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An assessment of ni...
An assessment of nitrogen concentrations from spectroscopic measurements in the JET and ASDEX upgrade divertor
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- Andersson Sundén, Erik (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Bergsåker, Henrik (author)
- KTH,Fusionsplasmafysik
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- Bykov, Igor (author)
- KTH,Fusionsplasmafysik
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- Frassinetti, Lorenzo (author)
- KTH,Fusionsplasmafysik
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- Garcia Carrasco, Alvaro, 1989- (author)
- KTH,Fusionsplasmafysik
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- Hellsten, Torbjörn (author)
- KTH,Fusionsplasmafysik
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- Johnson, Thomas (author)
- KTH,Fusionsplasmafysik
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- Menmuir, Sheena (author)
- KTH,Fusionsplasmafysik
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- Petersson, Per (author)
- KTH,Fusionsplasmafysik
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- Rachlew, Elisabeth (author)
- KTH,Partikel- och astropartikelfysik
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- Ratynskaia, Svetlana (author)
- KTH,Rymd- och plasmafysik
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- Rubel, Marek (author)
- KTH,Fusionsplasmafysik
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- Stefániková, Estera (author)
- KTH,Fusionsplasmafysik
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- Ström, Petter (author)
- KTH,Fusionsplasmafysik
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- Tholerus, Emmi (author)
- KTH,Fusionsplasmafysik
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- Tolias, Panagiotis (author)
- KTH,Rymd- och plasmafysik
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- Olivares, Pablo Vallejos (author)
- KTH,Fusionsplasmafysik
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- Weckmann, Armin (author)
- KTH,Fusionsplasmafysik
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- Zhou, Yushan (author)
- KTH,Fusionsplasmafysik
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- Zychor, I. (author)
- Natl Ctr Nucl Res, PL-05400 Otwock, Poland.
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- Binda, Federico, 1987- (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Cecconello, Marco (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Conroy, Sean (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Dzysiuk, Nataliia (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Ericsson, Göran (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Eriksson, Jacob, Dr, 1985- (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Hellesen, Carl, 1980- (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Hjalmarsson, Anders (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Possnert, Göran, 1951- (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Sjöstrand, Henrik, 1978- (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Skiba, Mateusz, 1985- (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Weiszflog, Matthias (author)
- Uppsala universitet,Tillämpad kärnfysik
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(creator_code:org_t)
- Elsevier, 2019
- 2019
- English.
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In: Nuclear Materials and Energy. - : Elsevier. - 2352-1791. ; 18, s. 147-152
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https://doi.org/10.1...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Subject headings
Close
- The impurity concentration in the tokamak divertor plasma is a necessary input for predictive scaling of divertor detachment, however direct measurements from existing tokamaks in different divertor plasma conditions are limited. To address this, we have applied a recently developed spectroscopic N II line ratio technique for measuring the N concentration in the divertor to a range of H-mode and L-mode plasma from the ASDEX Upgrade and JET tokamaks, respectively. The results from both devices show that as the power crossing the separatrix, P-sep, is increased under otherwise similar core conditions (e.g. density), a higher N concentration is required to achieve the same detachment state. For example, the N concentrations at the start of detachment increase from approximate to 2% to approximate to 9% as P-sep, is increased from approximate to 2.5 MW to approximate to 7 MW. These results tentatively agree with scaling law predictions (e.g. Goldston et al.) motivating a further study examining the parameters which affect the N concentration required to reach detachment. Finally, the N concentrations from spectroscopy and the ratio of D and N gas valve fluxes agree within experimental uncertainty only when the vessel surfaces are fully-loaded with N.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Keyword
- Impurity
- Nitrogen
- Divertor
- Concentration
- Spectroscopy
- Tokamak
Publication and Content Type
- ref (subject category)
- art (subject category)
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Andersson Sundén ...
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Bergsåker, Henri ...
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Bykov, Igor
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Frassinetti, Lor ...
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Garcia Carrasco, ...
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Hellsten, Torbjö ...
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show more...
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Johnson, Thomas
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Menmuir, Sheena
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Petersson, Per
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Rachlew, Elisabe ...
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Ratynskaia, Svet ...
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Rubel, Marek
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Stefániková, Est ...
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Ström, Petter
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Tholerus, Emmi
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Tolias, Panagiot ...
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Olivares, Pablo ...
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Weckmann, Armin
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Zhou, Yushan
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Zychor, I.
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Binda, Federico, ...
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Cecconello, Marc ...
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Conroy, Sean
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Dzysiuk, Natalii ...
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Ericsson, Göran
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Eriksson, Jacob, ...
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Hellesen, Carl, ...
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Hjalmarsson, And ...
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Possnert, Göran, ...
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Sjöstrand, Henri ...
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Skiba, Mateusz, ...
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Weiszflog, Matth ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Fusion Plasma an ...
- Articles in the publication
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Nuclear Material ...
- By the university
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Royal Institute of Technology
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Uppsala University