Drift kinetic effects on the plasma response in high beta spherical tokamak experiments

Wang, Z. R. ; Park, J.-K. ; Menard, J. E. ; Liu, Y. Q.; Kaye, S. M. ; Gerhardt, S.
Issue date: 2017
Creative Commons Attribution 4.0 International (CC BY)
Cite as:
Wang, Z. R., Park, J.-K., Menard, J. E., Liu, Y. Q., Kaye, S. M., & Gerhardt, S. (2017). Drift kinetic effects on the plasma response in high beta spherical tokamak experiments [Data set]. Princeton Plasma Physics Laboratory, Princeton University. https://doi.org/10.11578/1562044
  author      = {Wang, Z. R. and
                Park, J.-K. and
                Menard, J. E. and
                Liu, Y. Q. and
                Kaye, S. M. and
                Gerhardt, S.},
  title       = {{Drift kinetic effects on the plasma resp
                onse in high beta spherical tokamak expe
  publisher   = {{Princeton Plasma Physics Laboratory, Pri
                nceton University}},
  year        = 2017,
  url         = {https://doi.org/10.11578/1562044}

High $\beta$ plasma response to the rotating n=1 external magnetic perturbations is numerically studied and compared with National Spherical Torus eXperiment (NSTX). The hybrid magnetohydrodynamic(MHD)-kinetic modeling shows the drift kinetic effects are important to resolve the disagreement of plasma response between the ideal MHD prediction and the NSTX experimental observation when plasma pressure reaches and exceeds the no-wall limit [F. Troyon et al., Plasma Phys. Control. Fusion \textbf{26}, 209 (1984)]. Since the external rotating fields and high plasma rotation are presented in NSTX experiments, the importance of resistive wall effect and plasma rotation on determining the plasma response is also identified, where the resistive wall suppresses the plasma response through the wall eddy current. The inertial energy, due to plasma rotation, destabilizes the plasma. The complexity of plasma response, in this study, indicates that MHD modeling, including comprehensive physics e.g. the drift kinetic effects, resistive wall and plasma rotation, is essential to reliably predict the plasma behavior in high beta spherical tokamak device.

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