On the toroidal current density flowing across a poloidal-magnetic-field null in an axisymmetric plasma
- Associacao Euratom-IST, Instituto de Plasmas e Fusao Nuclear, Instituto Superior Tecnico, Universidade Tecnica de Lisboa, 1049-001 Lisboa (Portugal)
The axisymmetry condition and two of Maxwell's equations are used to show that, in general, there are no nested magnetic surfaces around a poloidal-magnetic-field null for a sufficiently small value of the toroidal current density flowing there. Hence, the toroidal current density at the axis of a magnetic configuration with extreme shear reversal cannot continuously approach zero unless nested surfaces are first broken or particular values are assigned to boundary conditions and other plasma parameters. The threshold of the toroidal current-density at which the topology changes is shown to be set by such parameters, and some examples of the predicted topology transition are presented using analytical solutions of the Grad-Shafranov equation.
- OSTI ID:
- 22130411
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 4 Vol. 20; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Analytic description of high poloidal beta equilibrium with a natural inboard poloidal field null
Equilibrium poloidal field distributions in reversed-field-pinch toroidal discharges
Fixed boundary toroidal plasma equilibria with toroidal flows
Journal Article
·
Wed Dec 14 23:00:00 EST 2005
· Physics of Plasmas
·
OSTI ID:20782389
Equilibrium poloidal field distributions in reversed-field-pinch toroidal discharges
Technical Report
·
Wed Mar 31 23:00:00 EST 1982
·
OSTI ID:5223263
Fixed boundary toroidal plasma equilibria with toroidal flows
Journal Article
·
Fri Apr 15 00:00:00 EDT 2016
· Physics of Plasmas
·
OSTI ID:22599130