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Oct 13 – 18, 2014
Hotel Park Inn Pribaltiyskaya
Europe/Moscow timezone

Accurate Estimation of Tearing Mode Stability Parameters in the KSTAR Using High-Resolution 2-D ECEI Diagnostic

Oct 17, 2014, 2:00 PM
4h 45m
Green 8-9 (Hotel Park Inn Pribaltiyskaya)

Green 8-9

Hotel Park Inn Pribaltiyskaya

Saint Petersburg, Russian Federation
Poster Poster 8

Speaker

Prof. Hyeon K. Park (UNIST)

Description

An accurate method to estimate the tearing mode stability parameters, i.e. the classical stability index (Δ') and the critical width for pressure flattening (w_c), has been developed based on electron cyclotron emission imaging (ECEI) diagnostic in the KSTAR. The measured ECE images of tearing modes are compared with synthetic images reconstructed from the tearing mode T_e model for the estimation. A good agreement between the measurement and model has been obtained, and an accuracy of the estimation result is improved with the 2-D high-resolution ECE images contrast to the 1-D data result. The observed tearing mode is found to be classically stable (r_s Δ'=-1.633±1.265) but have a non-negligible neoclassical drive from the bootstrap current loss (w_c/w ∼0.2).
Paper Number EX/P8-15
Country or International Organisation Korea, Republic of

Primary author

Prof. Hyeon K. Park (UNIST)

Co-authors

Dr Bak Jun-Gyo (National Fusion Research Institute) Dr Calvin Domier (University of California, Davis) Mr Christopher Bowman (University of York) Prof. Gunsu Yun (Pohang University of Science and Technology) Dr Kieran Gibson (University of York) Mr Minjun Choi (Pohang University of Science and Technology) Dr Neville Luhmann (University of California, Davis) Dr Sang-Gon Lee (National Fusion Research Institute) Dr Steven Sabbagh (Columbia University) Dr Woochang Lee (POSTECH) Dr Young-Seok Park (Columbia University)

Presentation materials