Plasma Physics Seminar

Dr. Hyeon K. Park, POSTECH, Korea
Physics of Incomplete Reconnection Process of the Sawtooth Crash and Recent Results from the KSTAR 2-D ECE Imaging System



Study of the sawtooth physics via the upgraded Electron Cyclotron Emission Imaging (ECEI) system on TEXTOR tokamak plasmas revealed new information concerning the sawtooth crash process. This includes: 1) The details of incomplete reconnection process with a wide range of crash time scales up to the resistive time scale 2) observation of reversal of the toroidal rotation with co-injection tangential-neutral beam. Subsequently, ECEI systems based on the TEXTOR upgraded system have been developed for DIII-D, ASDEX-UPGRADE (AUG) and Korean Superconducting Tokamak Advanced Research (KSTAR) to study various magnetohydrodynamic (MHD) instabilities. In particular, the KSTAR ECEI system revealed various MHD physics in the core (sawtooth crash and e-fishbones) and edge (filamentation in ELMs and edge sheared rotation layers in H-mode operation).



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