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Title: Effect of progressively increasing lithium conditioning on edge transport and stability in high triangularity NSTX H-modes

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.


Citation Formats

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., and Soukhanovskii, V.A. Effect of progressively increasing lithium conditioning on edge transport and stability in high triangularity NSTX H-modes. United States: N. p., 2016. Web. doi:10.11578/1367163.
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. Effect of progressively increasing lithium conditioning on edge transport and stability in high triangularity NSTX H-modes. United States. doi:10.11578/1367163.
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., and Soukhanovskii, V.A. 2016. "Effect of progressively increasing lithium conditioning on edge transport and stability in high triangularity NSTX H-modes". United States. doi:10.11578/1367163. https://www.osti.gov/servlets/purl/1367163. Pub date:Mon Aug 01 00:00:00 EDT 2016
@article{osti_1367163,
title = {Effect of progressively increasing lithium conditioning on edge transport and stability in high triangularity NSTX H-modes},
author = {Maingi, R. and Canik, J.M. and Bell, R.E. and Boyle, D.P and Diallo, A. and Kaita, R. and Kaye, S.M. and LeBlanc, B.P. and Sabbagh, S.A. and Scotti, F. and Soukhanovskii, V.A.},
abstractNote = {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.},
doi = {10.11578/1367163},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2016},
month = {8}
}

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