Overview of first Wendelstein 7-X high-performance operation

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dc.contributor.author Klinger, T.
dc.contributor.author Gogoleva, Alena
dc.contributor.author Vela Vela, Luis Ernesto
dc.date.accessioned 2021-07-08T08:35:00Z
dc.date.available 2020-11-16T16:17:09Z
dc.date.issued 2019-11
dc.identifier.bibliographicCitation Nuclear Fusion, 2019, 59(11), 112004
dc.identifier.issn 0029-5515
dc.identifier.uri http://hdl.handle.net/10016/31417
dc.description Documento escrito por un elevado número de autores/as, sólo se referencia el/la que aparece en primer lugar y los/as autores/as pertenecientes a la UC3M.
dc.description.abstract The optimized superconducting stellarator device Wendelstein 7-X (with major radius , minor radius , and plasma volume) restarted operation after the assembly of a graphite heat shield and 10 inertially cooled island divertor modules. This paper reports on the results from the first high-performance plasma operation. Glow discharge conditioning and ECRH conditioning discharges in helium turned out to be important for density and edge radiation control. Plasma densities of with central electron temperatures were routinely achieved with hydrogen gas fueling, frequently terminated by a radiative collapse. In a first stage, plasma densities up to were reached with hydrogen pellet injection and helium gas fueling. Here, the ions are indirectly heated, and at a central density of a temperature of with was transiently accomplished, which corresponds to with a peak diamagnetic energy of and volume-averaged normalized plasma pressure . The routine access to high plasma densities was opened with boronization of the first wall. After boronization, the oxygen impurity content was reduced by a factor of 10, the carbon impurity content by a factor of 5. The reduced (edge) plasma radiation level gives routinely access to higher densities without radiation collapse, e.g. well above line integrated density and central temperatures at moderate ECRH power. Both X2 and O2 mode ECRH schemes were successfully applied. Core turbulence was measured with a phase contrast imaging diagnostic and suppression of turbulence during pellet injection was observed.
dc.description.sponsorship This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training program 2014-2018 and 2019-2020 under grant agreement No. 633053.
dc.format.extent 11
dc.language.iso eng
dc.publisher IOP Publishing
dc.rights Reconocimiento 3.0 España
dc.rights.uri http://creativecommons.org/licenses/by/3.0/es/
dc.subject.other Divertor
dc.subject.other ECR heating
dc.subject.other Impurities
dc.subject.other NBI heating
dc.subject.other Plasma performance
dc.subject.other Stellarator
dc.subject.other Turbulence
dc.title Overview of first Wendelstein 7-X high-performance operation
dc.type article
dc.type.review PeerReviewed
dc.subject.eciencia Física
dc.identifier.doi https://doi.org/10.1088/1741-4326/ab03a7
dc.rights.accessRights openAccess
dc.relation.projectID info:eu-repo/grantAgreement/EC/H2020/633053
dc.type.version publishedVersion
dc.identifier.publicationissue 11
dc.identifier.publicationtitle Nuclear Fusion
dc.identifier.publicationvolume 59
dc.identifier.uxxi AR/0000025104
dc.contributor.funder European Commission
dc.affiliation.dpto UC3M. Departamento de Física
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