Three-Dimensional Reconnection And Relaxation Of Merging Spheromak Plasmas

Authors

Timothy G. Gray , '01
Vyacheslav S. Lukin , '00
Michael R. Brown, Swarthmore CollegeFollow
C. D. Cothran

Document Type

Article

Publication Date

10-1-2010

Published In

Physics Of Plasmas

Abstract

Plasma relaxation inside a highly conducting cylindrical boundary is studied both experimentally and computationally. Dynamics are initiated by the introduction of two equal helicity spheromaks at either end of the cylinder. In the experiment, dense, high-magnetic-flux spheromaks are injected into the flux conserving volume with magnetized plasma guns. In the simulation, identical spheromaks initially occupy both halves of the cylinder and a perturbation is introduced. Merging commences with a single three-dimensional null-point that moves radially out of the flux conserving volume at velocities up to 0.2 of the reconnection outflow velocity. Relaxation to the minimum energy state occurs in about ten Alfven times. An important conclusion is that even though the dynamical activity is limited to a few modes, this activity is sufficient to promote relaxation to the final, minimum energy state. The dynamical activity appears to conserve magnetic helicity while magnetic energy is converted to flow and heat. The final state arrived at dynamically is identical to that described by C. D. Cothran et al. [Phys. Rev. Lett. 103, 215002 (2009)] using static, eigenvalue analysis. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3492726]

Comments

This work is freely available courtesy of the American Physical Society Division of Plasma Physics and the American Institute of Physics.

Recommended Citation

Timothy G. Gray , '01 et al. (2010). "Three-Dimensional Reconnection And Relaxation Of Merging Spheromak Plasmas". Physics Of Plasmas. Volume 17, Issue 10. DOI: 10.1063/1.3492726
https://works.swarthmore.edu/fac-physics/108