A convergence study for the Laguerre expansion in the moment equation method for neoclassical transport in general toroidal plasmas

Journal Article · Sun Aug 15 00:00:00 EDT 2010 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3475792· OSTI ID:21432229

Nishimura, S; Sugama, H ^[1]; Maassberg, H; Beidler, C D ^[2]; Murakami, S ^[3]; Nakamura, Y; Hirooka, S ^[4]

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1. National Institute for Fusion Science, Toki 509-5292 (Japan)
2. Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, Teilinstitut Greifswald, Greifswald D-17491 (Germany)
3. Department of Engineering, Kyoto University, Kyoto 606-8501 (Japan)
4. Graduate School of Energy Science, Kyoto University, Uji 611-0011 (Japan)

The dependence of neoclassical parallel flow calculations on the maximum order of Laguerre polynomial expansions is investigated in a magnetic configuration of the Large Helical Device [S. Murakami, A. Wakasa, H. Maassberg, et al., Nucl. Fusion 42, L19 (2002)] using the monoenergetic coefficient database obtained by an international collaboration. On the basis of a previous generalization (the so-called Sugama-Nishimura method [H. Sugama and S. Nishimura, Phys. Plasmas 15, 042502 (2008)]) to an arbitrary order of the expansion, the 13 M, 21 M, and 29 M approximations are compared. In a previous comparison, only the ion distribution function in the banana collisionality regime of single-ion-species plasmas in tokamak configurations was investigated. In this paper, the dependence of the problems including electrons and impurities in the general collisionality regime in an actual nonsymmetric toroidal configuration is reported. In particular, qualities of approximations for the electron distribution function are investigated in detail.

• OSTI ID: 21432229
• Journal Information: Physics of Plasmas, Vol. 17, Issue 8; Other Information: DOI: 10.1063/1.3475792; (c) 2010 American Institute of Physics; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CONVERGENCE
DISTRIBUTION FUNCTIONS
ELECTRONS
LAGUERRE POLYNOMIALS
LHD DEVICE
MOMENTS METHOD
NEOCLASSICAL TRANSPORT THEORY
PLASMA
PLASMA IMPURITIES
STOCHASTIC PROCESSES
TOKAMAK DEVICES
TOROIDAL CONFIGURATION
ANNULAR SPACE
CALCULATION METHODS
CHARGED-PARTICLE TRANSPORT THEORY
CLOSED CONFIGURATIONS
CLOSED PLASMA DEVICES
CONFIGURATION
ELEMENTARY PARTICLES
FERMIONS
FUNCTIONS
IMPURITIES
LEPTONS
MAGNETIC FIELD CONFIGURATIONS
POLYNOMIALS
SPACE
THERMONUCLEAR DEVICES
TRANSPORT THEORY