News
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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