National Institutes of Natural Science, National Institute for Fusion Science
Department of Helical Plasma Research, Fundamental Physics Simulation Research Division

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Best Student Presentation Award at Division 2, the 2012 Fall meeting of the Physical Society of Japan (JPS)

Mr. Masayasu Hata (Graduate Student) won the Best Student Presentation Award at Division 2, the 2012 Fall meeting of the Physical Society of Japan (JPS).
  • Date: Sep. 21, 2012
  • Title:
    Effects of finite electron temperature on magnetic structure

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  • Context:
    Electron MagnetoHydroDynamic (EMHD) model predicts the exact solution of magnetic structure that consists of vortex currents and its associated magnetic fields. These structures are considered to be applicable to electron transport in a high-density plasma. We have been investigating effects of the finite electron temperature on the magnetic structure using two-dimensional PIC code as the temperature was assumed to be zero in the EHMD model. As a result of kinetic simulations, it is found that an induced radial E field and the structural B field causes the E x B drift and it sustains vortex currents. We also conclude that the magnetic structure is less stable in the higher temperature case. In the high temperature plasma, there are many energetic electrons that have the large Larmor radius. These electrons run away outside from the structure, therefore vortex currents and induced magnetic fields are weakened. In general, the structure is stable if the Larmor radius is enough small compared to the structure size. We also estimated the criteria for stability of the magnetic structure by simulations with wide range parameters.


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