Soft X-ray Emission Profile and Mode Structure During MHD Events in the TST-2 Spherical Tokamak

H. TOJO; A. EJIRI; Y. TAKASE; Y. TORII; T. OSAKO; M. SASAKI; T. MASUDA; Y. SHIMADA; N. SUMITOMO; J. TSUJIMURA; H. NUGA; S. KAINAGA; J. SUGIYAMA

doi:10.1585/pfr.2.S1065

Regular Articles

Soft X-ray Emission Profile and Mode Structure During MHD Events in the TST-2 Spherical Tokamak

H. TOJO, A. EJIRI, Y. TAKASE, Y. TORII, T. OSAKO, M. SASAKI, T. MASUDA, Y. SHIMADA, N. SUMITOMO, J. TSUJIMURA, H. NUGA, S. KAINAGA, J. SUGIYAMA

Author information

H. TOJO
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
A. EJIRI
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Y. TAKASE
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Y. TORII
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
T. OSAKO
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
M. SASAKI
Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
T. MASUDA
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Y. SHIMADA
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
N. SUMITOMO
Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
J. TSUJIMURA
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
H. NUGA
Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
S. KAINAGA
Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
J. SUGIYAMA
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan

Keywords: IRE, spherical tokamak, SVD, soft X-ray, ion temperature, reconnection

JOURNALS FREE ACCESS

Volume 2 (2007) Pages S1065

DOI https://doi.org/10.1585/pfr.2.S1065

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Abstract

Mode structures during MHD events in the TST-2 spherical tokamak are revealed by means of singular value decomposition. Soft X-ray and magnetic coil signals show growths of modes with toroidal mode numbers n = 1 and 2. Slow evolution of the soft X-ray profile indicates beginning of localized crash. Occurrence of these events is correlated with the spatial gradient of the soft X-ray profile, suggesting that these events are driven by the pressure gradient. Increases in impurity ion temperatures (CIII and OV) are observed. These are positively correlated with the increment of the plasma current during these events.

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