Bulletin of the American Physical Society
2009 APS April Meeting
Volume 54, Number 4
Saturday–Tuesday, May 2–5, 2009; Denver, Colorado
Session S1: Sherwood Poster Session II (2:00pm - 5:00pm)
Monday, May 4, 2009
Room: Plaza Exhibit
Abstract ID: BAPS.2009.APR.S1.15
Abstract: S1.00015 : Three-dimensional computation of toroidal two-fluid internal kink*
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(University of Wisconsin-Madison)
An important outcome of the four-field model is the transition from current-sheet to x-point reconnection during the nonlinear stage of the 1/1 mode in a cylinder . A signature of the transition is a nonlinearly enhanced growth rate computed from the kinetic energy. The results have been confirmed with a full two-fluid model . Here, we generalize the full-model single-helicity cylindrical analysis to three dimensions and toroidal geometry using the NIMROD code. Cylindrical 3D computations maintain helical symmetry; no secondary instabilities arise. Toroidal results are similar, at least in the absence of equilibrium diamagnetic rotation. The nonlinearly increased growth rate in kinetic energy and transition to x-point reconnection are obtained. A sharp but short-lived drop in n=1 magnetic energy also occurs with the two-fluid model at the peak of the n=1 kinetic energy.  A. Y. Aydemir, Phys. Fluids B 4, 3469 (1992).  K. Germaschewski, Bull. Am. Phys. Soc. 53, no. 14, 80 (2008).
*Work supported by U.S. Dept. of Energy.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2009.APR.S1.15
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