Magnetic axis safety factor of finite beta spheromaks and transition from spheromaks to toroidal magnetic bubbles 

Paul Bellan Submitted: 20150206 07:39
The value of the safety factor on the magnetic axis of a finitebeta spheromak is shown to be a function of beta in contrast to what was used in P. M. Bellan, Phys. Plasmas 9, 3050 (2002); this dependence on beta substantially reduces the gradient of the safety factor compared to the previous calculation. The method for generating finitebeta spheromak equilibria is extended to generate equilibria describing toroidal magnetic 'bubbles' where the hydrodynamic pressure on the magnetic axis is less than on the toroid surface. This 'anticonfinement' configuration can be considered an equilibrium with an inverted beta profile and is relevant to interplanetary magnetic clouds as these clouds have lower hydrodynamic pressure in their interior than on their surface.
Authors: Paul M. Bellan and Roberto Paccagnella
Projects: None

Publication Status: to appear in Physics of Plasmas
Last Modified: 20150206 11:50


