scholarly journals Strong plasma turbulence and anomalous diffusion in a magnetic field

1979 ◽  
Author(s):  
H. Okuda
Keyword(s):  
Magnetic Field ◽  
Anomalous Diffusion ◽  
Plasma Turbulence

scholarly journals Effects of plasma turbulence on the nonlinear evolution of magnetic island in tokamak

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Minjun J. Choi ◽  
Lāszlo Bardōczi ◽  
Jae-Min Kwon ◽  
T. S. Hahm ◽  
Hyeon K. Park ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Nonlinear Evolution ◽  
Plasma Turbulence ◽  
Magnetized Plasmas ◽  
Tokamak Plasmas ◽  
Magnetic Islands ◽  
Magnetic Island ◽  
Reconnection Site ◽  
Ambient Turbulence

AbstractMagnetic islands (MIs), resulting from a magnetic field reconnection, are ubiquitous structures in magnetized plasmas. In tokamak plasmas, recent researches suggested that the interaction between an MI and ambient turbulence can be important for the nonlinear MI evolution, but a lack of detailed experimental observations and analyses has prevented further understanding. Here, we provide comprehensive observations such as turbulence spreading into an MI and turbulence enhancement at the reconnection site, elucidating intricate effects of plasma turbulence on the nonlinear MI evolution.

scholarly journals The development of magnetic field line wander by plasma turbulence

2017 ◽  
Vol 83 (4) ◽  
Author(s):  
Gregory G. Howes ◽  
Sofiane Bourouaine
Keyword(s):  
Magnetic Field ◽  
Field Line ◽  
Magnetic Field Line ◽  
Large Scale ◽  
Magnetic Energy ◽  
Plasma Turbulence ◽  
Alfven Wave ◽  
Astrophysical Plasmas ◽  
Field Lines ◽  
The Magnetic Field

Plasma turbulence occurs ubiquitously in space and astrophysical plasmas, mediating the nonlinear transfer of energy from large-scale electromagnetic fields and plasma flows to small scales at which the energy may be ultimately converted to plasma heat. But plasma turbulence also generically leads to a tangling of the magnetic field that threads through the plasma. The resulting wander of the magnetic field lines may significantly impact a number of important physical processes, including the propagation of cosmic rays and energetic particles, confinement in magnetic fusion devices and the fundamental processes of turbulence, magnetic reconnection and particle acceleration. The various potential impacts of magnetic field line wander are reviewed in detail, and a number of important theoretical considerations are identified that may influence the development and saturation of magnetic field line wander in astrophysical plasma turbulence. The results of nonlinear gyrokinetic simulations of kinetic Alfvén wave turbulence of sub-ion length scales are evaluated to understand the development and saturation of the turbulent magnetic energy spectrum and of the magnetic field line wander. It is found that turbulent space and astrophysical plasmas are generally expected to contain a stochastic magnetic field due to the tangling of the field by strong plasma turbulence. Future work will explore how the saturated magnetic field line wander varies as a function of the amplitude of the plasma turbulence and the ratio of the thermal to magnetic pressure, known as the plasma beta.

Anomalous diffusion and radial electric field generation due to edge plasma turbulence

2004 ◽  
Vol 44 (13) ◽  
pp. 203-204 ◽  
Author(s):  
R. Pánek ◽  
L. Krlín ◽  
D. Tskhakaya ◽  
S. Kuhn ◽  
J. Stöckel ◽  
...  
Keyword(s):  
Electric Field ◽  
Anomalous Diffusion ◽  
Radial Electric Field ◽  
Plasma Turbulence ◽  
Edge Plasma ◽  
Field Generation ◽  
Electric Field Generation

scholarly journals Anomalous diffusion in microchannel under magnetic field

2010 ◽  
Vol 9 ◽  
pp. 109-112 ◽  
Author(s):  
Caroline Derec ◽  
Matteo Smerlak ◽  
Jacques Servais ◽  
Jean-Claude Bacri
Keyword(s):  
Magnetic Field ◽  
Anomalous Diffusion

scholarly journals Anomalous Diffusion and Oscillations of the Positive Column in a Magnetic Field

1965 ◽  
Vol 14 (5) ◽  
pp. 490-509
Author(s):  
Kiyoshi Yatsui ◽  
Yoshio Inuishi
Keyword(s):  
Magnetic Field ◽  
Anomalous Diffusion ◽  
Positive Column

Hunting for reconnection and energy exchange sites in 3D turbulent outflows

2021 ◽  
Author(s):  
Giovanni Lapenta
Keyword(s):  
Magnetic Field ◽  
Machine Learning ◽  
European Union ◽  
Energy Exchange ◽  
Field Component ◽  
Plasma Turbulence ◽  
Learning Tools ◽  
Horizon 2020 ◽  
Research And Innovation ◽  
Astrophysical Journal

<p>Plasma turbulence is typically characterized by a preferred directon, that of teh magnetic field. Most plasmas have a coherent average field component and turbulence develop over it. Tokamaks are teh archetypical case with their strong toroidal field. But also solar arcades, solr wind, magnetospheres and ionospheres have that same property. We consider here turbulence in 3D reconnection outflows. Reconnection often has a gudie field to begin with, but even without it, in the outflow there is a significant field residual from the process of reconnection. This macroscopic field organizes the plasma turbulence to form a very anistotropic state. We recenlty, investigted the properties of turbulence at different locations [1]. We deploy now innovative machine learning tools to investigate the outflows and detect the presence of secondary reconnection sites and regions of energy exchange.</p><p>[1] Lapenta, G., et al. "Local regimes of turbulence in 3D magnetic reconnection." <em>The Astrophysical Journal</em> 888.2 (2020): 104.</p><p>Work supported by the <span>European Union’s Horizon 2020 research and innovation programme under grant agreement No. 776262 (AIDA, www.aida-space.eu).</span></p>

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