VUV/XUV measurements of impurity emission in plasmas with liquid lithium surfaces on LTX [VUV/XUV measurements of low recycling 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. In conclusion, these new measurements help elucidate the somewhat contradictory results of the effects of solid and liquid lithium on plasma confinement observed in previous experiments.
- Authors:
-
- Johns Hopkins Univ., Baltimore, MD (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- UCLA, Los Angeles, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1399761
- Report Number(s):
- LLNL-JRNL-664883
Journal ID: ISSN 0741-3335
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Plasma Physics and Controlled Fusion
- Additional Journal Information:
- Journal Volume: 56; Journal Issue: 12; Journal ID: ISSN 0741-3335
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION; 36 MATERIALS SCIENCE; XUV; lithium; tokamak; spectroscopy
Citation Formats
Tritz, Kevin, Bell, Ronald E., Beiersdorfer, Peter, Boyle, Dennis, Clementson, Joel, Finkenthal, Michael, Kaita, Robert, Kozub, Tom, Kubota, Shigeyuki, Lucia, Matthew, Majeski, Richard, Merino, Enrique, Schmitt, John, and Stutman, Dan. VUV/XUV measurements of impurity emission in plasmas with liquid lithium surfaces on LTX [VUV/XUV measurements of low recycling plasmas with liquid lithium surfaces on LTX]. United States: N. p., 2014.
Web. doi:10.1088/0741-3335/56/12/125014.
Tritz, Kevin, Bell, Ronald E., Beiersdorfer, Peter, Boyle, Dennis, Clementson, Joel, Finkenthal, Michael, Kaita, Robert, Kozub, Tom, Kubota, Shigeyuki, Lucia, Matthew, Majeski, Richard, Merino, Enrique, Schmitt, John, & Stutman, Dan. VUV/XUV measurements of impurity emission in plasmas with liquid lithium surfaces on LTX [VUV/XUV measurements of low recycling plasmas with liquid lithium surfaces on LTX]. United States. https://doi.org/10.1088/0741-3335/56/12/125014
Tritz, Kevin, Bell, Ronald E., Beiersdorfer, Peter, Boyle, Dennis, Clementson, Joel, Finkenthal, Michael, Kaita, Robert, Kozub, Tom, Kubota, Shigeyuki, Lucia, Matthew, Majeski, Richard, Merino, Enrique, Schmitt, John, and Stutman, Dan. Wed .
"VUV/XUV measurements of impurity emission in plasmas with liquid lithium surfaces on LTX [VUV/XUV measurements of low recycling plasmas with liquid lithium surfaces on LTX]". United States. https://doi.org/10.1088/0741-3335/56/12/125014. https://www.osti.gov/servlets/purl/1399761.
@article{osti_1399761,
title = {VUV/XUV measurements of impurity emission in plasmas with liquid lithium surfaces on LTX [VUV/XUV measurements of low recycling plasmas with liquid lithium surfaces on LTX]},
author = {Tritz, Kevin and Bell, Ronald E. and Beiersdorfer, Peter and Boyle, Dennis and Clementson, Joel and Finkenthal, Michael and Kaita, Robert and Kozub, Tom and Kubota, Shigeyuki and Lucia, Matthew and Majeski, Richard and Merino, Enrique and Schmitt, John and Stutman, Dan},
abstractNote = {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. In conclusion, these new measurements help elucidate the somewhat contradictory results of the effects of solid and liquid lithium on plasma confinement observed in previous experiments.},
doi = {10.1088/0741-3335/56/12/125014},
journal = {Plasma Physics and Controlled Fusion},
number = 12,
volume = 56,
place = {United States},
year = {Wed Nov 12 00:00:00 EST 2014},
month = {Wed Nov 12 00:00:00 EST 2014}
}
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