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

R. Maingi; J. M. Canik; R. E. Bell; D. P. Boyle; A. Diallo; R. Kaita; S. M. Kaye; B. P. LeBlanc; S. A. Sabbagh; F. Scotti; V. A. Soukhanovskii

doi:10.1016/j.fusengdes.2016.06.058

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

R. Maingi, J. M. Canik, R. E. Bell, D. P. Boyle, A. Diallo, R. Kaita, S. M. Kaye, B. P. LeBlanc, S. A. Sabbagh, F. Scotti, V. A. Soukhanovskii

Fusion Energy Division

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

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.

Original language	English
Pages (from-to)	150-156
Number of pages	7
Journal	Fusion Engineering and Design
Volume	117
DOIs	https://doi.org/10.1016/j.fusengdes.2016.06.058
State	Published - Apr 1 2017

Funding

This research was sponsored in part by U.S. Dept. of Energy under contracts DE-AC02-09CH11466 , DE-AC05-00OR22725 , DE-FC02-04ER54698 , DE-FC02-99ER54512 and DE-AC52-07NA27344 . We greatfully acknowledge the contributions of the NSTX operations staff. The digital data for this paper can be found at: http://arks.princeton.edu/ark:/88435/dsp01h128nh17k .

Funders	Funder number
U.S. Dept. of Energy	DE-AC05-00OR22725, DE-AC02-09CH11466, DE-FC02-04ER54698, DE-AC52-07NA27344, DE-FC02-99ER54512

Keywords

Energy confinement
Lithium
NSTX
Pedestal
Recyling

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.fusengdes.2016.06.058

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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. (2017). Effect of progressively increasing lithium conditioning on edge transport and stability in high triangularity NSTX H-modes. Fusion Engineering and Design, 117, 150-156. https://doi.org/10.1016/j.fusengdes.2016.06.058

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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 ({\textquoteleft}dose{\textquoteright}) 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.",

keywords = "Energy confinement, Lithium, NSTX, Pedestal, Recyling",

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AU - Maingi, R.

AU - Canik, J. M.

AU - Bell, R. E.

AU - Boyle, D. P.

AU - Diallo, A.

AU - Kaita, R.

AU - Kaye, S. M.

AU - LeBlanc, B. P.

AU - Sabbagh, S. A.

AU - Scotti, F.

AU - Soukhanovskii, V. A.

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N2 - 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.

AB - 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.

KW - Energy confinement

KW - Lithium

KW - NSTX

KW - Pedestal

KW - Recyling

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JO - Fusion Engineering and Design

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ER -

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

Abstract

Funding

Keywords

UN SDGs

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