VUV/XUV measurements of impurity emission in plasmas with liquid lithium surfaces on LTX

Kevin Tritz; Ronald E. Bell; Peter Beiersdorfer; Dennis Boyle; Joel Clementson; Michael Finkenthal; Robert Kaita; Tom Kozub; Shigeyuki Kubota; Matthew Lucia; Richard Majeski; Enrique Merino; John Schmitt; Dan Stutman

doi:10.1088/0741-3335/56/12/125014

VUV/XUV measurements of impurity emission in plasmas with liquid lithium surfaces on LTX

Kevin Tritz^*, Ronald E. Bell, Peter Beiersdorfer, Dennis Boyle, Joel Clementson, Michael Finkenthal, Robert Kaita, Tom Kozub, Shigeyuki Kubota, Matthew Lucia, Richard Majeski, Enrique Merino, John Schmitt, Dan Stutman

^*Corresponding author for this work

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

6 Scopus citations

Abstract

The VUV/XUV spectrum has been measured on the Lithium Tokamak eXperiment (LTX) using a transmission grating imaging spectrometer (TGIS) coupled to a direct-detection x-ray charge-coupled device camera. TGIS data show significant changes in the ratios between the lithium and oxygen impurity line emission during discharges with varying lithium wall conditions. Lithium coatings that have been passivated by lengthy exposure to significant levels of impurities contribute to a large O/Li ratio measured during LTX plasma discharges. Furthermore, previous results have indicated that a passivated lithium film on the plasma facing components will function as a stronger impurity source when in the form of a hot liquid layer compared to a solid lithium layer. However, recent TGIS measurements of plasma discharges in LTX with hot stainless steel boundary shells and a fresh liquid lithium coating show lower O/Li impurity line ratios when compared to discharges with a solid lithium film on cool shells. These new measurements help elucidate the somewhat contradictory results of the effects of solid and liquid lithium on plasma confinement observed in previous experiments.

Original language	English
Article number	125014
Journal	Plasma Physics and Controlled Fusion
Volume	56
Issue number	12
DOIs	https://doi.org/10.1088/0741-3335/56/12/125014
State	Published - 1 Dec 2014
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2014 IOP Publishing Ltd.

Keywords

Lithium
Spectroscopy
Tokamak
XUV

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10.1088/0741-3335/56/12/125014

Cite this

Tritz, K., Bell, R. E., Beiersdorfer, P., Boyle, D., Clementson, J., Finkenthal, M., Kaita, R., Kozub, T., Kubota, S., Lucia, M., Majeski, R., Merino, E., Schmitt, J., & Stutman, D. (2014). VUV/XUV measurements of impurity emission in plasmas with liquid lithium surfaces on LTX. Plasma Physics and Controlled Fusion, 56(12), Article 125014. https://doi.org/10.1088/0741-3335/56/12/125014

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title = "VUV/XUV measurements of impurity emission in plasmas with liquid lithium surfaces on LTX",

abstract = "The VUV/XUV spectrum has been measured on the Lithium Tokamak eXperiment (LTX) using a transmission grating imaging spectrometer (TGIS) coupled to a direct-detection x-ray charge-coupled device camera. TGIS data show significant changes in the ratios between the lithium and oxygen impurity line emission during discharges with varying lithium wall conditions. Lithium coatings that have been passivated by lengthy exposure to significant levels of impurities contribute to a large O/Li ratio measured during LTX plasma discharges. Furthermore, previous results have indicated that a passivated lithium film on the plasma facing components will function as a stronger impurity source when in the form of a hot liquid layer compared to a solid lithium layer. However, recent TGIS measurements of plasma discharges in LTX with hot stainless steel boundary shells and a fresh liquid lithium coating show lower O/Li impurity line ratios when compared to discharges with a solid lithium film on cool shells. These new measurements help elucidate the somewhat contradictory results of the effects of solid and liquid lithium on plasma confinement observed in previous experiments.",

keywords = "Lithium, Spectroscopy, Tokamak, XUV",

author = "Kevin Tritz and Bell, {Ronald E.} and Peter Beiersdorfer and Dennis Boyle and Joel Clementson and Michael Finkenthal and Robert Kaita and Tom Kozub and Shigeyuki Kubota and Matthew Lucia and Richard Majeski and Enrique Merino and John Schmitt and Dan Stutman",

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Tritz, K, Bell, RE, Beiersdorfer, P, Boyle, D, Clementson, J, Finkenthal, M, Kaita, R, Kozub, T, Kubota, S, Lucia, M, Majeski, R, Merino, E, Schmitt, J & Stutman, D 2014, 'VUV/XUV measurements of impurity emission in plasmas with liquid lithium surfaces on LTX', Plasma Physics and Controlled Fusion, vol. 56, no. 12, 125014. https://doi.org/10.1088/0741-3335/56/12/125014

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AU - Tritz, Kevin

AU - Bell, Ronald E.

AU - Beiersdorfer, Peter

AU - Boyle, Dennis

AU - Clementson, Joel

AU - Finkenthal, Michael

AU - Kaita, Robert

AU - Kozub, Tom

AU - Kubota, Shigeyuki

AU - Lucia, Matthew

AU - Majeski, Richard

AU - Merino, Enrique

AU - Schmitt, John

AU - Stutman, Dan

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N2 - The VUV/XUV spectrum has been measured on the Lithium Tokamak eXperiment (LTX) using a transmission grating imaging spectrometer (TGIS) coupled to a direct-detection x-ray charge-coupled device camera. TGIS data show significant changes in the ratios between the lithium and oxygen impurity line emission during discharges with varying lithium wall conditions. Lithium coatings that have been passivated by lengthy exposure to significant levels of impurities contribute to a large O/Li ratio measured during LTX plasma discharges. Furthermore, previous results have indicated that a passivated lithium film on the plasma facing components will function as a stronger impurity source when in the form of a hot liquid layer compared to a solid lithium layer. However, recent TGIS measurements of plasma discharges in LTX with hot stainless steel boundary shells and a fresh liquid lithium coating show lower O/Li impurity line ratios when compared to discharges with a solid lithium film on cool shells. These new measurements help elucidate the somewhat contradictory results of the effects of solid and liquid lithium on plasma confinement observed in previous experiments.

AB - The VUV/XUV spectrum has been measured on the Lithium Tokamak eXperiment (LTX) using a transmission grating imaging spectrometer (TGIS) coupled to a direct-detection x-ray charge-coupled device camera. TGIS data show significant changes in the ratios between the lithium and oxygen impurity line emission during discharges with varying lithium wall conditions. Lithium coatings that have been passivated by lengthy exposure to significant levels of impurities contribute to a large O/Li ratio measured during LTX plasma discharges. Furthermore, previous results have indicated that a passivated lithium film on the plasma facing components will function as a stronger impurity source when in the form of a hot liquid layer compared to a solid lithium layer. However, recent TGIS measurements of plasma discharges in LTX with hot stainless steel boundary shells and a fresh liquid lithium coating show lower O/Li impurity line ratios when compared to discharges with a solid lithium film on cool shells. These new measurements help elucidate the somewhat contradictory results of the effects of solid and liquid lithium on plasma confinement observed in previous experiments.

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VUV/XUV measurements of impurity emission in plasmas with liquid lithium surfaces on LTX

Abstract

Bibliographical note

Keywords

UN SDGs

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