Nonlinear gyrokinetic simulations of the I-mode high confinement regime and comparisons with experiment

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dc.contributor.authorWhite, A. E.ko
dc.contributor.authorHoward, N. T.ko
dc.contributor.authorCreely, A. J.ko
dc.contributor.authorChilenski, M. A.ko
dc.contributor.authorGreenwald, M.ko
dc.contributor.authorHubbard, A. E.ko
dc.contributor.authorHughes, J. W.ko
dc.contributor.authorMarmar, E.ko
dc.contributor.authorRice, J. E.ko
dc.contributor.authorSierchio, J. M.ko
dc.contributor.authorSung, Choongkiko
dc.contributor.authorWalk, J. R.ko
dc.contributor.authorWhyte, D. G.ko
dc.contributor.authorMikkelsen, D. R.ko
dc.contributor.authorEdlund, E. M.ko
dc.contributor.authorKung, C.ko
dc.contributor.authorHolland, C.ko
dc.contributor.authorCandy, J.ko
dc.contributor.authorPetty, C. C.ko
dc.contributor.authorReinke, M. L.ko
dc.contributor.authorTheiler, C.ko
dc.date.accessioned2020-03-19T03:21:53Z-
dc.date.available2020-03-19T03:21:53Z-
dc.date.created2020-03-05-
dc.date.created2020-03-05-
dc.date.issued2015-05-
dc.identifier.citationPHYSICS OF PLASMAS, v.22, no.5-
dc.identifier.issn1070-664X-
dc.identifier.urihttp://hdl.handle.net/10203/272830-
dc.description.abstractFor the first time, nonlinear gyrokinetic simulations of I-mode plasmas are performed and compared with experiment. I-mode is a high confinement regime, featuring energy confinement similar to H-mode, but without enhanced particle and impurity particle confinement [D. G. Whyte et al., Nucl. Fusion 50, 105005 (2010)]. As a consequence of the separation between heat and particle transport, I-mode exhibits several favorable characteristics compared to H-mode. The nonlinear gyrokinetic code GYRO [J. Candy and R. E. Waltz, J Comput. Phys. 186, 545 (2003)] is used to explore the effects of E x B shear and profile stiffness in I-mode and compare with L-mode. The nonlinear GYRO simulations show that I-mode core ion temperature and electron temperature profiles are more stiff than L-mode core plasmas. Scans of the input E x B shear in GYRO simulations show that E x B shearing of turbulence is a stronger effect in the core of I-mode than L-mode. The nonlinear simulations match the observed reductions in long wavelength density fluctuation levels across the L-I transition but underestimate the reduction of long wavelength electron temperature fluctuation levels. The comparisons between experiment and gyrokinetic simulations for I-mode suggest that increased E x B shearing of turbulence combined with increased profile stiffness are responsible for the reductions in core turbulence observed in the experiment, and that I-mode resembles H-mode plasmas more than L-mode plasmas with regards to marginal stability and temperature profile stiffness. (C) 2015 AIP Publishing LLC.-
dc.languageEnglish-
dc.publisherAMER INST PHYSICS-
dc.titleNonlinear gyrokinetic simulations of the I-mode high confinement regime and comparisons with experiment-
dc.typeArticle-
dc.identifier.wosid000355794300116-
dc.identifier.scopusid2-s2.0-84929645854-
dc.type.rimsART-
dc.citation.volume22-
dc.citation.issue5-
dc.citation.publicationnamePHYSICS OF PLASMAS-
dc.identifier.doi10.1063/1.4921150-
dc.contributor.localauthorSung, Choongki-
dc.contributor.nonIdAuthorWhite, A. E.-
dc.contributor.nonIdAuthorHoward, N. T.-
dc.contributor.nonIdAuthorCreely, A. J.-
dc.contributor.nonIdAuthorChilenski, M. A.-
dc.contributor.nonIdAuthorGreenwald, M.-
dc.contributor.nonIdAuthorHubbard, A. E.-
dc.contributor.nonIdAuthorHughes, J. W.-
dc.contributor.nonIdAuthorMarmar, E.-
dc.contributor.nonIdAuthorRice, J. E.-
dc.contributor.nonIdAuthorSierchio, J. M.-
dc.contributor.nonIdAuthorWalk, J. R.-
dc.contributor.nonIdAuthorWhyte, D. G.-
dc.contributor.nonIdAuthorMikkelsen, D. R.-
dc.contributor.nonIdAuthorEdlund, E. M.-
dc.contributor.nonIdAuthorKung, C.-
dc.contributor.nonIdAuthorHolland, C.-
dc.contributor.nonIdAuthorCandy, J.-
dc.contributor.nonIdAuthorPetty, C. C.-
dc.contributor.nonIdAuthorReinke, M. L.-
dc.contributor.nonIdAuthorTheiler, C.-
dc.description.isOpenAccessN-
dc.type.journalArticleArticle; Proceedings Paper-
dc.subject.keywordPlusALCATOR C-MOD-
dc.subject.keywordPlusHEAT-TRANSPORT-
dc.subject.keywordPlusTEMPERATURE-
dc.subject.keywordPlusTOKAMAK-
dc.subject.keywordPlusPLASMAS-
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