Observation of Non-Maxwellian Electron Distributions in th e NSTX Divertor
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 occuring 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
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-ACO2-09CH11466
- OSTI ID:
- 1073493
- Report Number(s):
- PPPL-4854
- Resource Relation:
- Conference: Journal of Nuclear Materials, (June 2012) and 20th Plasma-Surface Intractions Conference, Aachen, Germany, (May 2012)
- Country of Publication:
- United States
- Language:
- English
Similar Records
Local Effects of Biased Electrodes in the Divertor of NSTX
Assessment of equilibrium field coil misalignments on the divertor footprints in NSTX-U