{"@context":{"@language":"en","@vocab":"https://schema.org/","citeAs":"cr:citeAs","column":"cr:column","conformsTo":"dct:conformsTo","cr":"http://mlcommons.org/croissant/","rai":"http://mlcommons.org/croissant/RAI/","data":{"@id":"cr:data","@type":"@json"},"dataType":{"@id":"cr:dataType","@type":"@vocab"},"dct":"http://purl.org/dc/terms/","examples":{"@id":"cr:examples","@type":"@json"},"extract":"cr:extract","field":"cr:field","fileProperty":"cr:fileProperty","fileObject":"cr:fileObject","fileSet":"cr:fileSet","format":"cr:format","includes":"cr:includes","isLiveDataset":"cr:isLiveDataset","jsonPath":"cr:jsonPath","key":"cr:key","md5":"cr:md5","parentField":"cr:parentField","path":"cr:path","recordSet":"cr:recordSet","references":"cr:references","regex":"cr:regex","repeated":"cr:repeated","replace":"cr:replace","sc":"https://schema.org/","separator":"cr:separator","source":"cr:source","subField":"cr:subField","transform":"cr:transform","wd":"https://www.wikidata.org/wiki/"},"@type":"sc:Dataset","conformsTo":"http://mlcommons.org/croissant/1.0","name":"Observation of Efficient Lower Hybrid Current Drive at High Density in Diverted Plasmas on the Alcator C-Mod Tokamak","url":"https://doi.org/10.7910/DVN/PZOMOI","creator":[{"@type":"Organization","name":"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"}],"description":"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.","keywords":["Physics","lower hybrid heating & current drive","parametric decay instability","scattering of waves by turbulence","scrape off layer","tokamak plasma"],"license":"https://dataverse.harvard.edu/api/datasets/:persistentId/versions/1.0/customlicense?persistentId=doi:10.7910/DVN/PZOMOI","datePublished":"2019-01-18","dateModified":"2019-01-18","includedInDataCatalog":{"@type":"DataCatalog","name":"Harvard Dataverse","url":"https://dataverse.harvard.edu"},"publisher":{"@type":"Organization","name":"Harvard Dataverse"},"version":"1.0","citeAs":"@data{DVN/PZOMOI_2019,author = {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},publisher = {Harvard Dataverse},title = {Observation of Efficient Lower Hybrid Current Drive at High Density in Diverted Plasmas on the Alcator C-Mod Tokamak},year = {2019},url = {https://doi.org/10.7910/DVN/PZOMOI}}","distribution":[{"@type":"cr:FileObject","@id":"18ja022_archival_manuscript.pdf","name":"18ja022_archival_manuscript.pdf","encodingFormat":"application/pdf","md5":"119d454fb6f8b718aa3f61974b690a14","contentSize":"1623514","description":"","contentUrl":"https://dataverse.harvard.edu/api/access/datafile/:persistentId?persistentId=doi:10.7910/DVN/PZOMOI/KQHCWB"},{"@type":"cr:FileObject","@id":"var/www/html/reports/18JA/18JA22/18ja022_fig1_data.hdf5","name":"18ja022_fig1_data.hdf5","encodingFormat":"application/x-hdf5","md5":"897010645d6e3782f49581ea28aa19b9","contentSize":"480912","description":"","contentUrl":"https://dataverse.harvard.edu/api/access/datafile/:persistentId?persistentId=doi:10.7910/DVN/PZOMOI/BBH1RP"},{"@type":"cr:FileObject","@id":"var/www/html/reports/18JA/18JA22/18ja022_fig2_data.hdf5","name":"18ja022_fig2_data.hdf5","encodingFormat":"application/x-hdf5","md5":"503ea7de6195079d3b0066e6a811e881","contentSize":"1340456","description":"","contentUrl":"https://dataverse.harvard.edu/api/access/datafile/:persistentId?persistentId=doi:10.7910/DVN/PZOMOI/DNB7OQ"},{"@type":"cr:FileObject","@id":"var/www/html/reports/18JA/18JA22/18ja022_fig3_data.hdf5","name":"18ja022_fig3_data.hdf5","encodingFormat":"application/x-hdf5","md5":"d3c01c1ab91149a259207fe879a7eb03","contentSize":"26640","description":"","contentUrl":"https://dataverse.harvard.edu/api/access/datafile/:persistentId?persistentId=doi:10.7910/DVN/PZOMOI/Z0FM3L"},{"@type":"cr:FileObject","@id":"var/www/html/reports/18JA/18JA22/18ja022_fig4a_data.hdf5","name":"18ja022_fig4a_data.hdf5","encodingFormat":"application/x-hdf5","md5":"cdc56b06dd8b270bc1a04614d56dc7e5","contentSize":"31056","description":"","contentUrl":"https://dataverse.harvard.edu/api/access/datafile/:persistentId?persistentId=doi:10.7910/DVN/PZOMOI/8WLKUB"},{"@type":"cr:FileObject","@id":"var/www/html/reports/18JA/18JA22/18ja022_fig4b_data.hdf5","name":"18ja022_fig4b_data.hdf5","encodingFormat":"application/x-hdf5","md5":"d86523c8ee028136bcb2a039b0e56a32","contentSize":"31056","description":"","contentUrl":"https://dataverse.harvard.edu/api/access/datafile/:persistentId?persistentId=doi:10.7910/DVN/PZOMOI/FMZ7CN"}]}