[ital q]-profile measurements in the Tokamak Fusion Test Reactor
- Fusion Physics Technology, Inc., 3547 Voyager Street, Torrance, California 90503 (United States)
- 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), Vol. 5:7; ISSN 0899-8221
- Country of Publication:
- United States
- Language:
- English
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Equilibrium reconstruction of the q-profile in tokamaks from motional Stark effect data
Equilibrium reconstruction of the q-profile in tokamaks from motional Stark effect data
Related Subjects
TOKAMAK DEVICES
BEAM INJECTION HEATING
CURRENTS
CALIBRATION
HIGH-BETA PLASMA
MEASURING METHODS
MHD EQUILIBRIUM
NEUTRAL ATOM BEAM INJECTION
STARK EFFECT
BEAM INJECTION
CLOSED PLASMA DEVICES
EQUILIBRIUM
HEATING
PLASMA
PLASMA HEATING
THERMONUCLEAR DEVICES
700340* - Plasma Waves
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700310 - Plasma Confinement- (1992-)