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 direction of the of B x {del}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 x {del}B and E x B ion particle drifts in the scrapeoff layer (SOL) and divertor(s).
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 15011792
- Report Number(s):
- UCRL-CONF-208421; TRN: US0501443
- Resource Relation:
- Journal Volume: 337-339; Conference: Presented at: 16th International Conference on Plasma Surface Interactions, Portland, ME (US), 05/24/2004--05/28/2004; Other Information: PBD: 3 Dec 2004
- Country of Publication:
- United States
- Language:
- English
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