dc.creator | Iglesias, D. | es |
dc.creator | Bunting, P. | es |
dc.creator | Coenen, J.W. | es |
dc.creator | Matthews, G.F. | es |
dc.creator | Pitts, R.A. | es |
dc.creator | Jet Contributors | es |
dc.creator | García Muñoz, Manuel | es |
dc.date.accessioned | 2020-07-14T13:41:42Z | |
dc.date.available | 2020-07-14T13:41:42Z | |
dc.date.issued | 2018-10 | |
dc.identifier.citation | Iglesias, D., Bunting, P., Coenen, J.W., Matthews, G.F., Pitts, R.A., Jet Contributors, y García Muñoz, M. (2018). An improved model for the accurate calculation of parallel heat fluxes at the JET bulk tungsten outer divertor. Nuclear Fusion, 58, 1-17. | |
dc.identifier.issn | 1741-4326 | es |
dc.identifier.uri | https://hdl.handle.net/11441/99387 | |
dc.description.abstract | Parallel heat flux calculations at the JET divertor have been based on the assumption that
all incoming heat is due to the projection of the heat flux parallel to the magnetic line, q ,
plus a constant background. This simplification led to inconsistencies during the analysis of
a series of dedicated tungsten melting experiments performed in 2013, for which infrared
(IR) thermography surface measurements could not be recreated through simulations unless
the parallel heat flux was reduced by 80% for L-mode and 60% for H-mode. We give an
explanation for these differences using a new IR inverse analysis code, a set of geometrical
corrections, and most importantly an additional term for the divertor heat flux accounting for
non-parallel effects such as cross-field transport, recycled neutrals or charge exchange. This
component has been evaluated comparing four different geometries with impinging angles
varying from 2 to 90°. Its magnitude corresponds to 1.2%–1.9% of q , but because it is not
affected by the magnetic projection, it accounts for up to 20%–30% of the tile surface heat
flux. The geometrical corrections imply a further reduction of 24% of the measured heat
flux. In addition, the application of the new inverse code increases the accuracy of the tile
heat flux calculation, eliminating any previous discrepancy. The parallel heat flux computed
with this new model is actually much lower than previously deduced by inverse analysis of IR temperatures—40% for L-mode and 50% for H-mode—while being independent of
the geometry on which it is measured. This main result confirms the validity of the optical
projection as long as a non-constant and non-parallel component is considered. For a given
total heating power, the model predicts over 10% reduction of the maximum tile surface
heat flux compared to strict optical modelling, as well as a 30% reduced sensitivity to
manufacturing and assembling tolerances. These conclusions, along with the improvement in
the predictability of the divertor thermal behaviour, are critical for JET future DT operations,
and are also directly applicable to the design of the ITER divertor monoblocks. | es |
dc.description.sponsorship | EURATOM 633053 | es |
dc.format | application/pdf | es |
dc.format.extent | 18 p. | es |
dc.language.iso | eng | es |
dc.publisher | Elsevier | es |
dc.relation.ispartof | Nuclear Fusion, 58, 1-17. | |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.subject | JET | es |
dc.subject | Divertor | es |
dc.subject | Parallel heat flux | es |
dc.subject | Optical projection | es |
dc.subject | ITER-like wall | es |
dc.title | An improved model for the accurate calculation of parallel heat fluxes at the JET bulk tungsten outer 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.publisherversion | https://doi.org/10.1088/1741-4326/aad83e | es |
dc.identifier.doi | 10.1088/1741-4326/aad83e | es |
dc.contributor.group | Universidad de Sevilla. RNM138: Física Nuclear Aplicada | es |
dc.journaltitle | Nuclear Fusion | es |
dc.publication.volumen | 58 | es |
dc.publication.initialPage | 1 | es |
dc.publication.endPage | 17 | es |