Multifaceted asymmetric radiation from the edge suppression by external edge heating

Stacey, Weston M.

doi:10.1063/1.872123

Physics of Plasmas

1997

DOI: 10.1063/1.872123

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Multifaceted asymmetric radiation from the edge suppression by external edge heating

Weston M. Stacey

Abstract: A linear, fluid model stability analysis of a radiative plasma mantle reveals that the impurity density limit for the onset of multifaceted asymmetric radiation from the edge (MARFE) in tokamaks can be increased by external heating of the radiative mantle at the plasma edge. The required injected power is estimated to be a few MW for present experiments and a few tens of MW for future reactors.

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Thermal instability theory analysis of multifaceted asymmetric radiation from the edge (MARFE) in Tokamak Experiment for Technology Oriented Research (TEXTOR)

et al. 2001

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The density limits for a series of shots in TEXTOR [Tokamak Experiment for Technology Oriented Research, E. Hintz, P. Bogen, H. A. Claaßen et al., in Contributions to High-Temperature Plasma Physics, edited by K. H. Spatschek and J. Uhlenbusch (Akademie Verlag, Berlin, 1994, p. 373)], over a range of heating powers, that ended in multifaceted asymmetric radiation from the edge (MARFE) have been analyzed within the context of thermal instability theory. The prediction of MARFE onset agrees with observation to within the experimental uncertainty.

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Thermal instability theory analysis of multifaceted asymmetric radiation from the edge (MARFE) in Tokamak Experiment for Technology Oriented Research (TEXTOR)

et al. 2001

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Parametric dependence of density limits in the Tokamak Experiment for Technology Oriented Research (TEXTOR): Comparison of thermal instability theory with experiment

2001

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Thermal instability theory analysis of multifaceted asymmetric radiation from the edge (MARFE) in Tokamak Comment on "Explanation for MARFE formation and subsequent evolution into a detached symmetric plasma edge" [Phys. Plasmas 3, 2673 (1996], "MARFE impurity density limits in tokamaks with poloidal asymmetry and rotation" [Phys. Plasmas 3, 3032 (1996)], and "MARFE suppression by external edge heating"The observed dependence of the TEXTOR ͓Tokamak Experiment for Technology Oriented Research: E. Hintz, P. Bogen, H. A. Claassen et al., Contributions to High Temperature Plasma Physics, edited by K. H. Spatschek and J. Uhlenbusch ͑Akademie Verlag, Berlin, 1994͒, p. 373͔ density limit on global parameters ͑I, B, P, etc.͒ and wall conditioning is compared with the predicted density limit parametric scaling of thermal instability theory. It is necessary first to relate the edge parameters of the thermal instability theory to n and the other global parameters. The observed parametric dependence of the density limit in TEXTOR is generally consistent with the predicted density limit scaling of thermal instability theory. The observed wall conditioning dependence of the density limit can be reconciled with the theory in terms of the radiative emissivity temperature dependence of different impurities in the plasma edge. The thermal instability theory also provides an explanation of why symmetric detachment precedes radiative collapse for most low power shots, while a multifaceted asymmetric radiation from the edge MARFE precedes detachment for most high power shots.

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

Stacey

1997

Physics of Plasmas

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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‖=0) mode, but that inclusion of a separate impurity ion perturbation in the analysis stabilizes the (m>0, k‖≠0) modes.

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Multifaceted asymmetric radiation from the edge suppression by external edge heating

Cited by 9 publications

References 10 publications

Thermal instability theory analysis of multifaceted asymmetric radiation from the edge (MARFE) in Tokamak Experiment for Technology Oriented Research (TEXTOR)

Thermal instability theory analysis of multifaceted asymmetric radiation from the edge (MARFE) in Tokamak Experiment for Technology Oriented Research (TEXTOR)

Parametric dependence of density limits in the Tokamak Experiment for Technology Oriented Research (TEXTOR): Comparison of thermal instability theory with experiment

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

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