Identification of a low plasma-rotation threshold for stabilization of the resistive-wall mode

The plasma rotation necessary for stabilization of resistive-wall modes (RWMs) is investigated by controlling the toroidal plasma rotation with external momentum input by injection of tangential neutral beams. The observed threshold is 0.3% of the Alfvén velocity and much smaller than the previous e...

Full description

Saved in:
Bibliographic Details
Published in:Physical review letters 2007-02, Vol.98 (5), p.055002-055002, Article 055002
Main Authors: Takechi, M, Matsunaga, G, Aiba, N, Fujita, T, Ozeki, T, Koide, Y, Sakamoto, Y, Kurita, G, Isayama, A, Kamada, Y
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM INJECTION
CONTROL SYSTEMS
FEEDBACK
PLASMA
ROTATION
STABILIZATION
THERMONUCLEAR REACTORS
WALLS
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The plasma rotation necessary for stabilization of resistive-wall modes (RWMs) is investigated by controlling the toroidal plasma rotation with external momentum input by injection of tangential neutral beams. The observed threshold is 0.3% of the Alfvén velocity and much smaller than the previous experimental results obtained with magnetic braking. This low critical rotation has a very weak beta dependence as the ideal wall limit is approached. These results indicate that for large plasmas such as in future fusion reactors with low rotation, the requirement of the additional feedback control system for stabilizing RWM is much reduced.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.98.055002