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• W749860180 abstract "Full text: A new and improved 2D microwave imaging system on TEXTOR tokamak plasma demonstrated the unprecedented advantage of high temporal and spatial resolution of 2D images over the conventional 1D data in studies of the physics of the sawtooth crash; The major new findings are; a) The high field side sawtooth crash was re-confirmed. b) The role of the core current density in the theoretical explosive growth rate of the ideal kink or resistive instability may have to be considered to explain the observed multiple reconnection processes and stagnated growth rate of the island during the post-cursor phase of the sawtooth oscillation. (c) The rigid body rotation assumption is well valid and this validation was achieved through variation of the toroidal rotation speed controlled by the toroidal momentum input by the heating beam. Following the successful findings of new physics from the TEXTOR experiments, a state-of-the-art optics design for KSTAR and DIII-D was launched for detailed study of physics. The DIII-D system has already been deployed to study the physics of sawteeth as well as of other MHD modes. The sawtooth results will be compared with the previous studies from TEXTOR where the plasma shape is circular. The first 2D structure of Alfven eigenmodes from the reverse shear regime in DIII-D discharge is a significant preliminary outcome; the results from the 2010 KSTAR campaign will be compared with those from DIII-D as well as TEXTOR. Abundant spatial ({approx} 200 channels), temporal, and frequency information will be utilized to study the fine structure of these modes. The KSTAR system featuring an optical system with a high zoom capability of up to a factor of 3 will be deployed for the 2010 campaign. This system is equipped with twin imaging arrays for simultaneous observation of two different plasma regions and will be used for comparative study of sawtooth physics, Alfven waves, NTMs and ELMs associated with the L/H transition. One of the prime physics goals of the KSTAR system is to explore the fundamentals of the disruption physics in a superconducting tokamak device. The global as well as the detailed local images of the thermal quenching phase of the disruption will assist the construction of a full picture of disruption physics and may provide a preventive measure of this event which is one of the most important issues for ITER as well as DEMO. (author)" @default.
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• W749860180 date "2012-01-01" @default.
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• W749860180 title "Comparative Study of Sawtooth Physics and Alfvén Waves via 2-D ECE Imaging on KSTAR, DIII-D, AUG and TEXTOR" @default.
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