dc.creator | Guillemaut, C. | es |
dc.creator | Drewelow, P. | es |
dc.creator | Matthews, G.F. | es |
dc.creator | Kukushkin, A.S. | es |
dc.creator | Pitts, R.A. | es |
dc.creator | Jet Contributors | es |
dc.creator | García Muñoz, Manuel | es |
dc.date.accessioned | 2020-07-31T08:53:23Z | |
dc.date.available | 2020-07-31T08:53:23Z | |
dc.date.issued | 2017-08 | |
dc.identifier.citation | Guillemaut, C., Drewelow, P., Matthews, G.F., Kukushkin, A.S., Pitts, R.A., Jet Contributors, y García Muñoz, M. (2017). Main chamber wall plasma loads in JET-ITER-like wall at high radiated fraction. Nuclear Materials and Energy, 12, 234-240. | |
dc.identifier.issn | 2352-1791 | es |
dc.identifier.uri | https://hdl.handle.net/11441/100018 | |
dc.description.abstract | Future tokamak reactors of conventional design will require high levels of exhaust power dissipation (more than 90% of the input power) if power densities at the divertor targets are to remain compatible with active cooling. Impurity seeded H-mode discharges in JET-ITER-like Wall (ILW) have reached a max- imum radiative fraction ( F rad ) of ∼75%. Divertor Langmuir probe (LP) measurements in these discharges indicate, however, that less than ∼3% of the thermal plasma power reaches the targets, suggesting a missing channel for power loss. This paper presents experimental evidence from limiter LP for enhanced cross-field particle fluxes on the main chamber walls at high F rad . In H-mode nitrogen-seeded discharges with F rad increasing from ∼30% to up to ∼75%, the main chamber wall particle fluence rises by a factor ∼3 while the divertor plasma fluence drops by one order of magnitude. Contribution of main chamber wall particle losses to detachment, as suggested by EDGE2D-EIRENE modeling, is not sufficient to explain the magnitude of the observed divertor fluence reduction. An intermediate detached case obtained at F rad ∼60% with neon seeding is also presented. Heat loads were measured using the main chamber wall thermocouples. Comparison between thermocouple and bolometry measurements shows that the frac- tion of the input power transported to the main chamber wall remains below ∼5%, whatever the divertor detachment state is. Main chamber sputtering of beryllium by deuterium is reduced in detached condi- tions only on the low field side. If the fraction of power exhaust dissipated to the main chamber wall by cross-field transport in future reactors is similar to the JET-ILW levels, wall plasma power loading should not be an issue. However, other contributions such as charge exchange may be a problem. | es |
dc.description.sponsorship | EURATOM 633053 | es |
dc.format | application/pdf | es |
dc.format.extent | 7 p. | es |
dc.language.iso | eng | es |
dc.publisher | Elsevier | es |
dc.relation.ispartof | Nuclear Materials and Energy, 12, 234-240. | |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.title | Main chamber wall plasma loads in JET-ITER-like wall at high radiated fraction | 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.publisherversion | http://dx.doi.org/10.1016/j.nme.2017.02.010 | es |
dc.identifier.doi | 10.1016/j.nme.2017.02.010 | es |
dc.contributor.group | Universidad de Sevilla. RNM138: Física Nuclear Aplicada | es |
dc.journaltitle | Nuclear Materials and Energy | es |
dc.publication.volumen | 12 | es |
dc.publication.initialPage | 234 | es |
dc.publication.endPage | 240 | es |