Speaker
Mr
Xuehan Guo
(The University of Tokyo)
Description
Magnetic reconnection plays a fundamental role in magnetized plasmas because it
permits magnetic configurations to changes the magnetic field line topology
releasing magnetic stress and energy.
Localized electron heating of magnetic reconnection was studied under strong guide-
field using two merging spherical tokamak plasmas in Univ. Tokyo Spherical Tokamak
(UTST) experiment. Our new slide-type two-dimensional Thomson scattering system,
documented for the first time the electron heating localized around the X-point.
Shape of the high electron temperature area does not agree with ohmic heating
power or that of energy dissipation. If we include a guide-field effect term, the
energy dissipation area becomes localized around the X-point, suggesting that the
electrons are accelerated by the reconnection electric field parallel to the magnetic
field and thermalized by non-collision effect (anomalous resistivity) around the
X-point.
Meanwhile, the chaotic motion of particle plays a key role for producing resistivity
in the no guide-field magnetic reconnection. We found for the first time that the
particle orbit effect can produce the resistivity even in the strong guide-field
condition. This resistivity decreases with the guide-field ratio that agrees with the
experimental results in TS-3 device.
Primary author
Mr
Xuehan Guo
(The University of Tokyo)
Co-authors
Prof.
Michiaki Inomoto
(The University of Tokyo)
Mr
Takumichi Sugawara
(The University of Tokyo)
Prof.
Yasushi Ono
(The University of Tokyo)
