Validity of the impurity entrainment assumption in the thermal stability analysis of multifaceted asymmetric radiation from the edge (MARFEs) in tokamak plasmas

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.872138· OSTI ID:435188

Stacey, W M ^[1]

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1. Fusion Research Center, Georgia Institute of Technology, Atlanta, Georgia 30332-0225 (United States)

The assumption that impurity ion perturbations are entrained in phase and in fixed proportion with the main plasma ion perturbations is commonly made in analyses of radiative thermal instabilities in the edge of tokamak plasmas, leading to multifaceted asymmetric radiation from the edge (MARFE). An analysis in which the impurity ion perturbations are treated separately from the plasma ion perturbations demonstrates that this assumption does not alter the conclusion of the analysis regarding stability limits or edge density limits for the (m=0, k{sub {parallel}}=0) mode, but that inclusion of a separate impurity ion perturbation in the analysis stabilizes the (m{gt}0, k{sub {parallel}}{ne}0) modes. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 435188
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 1 Vol. 4; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALGORITHMS
BOUNDARY LAYERS
IMPURITIES
ION TEMPERATURE
MAGNETIC CONFINEMENT
PERTURBATION THEORY
PLASMA IMPURITIES
PLASMA INSTABILITY
TOKAMAK DEVICES
plasma toroidal confinement
thermal stability