| Presentation: | submitted: | by: |
|---|---|---|
| cldtps.pdf | 2007-02-21 15:34:14 | Derek Baver |
| hfrcposs.pdf | 2007-02-21 15:32:10 | Derek Baver |
Centrifugal Effects on Local Mode Stability in an FRC
Author: Derek A. Baver
Requested Type: Consider for Invited
Submitted: 2006-12-17 21:53:00
Co-authors:
Contact Info:
University of Wisconsin-Madison
565 S. Perry Pkwy. #4
Oregon, WI 53575
?USA
Abstract Text:
Field-reversed configurations (FRCs) normally rely on non-ideal MHD effects for stability. However, these effects limit attainable device scale, which limits the applicability of this confinement concept as a reactor.
Stability can be affected without scale-dependent effects by rotation. If the rotation is rigid-rotor, there is no free energy source for Kelvin-Helmholtz instability, and Coriolis force scales away for local modes. This permits an energy principle analysis in a centrifugal potential.
This centrifugal potential is expected to produce two principal effects. One is to change the energy balance of local interchange, which can be stabilizing or destabilizing depending on the direction of the density gradient. The other effect is to alter the plasma profile, in particular creating parallel density gradients. The combination of these effects is expected to have a net stabilizing effect provided the temperature profile is not hollow. This is because the density profile is in a relaxed state with respect to the centrifugal potential.
We will investigate the effects these have on local mode stability, and thus determine whether these mechanisms are sufficient to produce a stable FRC in the ideal MHD limit.
Characterization: A1,A2
Comments:
