Abstract Details
| status: | file name: | submitted: | by: |
|---|---|---|---|
| approved | sherwood2017.pdf | 2017-03-17 18:42:15 | Joshua Burby |
Abstracts
Author: Joshua W. Burby
Requested Type: Poster
Submitted: 2017-03-17 18:19:29
Co-authors: Cesare Tronci
Contact Info:
New York University
251 Mercer Street
New York, NY 10012
USA
Abstract Text:
Hybrid kinetic-MHD models describe the interaction of an MHD bulk fluid with an ensemble of hot particles, which obeys a kinetic equation. In this work we apply Hamilton’s variational principle to formulate new current-coupling kinetic-MHD models in the low-frequency approximation (i.e. large Larmor frequency limit). More particularly, we formulate current-coupling schemes, in which energetic particle dynamics are expressed in either guiding center or gyrocenter coordinates. When guiding center theory is used to model the hot particles, we show how energy conservation requires corrections to the standard magnetization term. On the other hand, charge and momentum conservation in gyrokinetic-MHD lead to extra terms in the usual definition of the hot current density as well modifications to conventional gyrocenter dynamics. All these new features arise naturally from the underlying variational structure of the proposed models.
Comments: