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**Harvard**

Landreman, M., Parra, F., Catto, P., Ernst, D. och Pusztai, I. (2013) *Global delta-f neoclassical calculations in a pedestal*.

** BibTeX **

@conference{

Landreman2013,

author={Landreman, M. and Parra, F. I. and Catto, P. J. and Ernst, D. R. and Pusztai, István},

title={Global delta-f neoclassical calculations in a pedestal},

booktitle={55th Annual Meeting of the APS Division of Plasma Physics, Denver CO, USA, Bulletin of the American Physical Society},

pages={PP8.00036},

abstract={Conventional calculations of neoclassical flows, current, and fluxes may not be valid in the pedestal since the strong gradients violate the assumed ordering, yet accurate calculation of these quantities is important for understanding edge stability and confinement. We have therefore developed a new radially global continuum neoclassical code PERFECT [1] which allows some radial scale lengths to be as small as the poloidal ion gyroradius. A strong radial electric field with strong shear is also included. In contrast to conventional neoclassical calculations, sources of particles and energy must be determined self-consistently to find the correction to the Maxwellian. The full linearized Fokker-Planck collision operator is implemented, arbitrary collisionality is allowed, and an arbitrary number of species are permitted. Efficiency is aided by a new spectral discretization for velocity space [2] and a preconditioned Krylov-space solver. At large aspect ratio, precise agreement is obtained between the code and recent analytic theory that accounts for finite orbit width effects. At realistic aspect ratio, strong poloidal asymmetries can arise in the flow, breaking the usual form for flows on a flux surface. [1] PPCF 54, 115006 (2012). [2] J Comp Phys 243, 130 (2013).},

year={2013},

keywords={drift-kinetic, neoclassical transport, simulation code, finite orbit width, pedestal, H-mode},

}

** RefWorks **

RT Conference Proceedings

SR Print

ID 189208

A1 Landreman, M.

A1 Parra, F. I.

A1 Catto, P. J.

A1 Ernst, D. R.

A1 Pusztai, István

T1 Global delta-f neoclassical calculations in a pedestal

YR 2013

T2 55th Annual Meeting of the APS Division of Plasma Physics, Denver CO, USA, Bulletin of the American Physical Society

AB Conventional calculations of neoclassical flows, current, and fluxes may not be valid in the pedestal since the strong gradients violate the assumed ordering, yet accurate calculation of these quantities is important for understanding edge stability and confinement. We have therefore developed a new radially global continuum neoclassical code PERFECT [1] which allows some radial scale lengths to be as small as the poloidal ion gyroradius. A strong radial electric field with strong shear is also included. In contrast to conventional neoclassical calculations, sources of particles and energy must be determined self-consistently to find the correction to the Maxwellian. The full linearized Fokker-Planck collision operator is implemented, arbitrary collisionality is allowed, and an arbitrary number of species are permitted. Efficiency is aided by a new spectral discretization for velocity space [2] and a preconditioned Krylov-space solver. At large aspect ratio, precise agreement is obtained between the code and recent analytic theory that accounts for finite orbit width effects. At realistic aspect ratio, strong poloidal asymmetries can arise in the flow, breaking the usual form for flows on a flux surface. [1] PPCF 54, 115006 (2012). [2] J Comp Phys 243, 130 (2013).

LA eng

OL 30