Sawtooth studies with [ital q]-profile measurements on TFTR (abstract)

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1146414· OSTI ID:6690422

Levinton, F M; Batha, S H ^[1]; Yamada, M; Zakharov, L; Zarnstorff, M C ^[2]

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1. Fusion Physics and Technology, 3547 Voyager Street, Torrance, California 90503 (United States)
2. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)

The [ital q] profile plays a key role for plasma equilibrium and theories of MHD instabilities. With the development of the motional Stark effect (MSE) diagnostic,[sup b] accurate [ital q]([ital r],[ital t]) profiles have been measured and utilized for equilibrium and stability analysis. Data have been obtained for several conditions on TFTR including [ital L] mode, supershot, current ramps, noninductive current drive, and high [beta][sub [ital p]]. Sawtoothing discharges on TFTR have [ital q](0) well below one, and it remains below one throughout the evolution of the sawtooth cycle. This is in contradiction with the widely believed Kadomtsev model. It has also been found that stabilization of sawteeth can be achieved with [ital q](0)[lt]1. The criteria for stabilization have been compared to several theoretical models such as resistive, ideal, and two-fluid MHD. The [omega]* stabilization from the two-fluid MHD model agrees well with the data from TFTR.

• DOE Contract Number: AC02-76CH03073
• OSTI ID: 6690422
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 66:1; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700320* -- Plasma Diagnostic Techniques & Instrumentation-- (1992-)
CLOSED PLASMA DEVICES
CURRENT-DRIVE HEATING
ELECTRIC HEATING
FLUID MECHANICS
HEATING
HYDRODYNAMICS
INSTABILITY
JOULE HEATING
MAGNETOHYDRODYNAMICS
MECHANICS
OSCILLATIONS
PLASMA DIAGNOSTICS
PLASMA HEATING
PLASMA INSTABILITY
PLASMA RADIAL PROFILES
RESISTANCE HEATING
SAWTOOTH OSCILLATIONS
STARK EFFECT
TFTR TOKAMAK
THERMONUCLEAR DEVICES
TOKAMAK DEVICES