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Title: ACTIVE FEEDBACK STABILZATION OF THE RESISTIVE WALL MODE ON THE DIII-D DEVICE

ACTIVE FEEDBACK STABILZATION OF THE RESISTIVE WALL MODE ON THE DIII-D DEVICE A proof of principle magnetic feedback stabilization experiment has been carried out to suppress the resistive wall mode (RWM), a branch of the ideal magnetohydrodynamic (MHD) kink mode under the influence of a stabilizing resistive wall, on the DIII-D tokamak device [Plasma Phys. and Contr. Fusion Research (International Atomic Energy Agency, Vienna, 1986), p. 159]. The RWM was successfully suppressed and the high beta duration above the no wall limit was extended to more than 50 times the resistive wall flux diffusion time. It was observed that the mode structure was well preserved during the time of the feedback application. Several lumped parameter formulations were used to study the feedback process. The observed feedback characteristics are in good qualitative agreement with the analysis. These results provide encouragement to future efforts towards optimizing the RWM feedback methodology in parallel to what has been successfully developed for the n = 0 vertical positional control. Newly developed MHD codes have been extremely useful in guiding the experiments and in providing possible paths for the next step.
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Publication Date:
OSTI Identifier:OSTI ID: 806657
DOE Contract Number:AC03-99ER54463
Resource Type:Conference
Resource Relation:Conference: 42nd Annual Meeting of the Division of Plasma Physics, Quebec City, Quebec (CA), 11/23/2000--11/27/2000; Other Information: THIS PAPER IS AN INVITED PAPER PRESENTED AT THE 42ND ANNUAL MEETING OF THE DIVISION OF PLASMA PHYSICS, NOVEMBER 23-27, 2000 IN QUEBEC CITY, CANADA, AND TO BE PUBLISHED IN PHYSICS PLASMAS.; PBD: 1 Nov 2000
Research Org:GENERAL ATOMICS (US)
Sponsoring Org:(US)
Country of Publication:United States
Language:English
Subject: 29 ENERGY PLANNING, POLICY AND ECONOMY; DIFFUSION; DOUBLET-3 DEVICE; FEEDBACK; MAGNETOHYDRODYNAMICS; NUCLEAR ENERGY; PHYSICS; PLASMA; STABILIZATION; TOKAMAK DEVICES