Experimental and Numerical Studies of Separatrix Splitting and Magnetic Footprints in DIII-D

A numerical field line integration code is used to study the structure of divertor footprints produced by small non-axisymmetric magnetic perturbation in the DIII-D tokamak. The numerical modeling results are compared to experimental infrared camera data which show a splitting of the divertor target...

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Bibliographic Details
Published in:Journal of nuclear materials 2006-05, Vol.363-365
Main Authors: Evans, T, Joseph, I, Moyer, R, Fenstermacher, M, Lasnier, C, Yan, L
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION
AMPLIFICATION
CAMERAS
DESIGN
DIVERTORS
DOUBLET-3 DEVICE
GENERAL AND MISCELLANEOUS
HEAT FLUX
PLASMA
PLATES
SIMULATION
TARGETS
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Summary:A numerical field line integration code is used to study the structure of divertor footprints produced by small non-axisymmetric magnetic perturbation in the DIII-D tokamak. The numerical modeling results are compared to experimental infrared camera data which show a splitting of the divertor target plate heat flux into several distinct peaks when an n=3 magnetic perturbation from the DIII-D I-coil is applied. The heat flux splitting consistently appears when the n=3 perturbation is applied and disappears when the perturbation is removed. The magnitude of the splitting implied by the numerical modeling is a factor of 3 smaller than the splitting seen in the experimental data. These results suggest that the plasma response to the edge resonant applied n=3 magnetic perturbation produces an amplification of the vacuum magnetic footprint structure on the divertor target plates. These results may have significant implications for the ITER divertor design.
ISSN:0022-3115
1873-4820