英国物理学会
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作者:Jungpyo Lee , Felix I. Parra , Michael Barnes
来源:[J].Nuclear Fusion(IF 2.734), 2014, Vol.54 (2)IOP
摘要:The diamagnetic flow due to the radial pressure and temperature gradients and the E × B flow due to the radial electric field induce different turbulent momentum fluxes in a tokamak. As a result, when the diamagnetic and E × B flows cancel giving zero net toroidal rotation, ...
作者:Michael Barnes , William Dorland ...
来源:[J].Plasma Physics and Controlled Fusion(IF 2.369), 2014, Vol.56 (9)IOP
摘要:Recent work has demonstrated that breaking the up–down symmetry of tokamak flux surfaces removes a constraint that limits intrinsic momentum transport, and hence toroidal rotation, to be small. We show, through MHD analysis, that ellipticity is most effective at introducing ...
作者:... Peter J Catto , Felix I Parra , Michael Barnes
来源:[J].Plasma Physics and Controlled Fusion(IF 2.369), 2014, Vol.56 (3)IOP
摘要:The induced electric field in a tokamak drives a parallel electron current flow. In an inhomogeneous, finite beta plasma, when this electron flow is comparable to the ion thermal speed, the Alfvén mode wave solutions of the electromagnetic gyrokinetic equation can become nea...
作者:Felix I Parra , Michael Barnes
来源:[J].Plasma Physics and Controlled Fusion(IF 2.369), 2015, Vol.57 (4)IOP
摘要:Self-consistent equations for intrinsic rotation in tokamaks with small poloidal magnetic field B p compared to the total magnetic field B are derived. The model gives the momentum redistribution due to turbulence, collisional transport and energy injection. Intri...
作者:Felix I Parra , Michael Barnes
来源:[J].Plasma Physics and Controlled Fusion(IF 2.369), 2015, Vol.57 (5)IOP
摘要:A set of flux tube gyrokinetic equations that includes the effect of the spatial variation of the density, temperature and rotation gradients on the turbulence is derived. This new set of equations uses periodic boundary conditions. In the limit l / L ≪ 1, where ...
作者:Justin Ball , Felix I Parra , Michael Barnes
来源:[J].Plasma Physics and Controlled Fusion(IF 2.369), 2016, Vol.58 (4)IOP
摘要:A poloidal tilting symmetry of the local nonlinear gyrokinetic model is demonstrated analytically and verified numerically. This symmetry shows that poloidally rotating all the flux surface shaping effects with large poloidal mode number by a single tilt angle has an exponen...
作者:... Felix I. Parra , Matt Landreman , Michael Barnes
来源:[J].Nuclear Fusion(IF 2.734), 2018, Vol.58 (2)IOP
摘要:Breaking the up–down symmetry of the tokamak poloidal cross-section can significantly increase the spontaneous rotation due to turbulent momentum transport. In this work, we optimize the shape of flux surfaces with both tilted elongation and tilted triangularity in order to ...
作者:Felix I. Parra , Michael Barnes , Peter J. Catto
来源:[J].Nuclear Fusion(IF 2.734), 2011, Vol.51 (11), pp.113001 (10pp)IOP
摘要:A low flow, δ f gyrokinetic formulation to obtain the intrinsic rotation profiles is presented. The momentum conservation equation in the low-flow ordering contains new terms, neglected in previous first-principles formulations, that may explain the intrinsic rotation obser...
作者:... Malgosia Daroszewska , Michael Barnes , Benoit Simard
来源:[J].Nanotechnology(IF 3.842), 2009, Vol.20 (24), pp.245701 (6pp)IOP
摘要:Single-walled carbon nanotubes (SWCNT) have been reduced with sodium naphthalide inTHF. The reduced SWCNT are not only soluble in dimethylsulfoxide (DMSO) to form astable solution/suspension, but also react spontaneously at room temperature with DMSOto evolve hydrocarbon gases an...

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