Overview of first Wendelstein 7-X high-performance operation

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dc.contributor.authorBaldzuhn, J.
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dc.contributor.authorPuig Sitjes, A.
dc.contributor.authorPurps, F.
dc.contributor.authorRack, M.
dc.contributor.authorRécsei, S.
dc.contributor.authorKöchl, F.
dc.contributor.authorReiman, A.
dc.contributor.authorReimold, F.
dc.contributor.authorReiter, D.
dc.contributor.authorRemppel, F.
dc.contributor.authorFontdecaba, J.
dc.contributor.authorRenard, S.
dc.contributor.authorBanduch, M.
dc.contributor.authorRiedl, R.
dc.contributor.authorRiemann, J.
dc.contributor.authorRisse, K.
dc.contributor.authorKolesnichenko, Y.
dc.contributor.authorRohde, V.
dc.contributor.authorRöhlinger, H.
dc.contributor.authorRomé, M.
dc.contributor.authorRondeshagen, D.
dc.contributor.authorRong, P.
dc.contributor.authorFord, O.
dc.contributor.authorRoth, B.
dc.contributor.authorRudischhauser, L.
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dc.date.accessioned2022-02-09T14:16:08Z
dc.date.available2022-02-09T14:16:08Z
dc.date.issued2019-06-05
dc.date.updated2022-02-06T00:49:47Z
dc.description.abstractThe 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.en
dc.description.sponsorshipEC/H2020/633053/EU/Implementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium/Euratomen
dc.identifier.eissn1741-4326
dc.identifier.issn0029-5515
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/16325
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-15100
dc.language.isoenen
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/en
dc.subject.ddc004 Datenverarbeitung; Informatikde
dc.subject.otherstellaratoren
dc.subject.otherdivertoren
dc.subject.otherECR heatingen
dc.subject.otherNBI heatingen
dc.subject.otherplasma performanceen
dc.subject.otherturbulenceen
dc.subject.otherimpuritiesen
dc.titleOverview of first Wendelstein 7-X high-performance operationen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.articlenumber112004en
dcterms.bibliographicCitation.doi10.1088/1741-4326/ab03a7en
dcterms.bibliographicCitation.issue11en
dcterms.bibliographicCitation.journaltitleNuclear Fusionen
dcterms.bibliographicCitation.originalpublishernameIOPen
dcterms.bibliographicCitation.originalpublisherplaceBristolen
dcterms.bibliographicCitation.volume59en
tub.accessrights.dnbfreeen
tub.affiliationFak. 2 Mathematik und Naturwissenschaften::Inst. Theoretische Physikde
tub.affiliation.facultyFak. 2 Mathematik und Naturwissenschaftende
tub.affiliation.groupN/A (Not Applicable)de
tub.affiliation.instituteInst. Theoretische Physikde
tub.publisher.universityorinstitutionTechnische Universität Berlinen

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