Magnetic field perturbartions in closed-field-line systems with zero toroidal magnetic field
In some plasma confinement systems (e.g., field-reversed configurations and levitated dipoles) the confinement is provided by a closed-field-line poloidal magnetic field. We consider the influence of the magnetic field perturbations on the structure of the magnetic field in such systems and find that the effect of perturbations is quite different from that in the systems with a substantial toroidal field. In particular, even infinitesimal perturbations can, in principle, lead to large radial excursions of the field lines in FRCs and levitated dipoles. Under such circumstances, particle drifts and particle collisions may give rise to significant neoclassical transport. Introduction of a weak regular toroidal magnetic field reduces radial excursions of the field lines and neoclassical transport.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 15013750
- Report Number(s):
- UCRL-JRNL-201347; PHPAEN; TRN: US0801265
- Journal Information:
- Physics of Plasmas, Vol. 11, Issue 5; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
Similar Records
The symmetric quartic map for trajectories of magnetic field lines in elongated divertor tokamak plasmas
Quasilinear theory of electron transport by radio frequency waves and nonaxisymmetric perturbations in toroidal plasmas