{"dcterms:modified":"2021-04-01","dcterms:creator":"A Dataverse Instance","@type":"ore:ResourceMap","@id":"https://dataverse.harvard.edu/api/datasets/export?exporter=OAI_ORE&persistentId=doi:10.7910/DVN/B6UXHT","ore:describes":{"Title":"Alfven eigenmodes and fast ion transport in negative triangularity DIII-D plasmas","citation:Notes":"<a href=\"http://library.psfc.mit.edu/catalog/reports/2010/19ja/19ja086/abstract.php\">PSFC REPORT PSFC/JA-19-86</a><br /><br />This material is based upon work supported in part by the  U.S. Department of Energy, Office of Science, Office of  Fusion Energy Sciences, using the DIII-D National Fusion  Facility, a DOE Office of Science user facility, under Awards  DE-FC02-04ER54698, SC-G903402, DE-AC02-09CH11466,  DE-AC05-00OR22725. DIII-D data shown in this paper can  be obtained in digital format by following the links at https:// fusion.gat.com/global/D3D_DMP. Effective beam stopping  cross sections used in the beam ion birth profile calculations  were obtained from the Atomic Data and Analysis Structure (ADAS) compilation. The originating developer of ADAS is  the JET Joint Undertaking.","Subject":"Physics","Author":{"author:Name":"Van Zeeland, M.A.; Collins, C.S.; Heidbrink, W.W.; Austin, M.E.; Du, X.D.; Duarte, V.N.; Hyatt, A.; Kramer, G.; Gorelenkov, N.; Grierson, B.; Lin, D.; Marinoni, A.; McKee, G.; Muscatello, C.; Petty, C.; Sung, C.; Thome, K.E.; Walker, M.; Zhu, Y.B."},"citation:Description":{"dsDescription:Text":"The first energetic particle experiments in negative triangularity tokamak plasmas have been  carried out on DIII-D. Alfvén eigenmode (AE) activity and associated fast ion transport  comparable to that in positive triangularity is observed during the current ramp portion of all  plasmas with early beam heating indicating negative triangularity does not confer a special  advantage with respect to AE induced transport. In these discharges, a range of mode activity  driven by the sub-Alfvénic (Vbeam/VA < 0.5) 80 kV neutral beams is found including beta  induced Alfvén acoustic eigenmodes, beta induced Alfvén eigenmodes, reversed shear Alfvén  eigenmodes (RSAEs) and toroidicity induced Alfvén eigenmodes (TAEs). Mode intermittency  and possibly chirping appears to be more common than comparable positive triangularity  and/or oval discharges but overall, the unstable spectra and mode amplitudes observed on  magnetics, CO2 interferometry, and electron cyclotron emission in a set of matched positive  and negative triangularity cases at moderate beam power is similar. Large levels of Alfvén  eigenmode induced fast ion transport are found in both positive and negative triangularity with  up to 70% central fast ion pressure deficits relative to classical predictions early during the  current ramp phase for discharges with 3 MW injected 80 kV neutral beam power. The deficit  in both cases is reduced toward zero as the current penetrates and eventually reaches classical  levels during current flattop with qmin ≈ 1. Fast ion transport in negative triangularity plasmas  measured using a beam modulation technique show very similar levels to those measured  in oval plasmas over the range of tested beam powers (Pbeam ≈ 2–7 MW). This similarity is  found despite quite different unstable spectra in the highest beam power case where a mixture  of coherent and quasi-coherent modes in the TAE frequency range are observed in negative  triangularity and a spectrum of more typical narrowband TAEs and RSAEs is observed for the  oval plasmas."},"citation:Contact":{"datasetContact:E-mail":"vanzeeland@fusion.gat.com"},"citation:Keyword":[{"keyword:Term":"Alfven waves"},{"keyword:Term":"fusion products"},{"keyword:Term":"magnetohydrodynamic waves"},{"keyword:Term":"MHD stability"},{"keyword:Term":"plasma heating by particle beams"},{"keyword:Term":"tokamaks"}],"@id":"doi:10.7910/DVN/B6UXHT","@type":["ore:Aggregation","schema:Dataset"],"schema:version":"1.0","schema:datePublished":"2021-04-01","schema:name":"Alfven eigenmodes and fast ion transport in negative triangularity DIII-D plasmas","schema:dateModified":"2021-04-01 12:39:52.716","dvcore:fileTermsOfAccess":{"dvcore:fileRequestAccess":false},"schema:includedInDataCatalog":"Plasma Science and Fusion Center Dataverse","ore:aggregates":[{"schema:description":"","schema:name":"19ja086_archival_manuscript.pdf","dvcore:restricted":false,"schema:version":1,"dvcore:datasetVersionId":238098,"@id":"https://dataverse.harvard.edu/file.xhtml?fileId=4494431","schema:sameAs":"https://dataverse.harvard.edu/api/access/datafile/4494431","@type":"ore:AggregatedResource","schema:fileFormat":"application/pdf","dvcore:filesize":3325817,"dvcore:storageIdentifier":"s3://dvn-cloud:1788e4dcc87-23afa65bc00d","dvcore:rootDataFileId":-1,"dvcore:checksum":{"@type":"MD5","@value":"50b9a152ceaef6e30c95790605281f61"}}],"schema:hasPart":["https://dataverse.harvard.edu/file.xhtml?fileId=4494431"]},"@context":{"Author":"http://purl.org/dc/terms/creator","Subject":"http://purl.org/dc/terms/subject","Title":"http://purl.org/dc/terms/title","author":"https://dataverse.org/schema/citation/author#","citation":"https://dataverse.org/schema/citation/","datasetContact":"https://dataverse.org/schema/citation/datasetContact#","dcterms":"http://purl.org/dc/terms/","dsDescription":"https://dataverse.org/schema/citation/dsDescription#","dvcore":"https://dataverse.org/schema/core#","keyword":"https://dataverse.org/schema/citation/keyword#","ore":"http://www.openarchives.org/ore/terms/","schema":"http://schema.org/"}}