Measurement and modeling of surface temperature dynamics of the NSTX liquid lithium divertor

A. G. McLean; K. F. Gan; J. W. Ahn; T. K. Gray; R. Maingi; T. Abrams; M. A. Jaworski; R. Kaita; H. W. Kugel; R. E. Nygren; C. H. Skinner; V. A. Soukhanovskii

doi:10.1016/j.jnucmat.2013.01.079

Measurement and modeling of surface temperature dynamics of the NSTX liquid lithium divertor

A. G. McLean, K. F. Gan, J. W. Ahn, T. K. Gray, R. Maingi, T. Abrams, M. A. Jaworski, R. Kaita, H. W. Kugel, R. E. Nygren, C. H. Skinner, V. A. Soukhanovskii

Power Exhaust and Particle Control

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

3 Scopus citations

Abstract

Dual-band infrared (IR) measurements of the National Spherical Torus eXperiment (NSTX) Liquid Lithium Divertor (LLD) are reported that demonstrate liquid Li is more effective at removing plasma heat flux than Li-conditioned graphite. Extended dwell of the outer strike point (OSP) on the LLD caused an incrementally larger area to be heated above the Li melting point through the discharge leading to enhanced D retention and plasma confinement. Measurement of T_surf_ace near the OSP demonstrates a significant reduction of the LLD surface temperature compared to that of Li-coated graphite at the same major radius. Modeling of these data with a 2-D simulation of the LLD structure in the DFLUX code suggests that the structure of the LLD was successful at handling up to q_⊥,peak = 5 MW/m² inter-ELM and up to 10 MW/m² during ELMs from its plasma-facing surface as intended, and provide an innovative method for inferring the Li layer thickness.

Original language	English
Pages (from-to)	S397-S400
Journal	Journal of Nuclear Materials
Volume	438
Issue number	SUPPL
DOIs	https://doi.org/10.1016/j.jnucmat.2013.01.079
State	Published - 2013

Funding

This work was supported by the US Department of Energy, Contract numbers DE-AC05-000R22725, DE-AC52-07NA27344, and DE-AC02-09CH11466.

Funders	Funder number
U.S. Department of Energy	DE-AC05-000R22725, DE-AC02-09CH11466, DE-AC52-07NA27344

UN SDGs

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

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McLean, A. G., Gan, K. F., Ahn, J. W., Gray, T. K., Maingi, R., Abrams, T., Jaworski, M. A., Kaita, R., Kugel, H. W., Nygren, R. E., Skinner, C. H., & Soukhanovskii, V. A. (2013). Measurement and modeling of surface temperature dynamics of the NSTX liquid lithium divertor. Journal of Nuclear Materials, 438(SUPPL), S397-S400. https://doi.org/10.1016/j.jnucmat.2013.01.079

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title = "Measurement and modeling of surface temperature dynamics of the NSTX liquid lithium divertor",

abstract = "Dual-band infrared (IR) measurements of the National Spherical Torus eXperiment (NSTX) Liquid Lithium Divertor (LLD) are reported that demonstrate liquid Li is more effective at removing plasma heat flux than Li-conditioned graphite. Extended dwell of the outer strike point (OSP) on the LLD caused an incrementally larger area to be heated above the Li melting point through the discharge leading to enhanced D retention and plasma confinement. Measurement of Tsurface near the OSP demonstrates a significant reduction of the LLD surface temperature compared to that of Li-coated graphite at the same major radius. Modeling of these data with a 2-D simulation of the LLD structure in the DFLUX code suggests that the structure of the LLD was successful at handling up to q⊥,peak = 5 MW/m2 inter-ELM and up to 10 MW/m2 during ELMs from its plasma-facing surface as intended, and provide an innovative method for inferring the Li layer thickness.",

author = "McLean, {A. G.} and Gan, {K. F.} and Ahn, {J. W.} and Gray, {T. K.} and R. Maingi and T. Abrams and Jaworski, {M. A.} and R. Kaita and Kugel, {H. W.} and Nygren, {R. E.} and Skinner, {C. H.} and Soukhanovskii, {V. A.}",

year = "2013",

doi = "10.1016/j.jnucmat.2013.01.079",

language = "English",

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AU - McLean, A. G.

AU - Gan, K. F.

AU - Ahn, J. W.

AU - Gray, T. K.

AU - Maingi, R.

AU - Abrams, T.

AU - Jaworski, M. A.

AU - Kaita, R.

AU - Kugel, H. W.

AU - Nygren, R. E.

AU - Skinner, C. H.

AU - Soukhanovskii, V. A.

PY - 2013

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N2 - Dual-band infrared (IR) measurements of the National Spherical Torus eXperiment (NSTX) Liquid Lithium Divertor (LLD) are reported that demonstrate liquid Li is more effective at removing plasma heat flux than Li-conditioned graphite. Extended dwell of the outer strike point (OSP) on the LLD caused an incrementally larger area to be heated above the Li melting point through the discharge leading to enhanced D retention and plasma confinement. Measurement of Tsurface near the OSP demonstrates a significant reduction of the LLD surface temperature compared to that of Li-coated graphite at the same major radius. Modeling of these data with a 2-D simulation of the LLD structure in the DFLUX code suggests that the structure of the LLD was successful at handling up to q⊥,peak = 5 MW/m2 inter-ELM and up to 10 MW/m2 during ELMs from its plasma-facing surface as intended, and provide an innovative method for inferring the Li layer thickness.

AB - Dual-band infrared (IR) measurements of the National Spherical Torus eXperiment (NSTX) Liquid Lithium Divertor (LLD) are reported that demonstrate liquid Li is more effective at removing plasma heat flux than Li-conditioned graphite. Extended dwell of the outer strike point (OSP) on the LLD caused an incrementally larger area to be heated above the Li melting point through the discharge leading to enhanced D retention and plasma confinement. Measurement of Tsurface near the OSP demonstrates a significant reduction of the LLD surface temperature compared to that of Li-coated graphite at the same major radius. Modeling of these data with a 2-D simulation of the LLD structure in the DFLUX code suggests that the structure of the LLD was successful at handling up to q⊥,peak = 5 MW/m2 inter-ELM and up to 10 MW/m2 during ELMs from its plasma-facing surface as intended, and provide an innovative method for inferring the Li layer thickness.

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VL - 438

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JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

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ER -

Measurement and modeling of surface temperature dynamics of the NSTX liquid lithium divertor

Abstract

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UN SDGs

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