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

Simultaneous Measurement of the ELMs at Both High and Low Field Sides and ELM Dynamics in ELM Crash-Free Period in KSTAR

Oct 17, 2014, 11:05 AM
20m
Blue 1-5 (Hotel Park Inn Pribaltiyskaya)

Blue 1-5

Hotel Park Inn Pribaltiyskaya

Saint Petersburg, Russian Federation

Speaker

Mr Hyeon Park (Republic of Korea)

Description

Following successful characterization of the growth, saturation and bursting process of the Edge Localized Mode (ELM) [1] by a 2D/3D Electron Cyclotron Emission Imaging (ECEI) system in KSTAR H-mode plasmas, the observed mode structure is verified via synthetic image reconstruction based on the BOUT++ code. In successive KSTAR campaigns, a wide range of toroidal mode numbers (~4 < n < ~16) of the ELMs have enabled the establishment of the relationship between the poloidal and toroidal mode numbers (m, n) through the local magnetic shear (safety factor - q) (<m>=nq). ELM dynamics observed simultaneously at both high and low field sides revealed necessity of the Pfirsh-Schlüter flow, shear suppression of high n modes and inconsistency in mode numbers suggested further study. In KSTAR campaigns, Magnetic Perturbation (MP) coils with n=1 and n=2 structures successfully suppressed the ELMs. In the ELM suppressed period, persisting mode structures accompanied with weak bursting behaviours were observed.
Paper Number EX/8-1
Country or International Organisation Korea, Republic of

Primary author

Mr Hyeon Park (Republic of Korea)

Co-authors

C.W. Domier (UCD) Prof. Gunsu Yun (POSTECH) Ms J.E. Lee (POSTECH) Mr Jaehyun Lee (POSTECH) Minjun Choi (POSTECH) Mr Minwoo Kim (POSTECH) Dr S.G. Lee (NFRI) Dr S.W. Yoon (NFRI) Prof. W. Lee (POSTECH) Dr X.Q. Xu (LLNL) Dr Y.M. Jeon (NFRI) Prof. nevelle Luhmann, Jr. (UCD)

Presentation materials