Test particle simulation of non-ambipolar ion diffusion in Tokamaks

Timo Kiviniemi; Jukka Heikkinen; A.G. Peeters

doi:10.1088/0029-5515/40/9/303

Test particle simulation of non-ambipolar ion diffusion in Tokamaks

Timo Kiviniemi^*
, Jukka Heikkinen
, A.G. Peeters

^*Corresponding author for this work

VTT Technical Research Centre of Finland

Helsinki University of Technology
Max-Planck-Institut für Plasmaphysik (IPP)

Research output: Contribution to journal › Article › Scientific › peer-review

11 Citations (Scopus)

Abstract

The neoclassical return current and parallel viscosity due to the radial electric field (non-equilibrium poloidal rotation) in tokamaks are calculated using the 5-D (3-D in configuration space and 2-D in velocity space) Monte Carlo code ASCOT. Results are compared with the known neoclassical non-ambipolar return current expressions by Shaing [Phys. Fluids B 2 (1990) 2847] and Stringer [Nucl. Fusion 33 (1993) 1249] over a wide range of poloidal Mach numbers M_p = E_r/(v_tiB_θ) and for various collisionalities. Here, v_ti is the ion thermal velocity, E_r is the radial electric field and B_θ is the poloidal magnetic field. Quantitative differences exist due to a simpler collision operator and the various other approximations used in deriving the analytic expressions.

Original language	English
Pages (from-to)	1587-1596
Journal	Nuclear Fusion
Volume	40
Issue number	9
DOIs	https://doi.org/10.1088/0029-5515/40/9/303
Publication status	Published - 2000
MoE publication type	A1 Journal article-refereed

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title = "Test particle simulation of non-ambipolar ion diffusion in Tokamaks",

abstract = "The neoclassical return current and parallel viscosity due to the radial electric field (non-equilibrium poloidal rotation) in tokamaks are calculated using the 5-D (3-D in configuration space and 2-D in velocity space) Monte Carlo code ASCOT. Results are compared with the known neoclassical non-ambipolar return current expressions by Shaing [Phys. Fluids B 2 (1990) 2847] and Stringer [Nucl. Fusion 33 (1993) 1249] over a wide range of poloidal Mach numbers Mp = Er/(vtiBθ) and for various collisionalities. Here, vti is the ion thermal velocity, Er is the radial electric field and Bθ is the poloidal magnetic field. Quantitative differences exist due to a simpler collision operator and the various other approximations used in deriving the analytic expressions. ",

author = "Timo Kiviniemi and Jukka Heikkinen and A.G. Peeters",

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AU - Kiviniemi, Timo

AU - Heikkinen, Jukka

AU - Peeters, A.G.

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Y1 - 2000

N2 - The neoclassical return current and parallel viscosity due to the radial electric field (non-equilibrium poloidal rotation) in tokamaks are calculated using the 5-D (3-D in configuration space and 2-D in velocity space) Monte Carlo code ASCOT. Results are compared with the known neoclassical non-ambipolar return current expressions by Shaing [Phys. Fluids B 2 (1990) 2847] and Stringer [Nucl. Fusion 33 (1993) 1249] over a wide range of poloidal Mach numbers Mp = Er/(vtiBθ) and for various collisionalities. Here, vti is the ion thermal velocity, Er is the radial electric field and Bθ is the poloidal magnetic field. Quantitative differences exist due to a simpler collision operator and the various other approximations used in deriving the analytic expressions.

AB - The neoclassical return current and parallel viscosity due to the radial electric field (non-equilibrium poloidal rotation) in tokamaks are calculated using the 5-D (3-D in configuration space and 2-D in velocity space) Monte Carlo code ASCOT. Results are compared with the known neoclassical non-ambipolar return current expressions by Shaing [Phys. Fluids B 2 (1990) 2847] and Stringer [Nucl. Fusion 33 (1993) 1249] over a wide range of poloidal Mach numbers Mp = Er/(vtiBθ) and for various collisionalities. Here, vti is the ion thermal velocity, Er is the radial electric field and Bθ is the poloidal magnetic field. Quantitative differences exist due to a simpler collision operator and the various other approximations used in deriving the analytic expressions.

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DO - 10.1088/0029-5515/40/9/303

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VL - 40

SP - 1587

EP - 1596

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 9

ER -

Test particle simulation of non-ambipolar ion diffusion in Tokamaks

Abstract

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