Impurity transport in tokamaks in the plateau to Pfirsch-Schlüter regimes

Ming Sheng Chu; John M. Rawls; Seung Kai Wong; F. L. Hinton

doi:10.1063/1.861701

Impurity transport in tokamaks in the plateau to Pfirsch-Schlüter regimes

Ming Sheng Chu, John M. Rawls, Seung Kai Wong, F. L. Hinton

Institute of Space and Plasma Sciences

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

4 Citations (Scopus)

Abstract

Neoclassical transport coefficients for ion and impurity species are computed in a large aspect ratio toroidal magnetic confinement system for intermediate-to-high collision frequencies. A large range of values of the relevant density and charge parameters is explored and terms of order (m _i/m_l)^1/2 are retained. The behavior of the transport coefficients is found to depend on the collisionality of both the ions and the impurities. A simple approximate analytic representation of these results which incorporates the correct asymptotic plateau and Pfirsch-Schlüter behavior is presented. In the plateau regime, when (n _l/n_i)(m_l/m_i)^1/2≪1, the inward impurity flux is found to be suppressed for experimentally obtainable plasma parameters, implying that the time scale for impurity concentration could be too long to be observable.

Original language	English
Pages (from-to)	127-135
Number of pages	9
Journal	Physics of Fluids
Volume	20
Issue number	1
DOIs	https://doi.org/10.1063/1.861701
Publication status	Published - 1977

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Fluid Flow and Transfer Processes
Computational Mechanics

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10.1063/1.861701

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title = "Impurity transport in tokamaks in the plateau to Pfirsch-Schl{\"u}ter regimes",

abstract = "Neoclassical transport coefficients for ion and impurity species are computed in a large aspect ratio toroidal magnetic confinement system for intermediate-to-high collision frequencies. A large range of values of the relevant density and charge parameters is explored and terms of order (m i/ml)1/2 are retained. The behavior of the transport coefficients is found to depend on the collisionality of both the ions and the impurities. A simple approximate analytic representation of these results which incorporates the correct asymptotic plateau and Pfirsch-Schl{\"u}ter behavior is presented. In the plateau regime, when (n l/ni)(ml/mi)1/2≪1, the inward impurity flux is found to be suppressed for experimentally obtainable plasma parameters, implying that the time scale for impurity concentration could be too long to be observable.",

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T1 - Impurity transport in tokamaks in the plateau to Pfirsch-Schlüter regimes

AU - Chu, Ming Sheng

AU - Rawls, John M.

AU - Wong, Seung Kai

AU - Hinton, F. L.

PY - 1977

Y1 - 1977

N2 - Neoclassical transport coefficients for ion and impurity species are computed in a large aspect ratio toroidal magnetic confinement system for intermediate-to-high collision frequencies. A large range of values of the relevant density and charge parameters is explored and terms of order (m i/ml)1/2 are retained. The behavior of the transport coefficients is found to depend on the collisionality of both the ions and the impurities. A simple approximate analytic representation of these results which incorporates the correct asymptotic plateau and Pfirsch-Schlüter behavior is presented. In the plateau regime, when (n l/ni)(ml/mi)1/2≪1, the inward impurity flux is found to be suppressed for experimentally obtainable plasma parameters, implying that the time scale for impurity concentration could be too long to be observable.

AB - Neoclassical transport coefficients for ion and impurity species are computed in a large aspect ratio toroidal magnetic confinement system for intermediate-to-high collision frequencies. A large range of values of the relevant density and charge parameters is explored and terms of order (m i/ml)1/2 are retained. The behavior of the transport coefficients is found to depend on the collisionality of both the ions and the impurities. A simple approximate analytic representation of these results which incorporates the correct asymptotic plateau and Pfirsch-Schlüter behavior is presented. In the plateau regime, when (n l/ni)(ml/mi)1/2≪1, the inward impurity flux is found to be suppressed for experimentally obtainable plasma parameters, implying that the time scale for impurity concentration could be too long to be observable.

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Impurity transport in tokamaks in the plateau to Pfirsch-Schlüter regimes

Abstract

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