dc.creator | Bernert, M. | es |
dc.creator | Brezinsek, S. | es |
dc.creator | Carr, M. | es |
dc.creator | Henderson, S.S. | es |
dc.creator | Cavedon, M. | es |
dc.creator | Jet Contributors | es |
dc.creator | García Muñoz, Manuel | es |
dc.date.accessioned | 2020-07-08T14:42:58Z | |
dc.date.available | 2020-07-08T14:42:58Z | |
dc.date.issued | 2019-01 | |
dc.identifier.citation | Bernert, M., Brezinsek, S., Carr, M., Henderson, S.S., Cavedon, M., Jet Contributors, y García Muñoz, M. (2019). An assessment of nitrogen concentrations from spectroscopic measurements in the JET and ASDEX upgrade divertor. Nuclear Materials and Energy, 18, 147-152. | |
dc.identifier.issn | 2352-1791 | es |
dc.identifier.uri | https://hdl.handle.net/11441/99065 | |
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. | es |
dc.description.sponsorship | EURATOM 633053 | es |
dc.description.sponsorship | Research Councils UK EP/P012450/1 | es |
dc.format | application/pdf | es |
dc.format.extent | 6 p. | es |
dc.language.iso | eng | es |
dc.publisher | Elsevier | es |
dc.relation.ispartof | Nuclear Materials and Energy, 18, 147-152. | |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.subject | Impurity | es |
dc.subject | Nitrogen | es |
dc.subject | Divertor | es |
dc.subject | Concentration | es |
dc.subject | Spectroscopy | es |
dc.subject | Tokamak | es |
dc.title | An assessment of nitrogen concentrations from spectroscopic measurements in the JET and ASDEX upgrade divertor | es |
dc.type | info:eu-repo/semantics/article | es |
dcterms.identifier | https://ror.org/03yxnpp24 | |
dc.type.version | info:eu-repo/semantics/publishedVersion | es |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | es |
dc.contributor.affiliation | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear | es |
dc.relation.projectID | 633053 | es |
dc.relation.projectID | EP/P012450/1 | es |
dc.relation.publisherversion | https://doi.org/10.1016/j.nme.2018.12.012 | es |
dc.identifier.doi | 10.1016/j.nme.2018.12.012 | es |
dc.contributor.group | Universidad de Sevilla. RNM138: Física Nuclear Aplicada | es |
dc.journaltitle | Nuclear Materials and Energy | es |
dc.publication.volumen | 18 | es |
dc.publication.initialPage | 147 | es |
dc.publication.endPage | 152 | es |