{"@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":"Performance assessment of long-legged tightly-baffled divertor geometries in the ARC reactor concept","url":"https://doi.org/10.7910/DVN/NMVUFS","creator":[{"@type":"Person","givenName":"Brian Maxim Adam Theodore Jim Daniel Marvin Christopher Dennis","name":"Michael Robert Knox Wigram, Brian LaBombard, Maxim V. Umansky, Adam Q Kuang, Theodore Golfinopoulos, Jim L. Terry, Daniel Brunner, Marvin E. Rensink, Christopher P. Ridgers, Dennis G. Whyte"}],"description":"Extremely intense power exhaust channels are projected for tokamak-based fusion power reactors; a means to handle them remains to be demonstrated. Advanced divertor configurations have been proposed as potential solutions. Recent modelling of tightly baffled, long-legged divertor geometries for the divertor test tokamak concept, ADX, has shown that these concepts may access passively stable, fully detached regimes over a broad range of parameters. The question remains as to how such divertors may perform in a reactor setting. To explore this, numerical simulations are performed with UEDGE for the long-legged divertor geometry proposed for the ARC pilot plant conceptual design - a device with projected heat flux power width (λq||) of 0.4 mm and power exhaust of 93 MW - first for a simplified Super-X divertor configuration (SXD) and then for the actual X-point target divertor (XPTD) being proposed. It is found that the SXD, combined with 0.5% fixed-fraction neon impurity concentration, can produce passively stable, detached divertor regimes for power exhausts in the range of 80-108 MW - fully accommodating ARC's power exhaust. The XPTD configuration is found to reduce the strike-point temperature by a factor of ~10 compared to the SXD for small separations (~1.4λq||) between main and divertor X-point magnetic flux surfaces. Even greater potential reductions are identified for reducing separations to ~1λq|| or less. The power handling response is found to be insensitive to the level of cross-field convective or diffusive transport assumed in the divertor leg. By raising the separatrix density by a factor of 1.5, stable fully detached divertor solutions are obtained that fully accommodate the ARC exhaust power without impurity seeding. To our knowledge, this is the first time an impurity-free divertor power handling scenario has been obtained in edge modelling for a tokamak fusion power reactor with λq|| of 0.4 mm.","keywords":["Physics","ARC","detached","divertor","modelling","power handling","UEDGE"],"license":"https://dataverse.harvard.edu/api/datasets/:persistentId/versions/1.0/customlicense?persistentId=doi:10.7910/DVN/NMVUFS","datePublished":"2020-06-03","dateModified":"2020-06-03","includedInDataCatalog":{"@type":"DataCatalog","name":"Harvard Dataverse","url":"https://dataverse.harvard.edu"},"publisher":{"@type":"Organization","name":"Harvard Dataverse"},"version":"1.0","citeAs":"@data{DVN/NMVUFS_2020,author = {Michael Robert Knox Wigram, Brian LaBombard, Maxim V. Umansky, Adam Q Kuang, Theodore Golfinopoulos, Jim L. Terry, Daniel Brunner, Marvin E. Rensink, Christopher P. Ridgers, Dennis G. Whyte},publisher = {Harvard Dataverse},title = {Performance assessment of long-legged tightly-baffled divertor geometries in the ARC reactor concept},year = {2020},url = {https://doi.org/10.7910/DVN/NMVUFS}}","distribution":[{"@type":"cr:FileObject","@id":"19ja020_archival_manuscript.pdf","name":"19ja020_archival_manuscript.pdf","encodingFormat":"application/pdf","md5":"892c2e9895e64ddad8bdab671d230cab","contentSize":"6289757","description":"","contentUrl":"https://dataverse.harvard.edu/api/access/datafile/:persistentId?persistentId=doi:10.7910/DVN/NMVUFS/MF8VBM"}]}