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

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

JOURNAL FREE ACCESS

2007 Volume 2 Pages S1065

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

Details

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.

Corresponding author

Register with J-STAGE for free!