Dependence of recycling and edge profiles on lithium evaporation in high triangularity, high performance NSTX H-mode discharges

Maingi, Rajesh; Osborne, T. H.; Bell, M. G.; Bell, R. E.; Boyle, D. P.; Canik, John M.; Diallo, A.; Kaita, R.; Kaye, S. M.; Kugel, H. W.; LeBlanc, B. P.; Sabbagh, S. A.; Skinner, C. H.; Soukhanovskii, V. A.

doi:10.1016/j.jnucmat.2014.10.084

Title: Dependence of recycling and edge profiles on lithium evaporation in high triangularity, high performance NSTX H-mode discharges

Journal Article · Tue Nov 04 00:00:00 EST 2014 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2014.10.084· OSTI ID:1341539

Maingi, Rajesh ^[1]; Osborne, T. H. ^[2]; Bell, M. G. ^[1]; Bell, R. E. ^[1]; Boyle, D. P. ^[1]; Canik, John M. ^[3]; Diallo, A. ^[1]; Kaita, R. ^[1]; Kaye, S. M. ^[1]; Kugel, H. W. ^[1]; LeBlanc, B. P. ^[1]; Sabbagh, S. A. ^[4]; Skinner, C. H. ^[1]; Soukhanovskii, V. A. ^[5]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
General Atomics, San Diego, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Columbia Univ., New York, NY (United States). Applied Physics and Applied Math Dept.
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

In this paper, the effects of a pre-discharge lithium evaporation variation on highly shaped discharges in the National Spherical Torus Experiment (NSTX) are documented. Lithium wall conditioning ('dose') was routinely applied onto graphite plasma facing components between discharges in NSTX, partly to reduce recycling. Reduced D-alpha, emission from the lower and upper divertor and center stack was observed, as well as reduced midplane neutral pressure; the magnitude of reduction increased with the pre-discharge lithium dose. Improved energy confinement, both raw tau(E) and H-factor normalized to scalings, with increasing lithium dose was also observed. At the highest doses, we also observed elimination of edge-localized modes. The midplane edge plasma profiles were dramatically altered, comparable to lithium dose scans at lower shaping, where the strike point was farther from the lithium deposition centroid. This indicates that the benefits of lithium conditioning should apply to the highly shaped plasmas planned in NSTX-U. (C) 2014 Elsevier B.V. All rights reserved.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Lawrence Livermore National Lab., Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; AC02-09CH11466; FC02-04ER54698; FC02-99ER54512; AC52-07NA27344

OSTI ID:: 1341539

Alternate ID(s):: OSTI ID: 1260716; OSTI ID: 1281680

Report Number(s):: LLNL-JRNL-696263; AT1030100; ERAT021

Journal Information:: Journal of Nuclear Materials, Vol. 463, Issue C; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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Gyrokinetic neoclassical study of the bootstrap current in the tokamak edge pedestal with fully non-linear Coulomb collisions Hager, Robert; Chang, C. S. Physics of Plasmas, Vol. 23, Issue 4 https://doi.org/10.1063/1.4945615	journal	April 2016
Scenario development during commissioning operations on the National Spherical Torus Experiment Upgrade Battaglia, D. J.; Boyer, M. D.; Gerhardt, S. Nuclear Fusion, Vol. 58, Issue 4 https://doi.org/10.1088/1741-4326/aaa6e0	journal	February 2018
Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry Coury, M.; Guttenfelder, W.; Mikkelsen, D. R. Physics of Plasmas, Vol. 23, Issue 6 https://doi.org/10.1063/1.4954911	journal	June 2016

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