Generation of Energetic Electrons during Spherical Tokamak Merging in UTST

Tomohiko USHIKI; Michiaki INOMOTO; Kotaro YAMASAKI; Xuehan GUO; Takumichi SUGAWARA; Keita MATSUYAMA; Haruhisa KOGUCHI; Takuma YAMADA

doi:10.1585/pfr.11.2402100

Regular Articles

Generation of Energetic Electrons during Spherical Tokamak Merging in UTST

Tomohiko USHIKI, Michiaki INOMOTO, Kotaro YAMASAKI, Xuehan GUO, Takumichi SUGAWARA, Keita MATSUYAMA, Haruhisa KOGUCHI, Takuma YAMADA

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Keywords: spherical tokamak, plasma merging, energetic electron, magnetic reconnection

JOURNAL FREE ACCESS

2016 Volume 11 Pages 2402100

DOI https://doi.org/10.1585/pfr.11.2402100

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Abstract

Bursts of bremsstrahlung soft X-ray (SXR) emission (>200 eV) were observed during spherical tokamak merging in the University of Tokyo Spherical Tokamak (UTST) experiment. SXR signal waveforms coincided well with the time evolution of a reconnection electric field, and their intensity shows a clear dependence on the strength of a toroidal magnetic field. This result suggests that electrons near the X-point are effectively accelerated in the toroidal direction by a parallel electric field during plasma merging in the presence of a strong toroidal magnetic field.

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