Effect of non axisymmetric perturbations on the ambipolar 𝑬ᵣ and neoclassical particle flux inside the ITER pedestal region

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dc.contributor.author Reynolds Barredo, José Miguel
dc.contributor.author Tribaldos Macía, Víctor
dc.contributor.author Loarte, A.
dc.contributor.author Polevoi, A.R.
dc.contributor.author Hosokawa, M.
dc.contributor.author Sánchez Fernández, Luis Raúl
dc.date.accessioned 2020-09-03T11:40:12Z
dc.date.available 2021-07-16T23:00:04Z
dc.date.issued 2020-07-16
dc.identifier.bibliographicCitation Nuclear fusion, 60(8), 086017
dc.identifier.issn 0029-5515
dc.identifier.issn 1741-4326 (online)
dc.identifier.uri http://hdl.handle.net/10016/30789
dc.description.abstract The transport dynamics of impurities in the pedestal region of ITER plasmas is of crucial interest since this regulates the penetration of impurities from the edge into the core plasma, where an excessive accumulation of impurities can degrade their fusion performance. In the pedestal region of H-mode tokamak plasmas anomalous transport is highly reduced and impurity transport is found to be well described by neoclassical theory. Under these conditions, perturbations to the axisymmetric tokamak geometry can strongly affect both radial electric field and particle transport. In this work, we describe the results of numerical studies performed to quantify the effects on the pedestal ambipolar electric field and radial particle fluxes of the non-axisymmetric fields, associated with both the intrinsic toroidal field ripple and extrinsic fields applied for ELM control, for ITER Q = 10 plasma conditions with emphasis on high Z impurity transport. It is found that the effect of the ITER toroidal field ripple on high Z impurity transport is negligible. On the contrary, extrinsic three-dimensional fields applied for ELM control cause a strong modification of the pedestal ambipolar electric (to less negative values) and the appearance of multi-valued solutions for the pedestal electric field, analogue to core stellarator transport significantly increasing the outward character of neoclassical pedestal transport for both the main plasma ions (D and T in ITER) and high Z impurities, suggesting a strong modification of the background plasma profiles. Finally, it is found that, for the Z impurity, its quantitative evaluation has uncertainties (with important implications for the radial ow direction) associated with the high poloidal Mach number ~ 1, due to the high pedestal electric field....
dc.format.extent 21
dc.language.iso eng
dc.publisher IAEA
dc.rights © 2020 IAEA, Vienna
dc.title Effect of non axisymmetric perturbations on the ambipolar 𝑬ᵣ and neoclassical particle flux inside the ITER pedestal region
dc.type article
dc.subject.eciencia Economía
dc.identifier.doi https://doi.org/10.1088/1741-4326/ab992e
dc.rights.accessRights openAccess
dc.relation.projectID Comunidad de Madrid. SIMTURB-CM-UC3M
dc.relation.projectID Gobierno de España. ENE2015-68265-P
dc.relation.projectID Gobierno de España. UNC313- 4E-2361
dc.relation.projectID Gobierno de España. ENE2009-12213-C03-03
dc.relation.projectID Gobierno de España. ENE2012-33219
dc.relation.projectID Gobierno de España. ENE2012-31753
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 1
dc.identifier.publicationissue 8, 086017
dc.identifier.publicationlastpage 21
dc.identifier.publicationtitle NUCLEAR FUSION
dc.identifier.publicationvolume 60
dc.identifier.uxxi AR/0000025879
dc.contributor.funder Comunidad de Madrid
dc.contributor.funder Ministerio de Economía y Competitividad (España)
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