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17–22 Oct 2016
Kyoto International Conference Center
Japan timezone

Penetration and amplification of resonant perturbations in 3D ideal-MHD equilibria

18 Oct 2016, 11:25
20m
Kyoto International Conference Center

Kyoto International Conference Center

Takaragaike, Sakyo-ku, Kyoto 606-0001 Japan
Oral THS - Magnetic Confinement Theory and Modelling: Stability 3D Physics

Speaker

Dr Stuart Hudson (Princeton Plasma Physics Laboratory)

Description

The nature of ideal-MHD equilibria in three-dimensional geometry is profoundly affected by resonant surfaces, which beget a non-analytic dependence of the equilibrium on the boundary. Furthermore, non-physical currents arise in equilibria with continuously-nested magnetic surfaces and smooth pressure and rotational-transform profiles. We demonstrate that three-dimensional, ideal-MHD equilibria with nested surfaces and delta-function current-densities that produce a discontinuous rotational-transform are well defined and can be computed both perturbatively and using fully-nonlinear equilibrium calculations. The results are of direct practical importance: we predict that resonant magnetic perturbations penetrate past the rational surface (i.e. ``shielding'' is incomplete, even in purely ideal-MHD) and that the perturbation is amplified by plasma pressure, increasingly so as stability limits are approached.
Country or International Organization USA
Paper Number TH/1-1

Primary author

Dr Stuart Hudson (Princeton Plasma Physics Laboratory)

Co-author

Dr Joaquim Loizu (Max Planck Institut for Plasma Physic)

Presentation materials