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Title: Effect of progressively increasing lithium conditioning on edge transport and stability in high triangularity NSTX H-modes
Contributors: Maingi, R.
Canik, J.M.
Bell, R.E.
Boyle, D.P.
Diallo, A.
Kaita, R.
Kaye, S.M.
LeBlanc, B.P.
Sabbagh, S.A.
Scotti, F.
Soukhanovskii, V.A.
U. S. Department of Energy contract number DE-AC02-09CH11466
Keywords: NSTX
Energy confinement
Issue Date: Aug-2016
Publisher: Princeton Plasma Physics Laboratory, Princeton University
Related Publication: Fusion Engineering and Design
Abstract: A sequence of H-mode discharges with increasing levels of pre-discharge lithium evaporation (�dose�) was conducted in high triangularity and elongation boundary shape in NSTX. Energy confinement increased, and recycling decreased with increasing lithium dose, similar to a previous lithium dose scan in medium triangularity and elongation plasmas. Data-constrained SOLPS interpretive modeling quantified the edge transport change: the electron particle diffusivity decreased by 10-30x. The electron thermal diffusivity decreased by 4x just inside the top of the pedestal, but increased by up to 5x very near the separatrix. These results provide a baseline expectation for lithium benefits in NSTX-U, which is optimized for a boundary shape similar to the one in this experiment.
Appears in Collections:NSTX

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