TITLE

The role of the n[lowercase_phi_synonym]=1 column mode in spheromak formation

AUTHOR(S)
Cohen, B. I.; Romero-Talamás, C. A.; Ryutov, D. D.; Hooper, E. B.; LoDestro, L. L.; McLean, H. S.; Stewart, T. L.; Wood, R. D.
PUB. DATE
April 2009
SOURCE
Physics of Plasmas;Apr2009, Vol. 16 Issue 4, p042501
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Observations in strongly driven spheromak experiments and simulations using a time-dependent, three-dimensional, nonlinear, resistive magnetohydrodynamic code indicate that in the formation phase an n[lowercase_phi_synonym]=1 instability (n[lowercase_phi_synonym] is the toroidal Fourier mode) is excited by the current-carrying column injected from the gun region. The growth of the n[lowercase_phi_synonym]=1 column mode terminates in a violent event in which there is significant magnetic reconnection and a topology change. The combined action of the n[lowercase_phi_synonym]=1 kink instability and the reconnection event amplifies the poloidal flux. By means of experimental diagnostics, detailed diagnostics and visualizations in the simulations, and a phenomenological model of the linear perturbations, we investigate the roles of the n[lowercase_phi_synonym]=1 column mode and reconnection in forming the spheromak.
ACCESSION #
38611579

 

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