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dc.contributor.authorHarvey, R. W.
dc.contributor.authorMeneghini, Orso-Maria Cornelio
dc.contributor.authorSchmidt, A. E.
dc.contributor.authorSmirnov, A. P.
dc.contributor.authorWilson, J. R.
dc.contributor.authorWallace, Gregory Marriner
dc.contributor.authorHubbard, Amanda E.
dc.contributor.authorBonoli, Paul T.
dc.contributor.authorFaust, Ian Charles
dc.contributor.authorHughes, Jerry W.
dc.contributor.authorLabombard, Brian
dc.contributor.authorParker, Ronald R.
dc.contributor.authorShiraiwa, Shunichi
dc.contributor.authorWhyte, Dennis G.
dc.contributor.authorWright, John C.
dc.contributor.authorWukitch, Stephen James
dc.date.accessioned2013-10-25T14:36:08Z
dc.date.available2013-10-25T14:36:08Z
dc.date.issued2011-07
dc.date.submitted2010-12
dc.identifier.issn0029-5515
dc.identifier.issn1741-4326
dc.identifier.urihttp://hdl.handle.net/1721.1/81774
dc.description.abstractExperimental observations of lower hybrid current drive (LHCD) at high density on the Alcator C-Mod tokamak are presented in this paper. Bremsstrahlung emission from relativistic fast electrons in the core plasma drops suddenly above line-averaged densities of 10[superscript 20] m[superscript −3] (ω/ω[subscript LH] ~ 3) in single null discharges with large (≥8 mm) inner gaps, well below the density limit previously observed on limited tokamaks (ω/ω[subscript LH] ~ 2). Modelling and experimental evidence suggest that the absence of LHCD driven fast electrons at high density may be due to parasitic collisional absorption in the scrape-off layer (SOL). Experiments show that the population of fast electrons produced by LHCD at high density ([bar over n][subscript e] > 10[superscript 20] m[superscript -3]) can be increased by operating with an inner gap of less than ~5 mm with the strongest non-thermal emission in inner wall limited plasmas. A change in plasma topology from single to double null produces a modest increase in non-thermal emission at high density. Increasing the electron temperature in the periphery of the plasma (0.8 > r/a > 1.0) also results in a modest increase in non-thermal electron emission above the density limit. Ray tracing/Fokker–Planck simulations of these discharges predict the observed sensitivity to plasma position when the effects of collisional absorption in the SOL are included in the model.en_US
dc.description.sponsorshipUnited States. Dept. of Energy (Award DE-FC02-99ER54512)en_US
dc.description.sponsorshipUnited States. Dept. of Energy (Award DE-AC02-76CH03073)en_US
dc.language.isoen_US
dc.publisherIOP Publishingen_US
dc.relation.isversionofhttp://dx.doi.org/10.1088/0029-5515/51/8/083032en_US
dc.rightsCreative Commons Attribution-Noncommercial-Share Alike 3.0en_US
dc.rights.urihttp://creativecommons.org/licenses/by-nc/3.0en_US
dc.sourceMIT Web Domainen_US
dc.titleLower hybrid current drive at high density in Alcator C-Moden_US
dc.typeArticleen_US
dc.identifier.citationWallace, G.M. et al. “Lower Hybrid Current Drive at High Density in Alcator C-Mod.” Nuclear Fusion 51.8 (2011): 083032.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Scienceen_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Nuclear Science and Engineeringen_US
dc.contributor.departmentMassachusetts Institute of Technology. Plasma Science and Fusion Centeren_US
dc.contributor.mitauthorWallace, Gregory Marrineren_US
dc.contributor.mitauthorHubbard, Amanda E.en_US
dc.contributor.mitauthorBonoli, Paul T.en_US
dc.contributor.mitauthorFaust, Ian Charlesen_US
dc.contributor.mitauthorHughes, Jerry W.en_US
dc.contributor.mitauthorLabombard, Brianen_US
dc.contributor.mitauthorMeneghini, Orso-Maria Cornelioen_US
dc.contributor.mitauthorParker, Ronald R.en_US
dc.contributor.mitauthorSchmidt, A. E.en_US
dc.contributor.mitauthorShiraiwa, Shunichien_US
dc.contributor.mitauthorWhyte, Dennis G.en_US
dc.contributor.mitauthorWright, John C.en_US
dc.contributor.mitauthorWukitch, Stephen Jamesen_US
dc.relation.journalNuclear Fusionen_US
dc.eprint.versionAuthor's final manuscripten_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsWallace, G.M.; Hubbard, A.E.; Bonoli, P.T.; Faust, I.C.; Harvey, R.W.; Hughes, J.W.; LaBombard, B.L.; Meneghini, O.; Parker, R.R.; Schmidt, A.E.; Shiraiwa, S.; Smirnov, A.P.; Whyte, D.G.; Wilson, J.R.; Wright, J.C.; Wukitch, S.J.en_US
dc.identifier.orcidhttps://orcid.org/0000-0002-9001-5606
dc.identifier.orcidhttps://orcid.org/0000-0003-4432-5504
dc.identifier.orcidhttps://orcid.org/0000-0002-7841-9261
dc.identifier.orcidhttps://orcid.org/0000-0002-1620-9680
dc.identifier.orcidhttps://orcid.org/0000-0001-5049-2769
dspace.mitauthor.errortrue
mit.licenseOPEN_ACCESS_POLICYen_US


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