Destruction of Invariant Surfaces and Magnetic Coordinates for Perturbed Magnetic Fields

[摘要] Straight-field-line coordinates are constructed for nearly integrable magnetic fields. The coordinates are based on the robust, noble-irrational rotational-transform surfaces, whose existence is determined by an application of Greene's residue criterion. A simple method to locate these surfaces is described. Sequences of surfaces with rotational-transform converging to low order rationals maximize the region of straight-field-line coordinates.

[发布日期] 2003-11-20 [发布机构] Princeton University. Plasma Physics Laboratory.

[关键词] Magnetic Fields;70 Plasma Physics And Fusion Technology;Chaos;Residues;Magnetic Surfaces