Current-driven rotating-kink mode in a plasma column with a non-line-tied free end
Furno, I × Intrator, T. P Ryutov, D. D Abbate, S Madziwa-Nussinov, T Light, A Dorf, L Lapenta, Giovanni #
American physical soc
Physical review letters vol:97 issue:1
First experimental measurements are presented for the kink instability in a linear plasma column which is insulated from an axial boundary by finite sheath resistivity. An instability threshold below the classical Kruskal-Shafranov threshold, axially asymmetric mode structure, and rotation are observed. These are accurately reproduced by a recent kink theory, which includes axial plasma flow and one end of the plasma column that is free to move due to a non-line-tied boundary condition.