Cooper, W A
Brunetti, D
Duval, B P
Faustin, J M
Graves, J P
Kleiner, A
Patten, H
Pfefferle, D
Porte, L
Raghunathan, M
Reimerdes, H
Sauter, O
Tran, T M
Saturated ideak kink/peeling formations described as three-dimensional magnetohydrodynamic tokamak equilibrium states
Physics of Plasmas
10.1063/1.4945743
23
4
040701
5
Free boundary magnetohydrodynamic equilibrium states with spontaneous three dimensional deformations of the plasma-vacuum interface are computed for the first time. The structures obtained have the appearance of saturated ideal external kink/peeling modes. High edge pres- sure gradients yield toroidal mode number n = 1 corrugations for a high edge bootstrap cur- rent and larger n distortions when this current is small. Deformations in the plasma boundary region induce a nonaxisymmetric Pfirsch-Schlueter current driving a field-aligned current rib- bon consistent with reported experimental observations. A variation in the 3D equilibrium confirms that the n = 1 mode is a kink/peeling structure. We surmise that our calculated equi- librium structures constitute a viable model for the edge harmonic oscillations and outer modes associated with a quiescent H-mode operation in shaped tokamak plasmas.
MHD equilibrium;
three-dimensional;
saturated external kink/peeling;
outer mode;
edge harmonic oscillation;
American Institute of Physics
Melville
2016
http://pop.aip.org/;
https://crpplocal.epfl.ch/pinboard/jpapers/1601501.pdf;