July 27, 2015 to August 21, 2015
Nordita, Stockholm
Europe/Stockholm timezone

Localized Electron heating by strong guide-field magnetic reconnection

Not scheduled
132:028 (Nordita, Stockholm)

132:028

Nordita, Stockholm

Poster Workshop, August 10-14

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)

Presentation materials

There are no materials yet.