Adaptive toroidal equilibrium code ATEQ and the X- point effects on the external MHD modes
ORAL
Abstract
A newly developed adaptive toroidal equilibrium code (ATEQ) is presented (Phys. Plasmas {\bf 29} (7), 2022). Comparisons with existing codes, such as TOQ, VMEC, EFIT etc., as well as the Solov\'ev equilibrium solution with X-points, are detailed. An important feature of ATEQ is that the edge safety factor can reach several thousands for configurations with X-points. With ATEQ equilibrium, it then becomes possible to examine the X-points effects on the external MHD modes. The adaptive stability code AEGIS is used for this purpose. The coupling between the external and internal Fourier components is studied for different edge q values by cutting off proper edge portion. The impacts both on the equilibrium and subsequent stability properties with the adaptive equilibrium computation by ATEQ will be discussed.
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Publication: Linjin Zheng, M. T. Kotschenreuther, F. L. Waelbroeck, and Y. Todo, ATEQ: Adaptive Toroidal Equilibrium code, Phys. Plasmas 29(7), in press (2022).
Presenters
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Linjin Zheng
University of Texas at Austin
Authors
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Linjin Zheng
University of Texas at Austin
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Michael T Kotschenreuther
University of Texas at Austin
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Francois L Waelbroeck
University of Texas - Austin, University of Texas, Austin, University of Texas at Austin
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Yasushi Todo
National Institute for Fusion Science, National Insti- tute for Fusion Science, National Institutes of Natural Sciences, Toki, Gifu, Japan