{"id":3345635,"identifier":"DVN/PZOMOI","persistentUrl":"https://doi.org/10.7910/DVN/PZOMOI","protocol":"doi","authority":"10.7910","separator":"/","publisher":"Harvard Dataverse","publicationDate":"2019-01-18","storageIdentifier":"file://10.7910/DVN/PZOMOI","datasetType":"dataset","datasetVersion":{"id":149607,"datasetId":3345635,"datasetPersistentId":"doi:10.7910/DVN/PZOMOI","storageIdentifier":"file://10.7910/DVN/PZOMOI","versionNumber":1,"versionMinorNumber":0,"versionState":"RELEASED","latestVersionPublishingState":"RELEASED","deaccessionLink":"","lastUpdateTime":"2019-01-18T14:42:22Z","releaseTime":"2019-01-18T14:42:22Z","createTime":"2019-01-18T14:41:42Z","publicationDate":"2019-01-18","citationDate":"2019-01-18","termsOfUse":"This dataset is made available without information on how it can be used. You should communicate with the Contact(s) specified before use.","fileAccessRequest":false,"metadataBlocks":{"citation":{"displayName":"Citation Metadata","name":"citation","fields":[{"typeName":"title","multiple":false,"typeClass":"primitive","value":"Observation of Efficient Lower Hybrid Current Drive at High Density in Diverted Plasmas on the Alcator C-Mod Tokamak"},{"typeName":"author","multiple":true,"typeClass":"compound","value":[{"authorName":{"typeName":"authorName","multiple":false,"typeClass":"primitive","value":"S. G. Baek, G. M. Wallace, P. T. Bonoli, D. Brunner, I. C. Faust, A. E. Hubbard, J. W. Hughes, B. LaBombard, R. R. Parker, M. Porkolab, S. Shiraiwa, S. Wukitch"}}]},{"typeName":"datasetContact","multiple":true,"typeClass":"compound","value":[{"datasetContactEmail":{"typeName":"datasetContactEmail","multiple":false,"typeClass":"primitive","value":"sgbaek@psfc.mit.edu"}}]},{"typeName":"dsDescription","multiple":true,"typeClass":"compound","value":[{"dsDescriptionValue":{"typeName":"dsDescriptionValue","multiple":false,"typeClass":"primitive","value":"Efficient lower hybrid current drive (LHCD) is demonstrated at densities up to ne≈1.5×10^20 m^-3 in diverted plasmas on the Alcator C-Mod tokamak by operating at increased plasma current - and therefore reduced Greenwald density fraction. This density exceeds the nominal \"LH density limit\" at ne≈1.0×10^20 m^-3 reported previously, above which an anomalous loss of current drive efficiency was observed. The recovery of current drive efficiency to a level consistent with engineering scalings is correlated with a reduction in density shoulders and turbulence levels in the far scrape-off layer. Concurrently, rf wave interaction with the edge and/or scrape-off-layer plasma is reduced, as indicated by a minimal broadening of the wave frequency spectrum measured at the plasma edge. These results have important implications for sustaining steady-state tokamak operation and indicate a pathway forward for implementing efficient LHCD in a reactor."}}]},{"typeName":"subject","multiple":true,"typeClass":"controlledVocabulary","value":["Physics"]},{"typeName":"keyword","multiple":true,"typeClass":"compound","value":[{"keywordValue":{"typeName":"keywordValue","multiple":false,"typeClass":"primitive","value":"lower hybrid heating & current drive"}},{"keywordValue":{"typeName":"keywordValue","multiple":false,"typeClass":"primitive","value":"parametric decay instability"}},{"keywordValue":{"typeName":"keywordValue","multiple":false,"typeClass":"primitive","value":"scattering of waves by turbulence"}},{"keywordValue":{"typeName":"keywordValue","multiple":false,"typeClass":"primitive","value":"scrape off layer"}},{"keywordValue":{"typeName":"keywordValue","multiple":false,"typeClass":"primitive","value":"tokamak plasma"}}]},{"typeName":"notesText","multiple":false,"typeClass":"primitive","value":"<a href=\"http://library.psfc.mit.edu/catalog/reports/2010/18ja/18ja022/abstract.php\">PSFC REPORT PSFC/JA-18-22</a><br /><br />This research was conducted on Alcator C-Mod, a DOE Office of Science User Facility, and is supported by DOE Contract No. DE-FC02-99ER54512"}]}},"files":[{"description":"","label":"18ja022_archival_manuscript.pdf","restricted":false,"version":1,"datasetVersionId":149607,"dataFile":{"id":3345640,"persistentId":"doi:10.7910/DVN/PZOMOI/KQHCWB","pidURL":"https://doi.org/10.7910/DVN/PZOMOI/KQHCWB","filename":"18ja022_archival_manuscript.pdf","contentType":"application/pdf","friendlyType":"Adobe 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G. Baek, G. M. Wallace, P. T. Bonoli, D. Brunner, I. C. Faust, A. E. Hubbard, J. W. Hughes, B. LaBombard, R. R. Parker, M. Porkolab, S. Shiraiwa, S. Wukitch, 2019, \"Observation of Efficient Lower Hybrid Current Drive at High Density in Diverted Plasmas on the Alcator C-Mod Tokamak\", https://doi.org/10.7910/DVN/PZOMOI, Harvard Dataverse, V1"}}