Observations of centrally peaked impurity profiles following pellet injection in the Alcator-C-italic tokamak
Journal Article
·
· Phys. Rev. Lett.; (United States)
Highly peaked carbon and molybdenum profiles occured after hydrogen pellet injection. 40 ms after injection, carbon was well fit by (T-italic/sub e-italic//T/sub e/(0))/sup =/ for r-italicapprox. <6.5 cm (Z-italic/sub C-italic/ = 6). Experimental values of the inward convective velocity and diffusivity were --10/sup 3/(r/a) cm/s and --300 cm/sup 2//s, respectively, which are of the order of neoclassical predictions. An internal disruption then occurred, which reduced on-axis impurities by (2/3) and ended neoclassical-like transport. Carbon is also found to affect sawtooth dynamics dramatically by altering the central resistivity. The implications of these observations to ignited plasmas are discussed.
- Research Organization:
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
- OSTI ID:
- 5442502
- Journal Information:
- Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 57:6; ISSN PRLTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700201* -- Fusion Power Plant Technology-- Blanket Engineering
ABUNDANCE
ALCATOR DEVICE
CARBON
CLOSED PLASMA DEVICES
CONVECTION
DATA
ELEMENTS
ENERGY TRANSFER
EXPERIMENTAL DATA
HEAT TRANSFER
HYDROGEN
IMPURITIES
INFORMATION
MASS TRANSFER
METALS
MOLYBDENUM
NONMETALS
NUMERICAL DATA
PELLET INJECTION
PLASMA
PLASMA DIAGNOSTICS
PLASMA DISRUPTION
SPECTRA
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TRANSITION ELEMENTS
X-RAY SPECTRA
700201* -- Fusion Power Plant Technology-- Blanket Engineering
ABUNDANCE
ALCATOR DEVICE
CARBON
CLOSED PLASMA DEVICES
CONVECTION
DATA
ELEMENTS
ENERGY TRANSFER
EXPERIMENTAL DATA
HEAT TRANSFER
HYDROGEN
IMPURITIES
INFORMATION
MASS TRANSFER
METALS
MOLYBDENUM
NONMETALS
NUMERICAL DATA
PELLET INJECTION
PLASMA
PLASMA DIAGNOSTICS
PLASMA DISRUPTION
SPECTRA
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TRANSITION ELEMENTS
X-RAY SPECTRA