[ital q]-profile measurements in the Tokamak Fusion Test Reactor

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860743· OSTI ID:6423372

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

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

The [ital q]-profile plays a key role in determining plasma equilibrium and stability in tokamaks. With the development of the motional Stark effect (MSE) diagnostic, accurate [ital q]([ital R],[ital t]) profiles have been measured and utilized for equilibrium and stability analysis. A multichannel MSE polarimeter system on the Tokamak Fusion Test Reactor (TFTR) [Plasma Phys. Controlled Fusion [bold 33], 1509 (1991)] has obtained data for several plasma conditions including L-mode, supershot, current ramps, and high [beta][sub [ital p]]. For sawtoothing discharges on TFTR, it is found that [ital q](0)[similar to]0.7, well below one, and remains below one throughout the entire evolution of the sawtooth cycle with an increase in [ital q](0) of [le]0.1 after a sawtooth crash. During high [beta][sub [ital p]] operation or coinjection of neutral beams on TFTR a significant broadening of the current profile and an increase of [ital q](0) is observed.

• DOE Contract Number: AC02-76CH03073
• OSTI ID: 6423372
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 5:7; ISSN 0899-8221; ISSN PFBPEI
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700310 -- Plasma Confinement-- (1992-)
700340* -- Plasma Waves
Oscillations
& Instabilities-- (1992-)
BEAM INJECTION
BEAM INJECTION HEATING
CALIBRATION
CLOSED PLASMA DEVICES
CURRENTS
EQUILIBRIUM
HEATING
HIGH-BETA PLASMA
MEASURING METHODS
MHD EQUILIBRIUM
NEUTRAL ATOM BEAM INJECTION
PLASMA
PLASMA HEATING
STARK EFFECT
THERMONUCLEAR DEVICES
TOKAMAK DEVICES