Abstract
The scrape-off layer plasma at the tokamak region is characterized by open field lines and often contains large variations in plasma properties along these field-lines. Proper characterization of local plasma conditions is critical to assessing plasma-material interaction processes occurring at the target. Langmuir probes are frequently employed in tokamak divertors but are challenging to interpretation. A kinetic interpretation for Langmuir probes in NSTX has yielded non-Maxwellian electron distributions in the divertor characterized by cool bulk populations and energetic tail populations with temperatures of 2-4 times the bulk. Spectroscopic analysis and modeling confirms the bulk plasma temperature and density which can only be obtained with the kinetic interpretation.
Original language | English |
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Pages (from-to) | S384-S387 |
Journal | Journal of Nuclear Materials |
Volume | 438 |
Issue number | SUPPL |
DOIs | |
State | Published - 2013 |
Funding
The authors thank the reviewers for comments that have generally improve the quality of this manuscript. This work is supported under the U.S. Department of Energy contract #DE-AC02-09CHI1466.