Effect of feedback on a nonlinear kink perturbation in a tokamak

Journal Article · Sat Mar 01 04:00:00 EST 1980 · Sov. J. Plasma Phys. (Engl. Transl.); (United States)

OSTI ID:6691448

Gvozdkov, Y V; Ivanov, N V; Kakurin, A M

Experiments are reported on the effect of a feedback system on the temporal characteristics of the m=2 kink perturbation in the TO-1 tokamak. In the absence of feedback, the perturbation amplitude pulsates in time. At a relatively low gain level, the feedback changes the pulsation period. Over a certain interval of phase angles, an increase in the gain above a certain threshold causes the pulsation to give way to a suppression mode; i.e., the perturbation amplitude falls off substantially. The experimental results agree with the model in which the simple theory for the tearing-mode instability is supplemented with an account of the plasma rotation in the minor azimuthal direction with a constant angular velocity and also with an account of the inertial nonlinearity found phenomenologically.

• Research Organization: I. V. Kurchatov Institute of Atomic Energy, Moscow
• OSTI ID: 6691448
• Journal Information: Sov. J. Plasma Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Plasma Phys. (Engl. Transl.); (United States) Vol. 6:2; ISSN SJPPD
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107* -- Fusion Energy-- Plasma Research-- Instabilities
ANNULAR SPACE
CLOSED PLASMA DEVICES
CONFIGURATION
FEEDBACK
INSTABILITY
KINK INSTABILITY
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
SPACE
STABILIZATION
TEARING INSTABILITY
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TOROIDAL CONFIGURATION