Variation in particle pumping due to changes in topology in high performance DIII-D plasmas

Recent experiments on DIII-D point to the importance of two factors in determining the rate at which deuterium particles can be pumped at the divertor target(s): (1) the divertor magnetic balance, i.e., the degree to which the divertor topology is single-null (SN) or double-null (DN), and (2) the di...

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Bibliographic Details
Published in:Journal of nuclear materials 2005-03, Vol.337-339, p.216-220
Main Authors: Petrie, T.W., Brooks, N.H., Fenstermacher, M.E., Greenfield, C.M., Groth, M., Hyatt, A.W., Leonard, A.W., Mahdavi, M.A., Porter, G.D., Rensink, M.E., Schaffer, M.J., Wade, M.R., Watkins, J.G., Wolf, N.S., The DIII–D Team
Format: Article
Language:English
Subjects:
Divertor asymmetry
Divertor pumping
Magnetic topology
Particle drifts
Recycling
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Summary:Recent experiments on DIII-D point to the importance of two factors in determining the rate at which deuterium particles can be pumped at the divertor target(s): (1) the divertor magnetic balance, i.e., the degree to which the divertor topology is single-null (SN) or double-null (DN), and (2) the direction of the of B×∇B ion drift with respect to the X-point(s). Changes in divertor magnetic balance near the DN shape have a much stronger effect on the pumping rate at the inner divertor target(s) than on the pumping rate at the outer divertor target(s). The behavior in the particle pumping observed at the inner and outer divertor target(s) in the DN and near-DN shapes suggests a redistribution of particles that would be expected in the presence of B×∇B and E×B ion particle drifts in the scrapeoff layer (SOL) and divertor(s).
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2004.10.063