000212654 001__ 212654
000212654 005__ 20190228220050.0
000212654 0247_ $$2doi$$a10.1063/1.4921150
000212654 022__ $$a1070-664X
000212654 02470 $$2ISI$$a000355794300116
000212654 037__ $$aARTICLE
000212654 245__ $$aNonlinear gyrokinetic simulations of the I-mode high confinement regime and comparisons with experiment
000212654 260__ $$bAmer Inst Physics$$c2015$$aMelville
000212654 269__ $$a2015
000212654 300__ $$a12
000212654 336__ $$aJournal Articles
000212654 520__ $$aFor 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.
000212654 700__ $$uMIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA$$aWhite, A. E.
000212654 700__ $$uMIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA$$aHoward, N. T.
000212654 700__ $$uMIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA$$aCreely, A. J.
000212654 700__ $$uMIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA$$aChilenski, M. A.
000212654 700__ $$uMIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA$$aGreenwald, M.
000212654 700__ $$uMIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA$$aHubbard, A. E.
000212654 700__ $$uMIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA$$aHughes, J. W.
000212654 700__ $$uMIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA$$aMarmar, E.
000212654 700__ $$uMIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA$$aRice, J. E.
000212654 700__ $$uMIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA$$aSierchio, J. M.
000212654 700__ $$uMIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA$$aSung, C.
000212654 700__ $$uMIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA$$aWalk, J. R.
000212654 700__ $$uMIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA$$aWhyte, D. G.
000212654 700__ $$uPrinceton Plasma Phys Lab, Princeton, NJ 08540 USA$$aMikkelsen, D. R.
000212654 700__ $$uPrinceton Plasma Phys Lab, Princeton, NJ 08540 USA$$aEdlund, E. M.
000212654 700__ $$uPrinceton Plasma Phys Lab, Princeton, NJ 08540 USA$$aKung, C.
000212654 700__ $$uUniv Calif San Diego, San Diego, CA 92093 USA$$aHolland, C.
000212654 700__ $$uGen Atom Co, San Diego, CA 92186 USA$$aCandy, J.
000212654 700__ $$uGen Atom Co, San Diego, CA 92186 USA$$aPetty, C. C.
000212654 700__ $$uUniv York, York YO10 5DD, N Yorkshire, England$$aReinke, M. L.
000212654 700__ $$aTheiler, C.
000212654 773__ $$j22$$tPhysics Of Plasmas$$k5$$q056109
000212654 909CO $$ooai:infoscience.tind.io:212654
000212654 909C0 $$0252028$$pSPC
000212654 909CO $$pSB$$particle
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000212654 917Z8 $$x112823
000212654 937__ $$aEPFL-ARTICLE-212654
000212654 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000212654 980__ $$aARTICLE