DC Field | Value | Language |
---|---|---|
dc.contributor.author | Henderson, S. S. | ko |
dc.contributor.author | Jeong, C. | ko |
dc.contributor.author | Kwak, Sehyun | ko |
dc.date.accessioned | 2020-01-23T07:20:13Z | - |
dc.date.available | 2020-01-23T07:20:13Z | - |
dc.date.created | 2020-01-23 | - |
dc.date.created | 2020-01-23 | - |
dc.date.created | 2020-01-23 | - |
dc.date.issued | 2019-01 | - |
dc.identifier.citation | NUCLEAR MATERIALS AND ENERGY, v.18, pp.147 - 152 | - |
dc.identifier.issn | 2352-1791 | - |
dc.identifier.uri | http://hdl.handle.net/10203/271817 | - |
dc.description.abstract | 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. | - |
dc.language | English | - |
dc.publisher | ELSEVIER | - |
dc.title | An assessment of nitrogen concentrations from spectroscopic measurements in the JET and ASDEX upgrade divertor | - |
dc.type | Article | - |
dc.identifier.wosid | 000460107500026 | - |
dc.identifier.scopusid | 2-s2.0-85058630263 | - |
dc.type.rims | ART | - |
dc.citation.volume | 18 | - |
dc.citation.beginningpage | 147 | - |
dc.citation.endingpage | 152 | - |
dc.citation.publicationname | NUCLEAR MATERIALS AND ENERGY | - |
dc.identifier.doi | 10.1016/j.nme.2018.12.012 | - |
dc.contributor.nonIdAuthor | Henderson, S. S. | - |
dc.contributor.nonIdAuthor | Jeong, C. | - |
dc.description.isOpenAccess | Y | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | Impurity | - |
dc.subject.keywordAuthor | Nitrogen | - |
dc.subject.keywordAuthor | Divertor | - |
dc.subject.keywordAuthor | Concentration | - |
dc.subject.keywordAuthor | Spectroscopy | - |
dc.subject.keywordAuthor | Tokamak | - |
dc.subject.keywordPlus | CONFINEMENT | - |
dc.subject.keywordPlus | DISCHARGES | - |
dc.subject.keywordPlus | ENRICHMENT | - |
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