Bulletin of the American Physical Society
49th Annual Meeting of the Division of Plasma Physics
Volume 52, Number 11
Monday–Friday, November 12–16, 2007; Orlando, Florida
Session GO3: DIII-D Tokamak
9:30 AM–12:30 PM,
Tuesday, November 13, 2007
Rosen Centre Hotel Room: Salon 9/10
Chair: Earl Marmar, Massachusetts Institute of Technology
Abstract ID: BAPS.2007.DPP.GO3.3
Abstract: GO3.00003 : Resistive Wall Mode and Plasma Stability at High $\beta $ and Slow Rotation*
9:54 AM–10:06 AM
Preview Abstract Abstract
R.J. La Haye
DIII-D experiments extended the observation of resistive wall mode (RWM) stabilization by slow plasma rotation to various scenarios, including high-$\beta $ advanced tokamak scenarios, and confirmed that magnetic feedback increases stability against equilibrium disturbances, such as large ELMs. At high $\beta $, magnetic disturbances that resonant with marginally stable RWM can lead, depending on torque input and momentum confinement, to loss of torque balance followed by plasma locking, perturbation growth, and confinement loss. Reconnection may take place once plasma is locked. Magnetic feedback can maintain or quickly restore axisymmetry and avoid locking. With very low torque input, however, error field threshold for locking may be below feedback sensitivity. Residual uncorrected error fields may explain why minimum sustainable rotation profiles are generally higher than those predicted by ideal-plasma RWM stability theory.
*Supported by the US DOE under DE-FG02-89ER53297, DE-AC02-76CH03073, DE-FC02-04ER54698, and DE-FG02-03ER83657.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.DPP.GO3.3
The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.
1 Physics Ellipse, College Park, MD 20740-3844
Editorial Office 1 Research Road, Ridge, NY 11961-2701 (631) 591-4000
Office of Public Affairs 529 14th St NW, Suite 1050, Washington, D.C. 20045-2001 (202) 662-8700