Measurements and 2-D modeling of recycling and edge transport in discharges with lithium-coated PFCs in NSTX
Abstract
We report the application of lithium coatings on plasma facing components has been shown to profoundly affect plasma performance in the National Spherical Torus Experiment, improving energy confinement and eliminating edge-localized modes. The edge particle balance during these ELM-free discharges has been studied through 2-D plasma-neutrals modeling, constrained by measurements of the upstream plasma density and temperature profiles and the divertor heat flux and $$\mathcal{D}_α$$ emission. The calculations indicate that the reduction in divertor $$\mathcal{D}_α$$ emission with lithium coatings applied is consistent with a drop in recycling coefficient from $$\mathcal{R}$$ ~ 0.98 to $$\mathcal{R}$$ ~ 0.9. The change in recycling is not sufficient to account for the change in edge density profiles: interpretive modeling indicates similar transport coefficients within the edge transport barrier ($$D/χ_e$$ ~ 0.2/1.0 m2/s), but a widening of the barrier with lithium.
- Authors:
-
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- General Atomics, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1898299
- Report Number(s):
- LLNL-JRNL-434280
Journal ID: ISSN 0022-3115; 402094; TRN: US2310875
- Grant/Contract Number:
- AC52-07NA27344; AC05-00OR22725; AC02-09CH11466; FC02-04ER54698
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Nuclear Materials
- Additional Journal Information:
- Journal Volume: 415; Journal Issue: 1; Journal ID: ISSN 0022-3115
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; plasma-materials interaction; plasma properties; lithium; cross-field transport; edge molding; NSTX
Citation Formats
Canik, J. M., Maingi, R., Soukhanovskii, V. A., Bell, R. E., Kugel, H. W., LeBlanc, B. P., and Osborne, T. H. Measurements and 2-D modeling of recycling and edge transport in discharges with lithium-coated PFCs in NSTX. United States: N. p., 2010.
Web. doi:10.1016/j.jnucmat.2010.11.084.
Canik, J. M., Maingi, R., Soukhanovskii, V. A., Bell, R. E., Kugel, H. W., LeBlanc, B. P., & Osborne, T. H. Measurements and 2-D modeling of recycling and edge transport in discharges with lithium-coated PFCs in NSTX. United States. https://doi.org/10.1016/j.jnucmat.2010.11.084
Canik, J. M., Maingi, R., Soukhanovskii, V. A., Bell, R. E., Kugel, H. W., LeBlanc, B. P., and Osborne, T. H. Thu .
"Measurements and 2-D modeling of recycling and edge transport in discharges with lithium-coated PFCs in NSTX". United States. https://doi.org/10.1016/j.jnucmat.2010.11.084. https://www.osti.gov/servlets/purl/1898299.
@article{osti_1898299,
title = {Measurements and 2-D modeling of recycling and edge transport in discharges with lithium-coated PFCs in NSTX},
author = {Canik, J. M. and Maingi, R. and Soukhanovskii, V. A. and Bell, R. E. and Kugel, H. W. and LeBlanc, B. P. and Osborne, T. H.},
abstractNote = {We report the application of lithium coatings on plasma facing components has been shown to profoundly affect plasma performance in the National Spherical Torus Experiment, improving energy confinement and eliminating edge-localized modes. The edge particle balance during these ELM-free discharges has been studied through 2-D plasma-neutrals modeling, constrained by measurements of the upstream plasma density and temperature profiles and the divertor heat flux and $\mathcal{D}_α$ emission. The calculations indicate that the reduction in divertor $\mathcal{D}_α$ emission with lithium coatings applied is consistent with a drop in recycling coefficient from $\mathcal{R}$ ~ 0.98 to $\mathcal{R}$ ~ 0.9. The change in recycling is not sufficient to account for the change in edge density profiles: interpretive modeling indicates similar transport coefficients within the edge transport barrier ($D/χ_e$ ~ 0.2/1.0 m2/s), but a widening of the barrier with lithium.},
doi = {10.1016/j.jnucmat.2010.11.084},
journal = {Journal of Nuclear Materials},
number = 1,
volume = 415,
place = {United States},
year = {Thu Dec 02 00:00:00 EST 2010},
month = {Thu Dec 02 00:00:00 EST 2010}
}
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