Stabilization of interchange modes by rotating magnetic fields.
Interchange modes have been a key limiting instability for many magnetic confinement fusion configurations. In previous studies intended to deal with these ubiquitous instabilities, complex, transport enhancing, minimum-B producing coils were added to the otherwise simple linear mirror plasma. Possible solutions for returning to a simple symmetric mirror configuration, such as ponderomotive fields, are weak and difficult to apply. A new method is demonstrated here for the first time, utilizing rotating magnetic fields that are simple to apply and highly effective. A simple and easily comprehensible theory has also been developed to explain the remarkable stabilizing properties. Although this work has been performed on field reversed configurations, it should have a wide application to other confinement schemes, and could become a cornerstone for high-beta plasma stability.
Guo
H Y
HY
Redmond Plasma Physics Laboratory, University of Washington, Seattle, WA 98195, USA.
Hoffman
A L
AL
Milroy
R D
RD
Miller
K E
KE
Votroubek
G R
GR