1 research outputs found
Non-linear magnetohydrodynamic modeling of plasma response to resonant magnetic perturbations
The interaction of static Resonant Magnetic Perturbations (RMPs) with
the plasma flows is modeled in toroidal geometry, using the non-linear
resistive MHD code JOREK, which includes the X-point and the
scrape-off-layer. Two-fluid diamagnetic effects, the neoclassical
poloidal friction and a source of toroidal rotation are introduced in
the model to describe realistic plasma flows. RMP penetration is studied
taking self-consistently into account the effects of these flows and the
radial electric field evolution. JET-like, MAST, and ITER parameters are
used in modeling. For JET-like parameters, three regimes of plasma
response are found depending on the plasma resistivity and the
diamagnetic rotation: at high resistivity and slow rotation, the islands
generated by the RMPs at the edge resonant surfaces rotate in the ion
diamagnetic direction and their size oscillates. At faster rotation, the
generated islands are static and are more screened by the plasma. An
intermediate regime with static islands which slightly oscillate is
found at lower resistivity. In ITER simulations, the RMPs generate
static islands, which forms an ergodic layer at the very edge (ψ
≥0.96) characterized by lobe structures near the X-point and results
in a small strike point splitting on the divertor targets. In MAST
Double Null Divertor geometry, lobes are also found near the X-point and
the 3D-deformation of the density and temperature profiles is observed