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

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

Division for Experimental Natural Science

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

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.

Original language	English
Article number	2402100
Journal	Plasma and Fusion Research
Volume	11
Issue number	1
DOIs	https://doi.org/10.1585/pfr.11.2402100
Publication status	Published - 2016

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1585/pfr.11.2402100

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title = "Generation of energetic electrons during spherical tokamak merging in UTST",

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.",

author = "Tomohiko Ushiki and Michiaki Inomoto and Kotaro Yamasaki and Xuehan Guo and Takumichi Sugawara and Keita Matsuyama and Haruhisa Koguchi and Takuma Yamada",

note = "Funding Information: This work was supported by the JSPS A3 Foresight Program {"}Innovative Tokamak Plasma Startup and Current Drive in Spherical Torus{"}, Grants-in Aid for Scientific Research (KAKENHI) 15H05750, 15K14279, 26287143, and 25820434, and the NIFS Collaboration Research program( NIFS14KNWP004). The authors would like to thank Enago (www.enago.jp) for the English language review. Publisher Copyright: {\textcopyright} 2016 The Japan Society of Plasma.",

year = "2016",

doi = "10.1585/pfr.11.2402100",

language = "English",

volume = "11",

journal = "Plasma and Fusion Research",

issn = "1880-6821",

publisher = "The Japan Society of Plasma Science and Nuclear Fusion Research (JSPF)",

number = "1",

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TY - JOUR

T1 - Generation of energetic electrons during spherical tokamak merging in UTST

AU - Ushiki, Tomohiko

AU - Inomoto, Michiaki

AU - Yamasaki, Kotaro

AU - Guo, Xuehan

AU - Sugawara, Takumichi

AU - Matsuyama, Keita

AU - Koguchi, Haruhisa

AU - Yamada, Takuma

N1 - Funding Information: This work was supported by the JSPS A3 Foresight Program "Innovative Tokamak Plasma Startup and Current Drive in Spherical Torus", Grants-in Aid for Scientific Research (KAKENHI) 15H05750, 15K14279, 26287143, and 25820434, and the NIFS Collaboration Research program( NIFS14KNWP004). The authors would like to thank Enago (www.enago.jp) for the English language review. Publisher Copyright: © 2016 The Japan Society of Plasma.

PY - 2016

Y1 - 2016

N2 - 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.

AB - 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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U2 - 10.1585/pfr.11.2402100

DO - 10.1585/pfr.11.2402100

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SN - 1880-6821

VL - 11

JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

IS - 1

M1 - 2402100

ER -

Generation of energetic electrons during spherical tokamak merging in UTST

Abstract

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