Journal
NUCLEAR FUSION
Volume 52, Issue 1, Pages -Publisher
INT ATOMIC ENERGY AGENCY
DOI: 10.1088/0029-5515/52/1/013010
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Funding
- US Department of Energy [DE-FC02-04ER54698, DE-FG02-07ER54917]
- U.S. Department of Energy (DOE) [DE-FG02-07ER54917] Funding Source: U.S. Department of Energy (DOE)
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Recent Mach probe measurements of the bulk ion toroidal velocity near the last closed flux surface in DIII-D (Muller et al 2011 Phys. Rev. Lett. 106 115001) are consistent with the existence of a loss-cone distribution in velocity space, as described previously (deGrassie et al 2009 Nucl. Fusion 49 085020), predicting a co-I-p directed velocity localized to the edge. The former model has been extended into the scrape-off layer and takes into account limiting surfaces, and is also extended to include the effect of a uniform radial electric field with magnitude and sign relevant for measurements in the edge of DIII-D H-mode conditions. These added effects modify the details but do not wash out the basic model-computed velocity profile.
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