the resistivity η increases as η^<∝>(V_<di>/v_<thi>)^<1.9>, where V_<di> is the diamagnetic drift speed of ions and v_<thi> is the ion thermal speed; the resistivity increases as T_i/T_e (>1) increases. Significant heating is also observed aronud the neutral line, which can be ascribed to the energy conversion from the magnetic field energy via the induced electric field.
- 核融合科学研究所の論文
著者
-
Tanaka Motohiko
Geophysics Research Laboratory University Of Tokyo
-
Sato Tetsuya
Institute for Fusion Theory, Hiroshima University
-
Kamimura Tetsuo
Institute Of Plasma Physics Nagoya University
-
Kamimura Tetsuo
Institute Of Plasma Physics
-
Sato Tetsuya
Institute For Fusion Theory Hiroshima University
関連論文
- Two Dimensional Behavior of Solitons in a Low-β Plasma with Convective Motion
- Dynamics of Two-Dimensional Solitary Vortices in a Low-β Plasma with Convective Motion
- A Simulation of Driven Reconnection by a High Precision MHD Code
- Stochasticity and Symmetry of the Standard Map : Part I. Classical Aspects : New Trends in Chaotic Dynamics of Hamiltonian Systems
- Particle Simulation Studies on Behaviour of Rapidly-Expanding High-Beta Plasma Column in a Uniform Magnetic Field
- Streaming Tearing Mode
- A 3D STUDY OF SPINNING SPHEROMAK
- Nonlinear Evolution of the Kink Ballooning Mode in a Toroidal Plasma
- Nonlinear Evolution of the Resistive MHD Modes in a Toroidal Plasma
- MACROSCALE PARTICLE SIMULATION OF KINETIC ALFVEN WAVES
- Plasma Simulation by Macroscale, Electromagnetic Particle Code and its Application to Current-Drive by Relativistic Electron Beam Injection
- A Computer Simulation on Microinstabilities and Anomalous Resistivity near the Magnetic Neutral Sheet
- Anomalous Plasma Transport Due to Electron Temperature Gradient Instability
- Propagation of Nonlinear Ion Acoustic Wave with Generation of Long-Wavelength Waves
- An Asymptotic Method for the Vlasov Equation. : III. Transition from Amplitude Oscillation to Linear Landau Damping
- Monte Carlo Simulation of Plasma Confinement in Mirror an Cusp Fields
- Kinetic Effects on the Convective Plasma Diffusion and the Heat Transport
- Spheromak Tilting Instability and Magnetic Reconnection:Simulation and Experiment
- Anomalous Plasma Transport due to Electron Temperature Gradient Instability
- Preface
- A Three Dimensional Study of Spinning Spheromak