Multifaceted asymmetric radiation from the edge impurity density limits in tokamaks with poloidal asymmetry and rotation

Journal Article · Thu Aug 01 04:00:00 EDT 1996 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.871639· OSTI ID:286353

Stacey, W M ^[1]

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

A linear stability analysis of two-dimensional, edge-localized thermal instabilities in tokamaks has been performed using a fluid model which incorporates the effects of large radial gradients and near-sonic rotation speeds. Sufficient stability requirements for fundamental ({ital m}=0) and harmonic ({ital m}{approx_gt}0) poloidal modes are established and used to investigate the effects of rotation, poloidal asymmetry in the equilibrium solution, parallel current, and parallel momentum injection on impurity density limits. The higher density limits due to parallel heat conduction and parallel viscosity that are associated with the {ital m}{approx_gt}0 modes, but that are absent for the {ital m}=0 mode, account for the onset and stability of MARFEs (multifaceted asymmetric radiation from the edge). Rotation and asymmetry in the equilibrium solution are significant in the determination of impurity density limits. The MARFE threshold density limit can be increased by driving current in the plasma edge counter to the magnetic field. {copyright} {ital 1996 American Institute of Physics.}

• OSTI ID: 286353
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 3; ISSN 1070-664X; ISSN PHPAEN
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
INSTABILITY
PLASMA FLUID EQUATIONS
PLASMA HEATING
PLASMA IMPURITIES
ROTATING PLASMA
THERMAL CONDUCTION
THERMAL INSTABILITIES
TOKAMAK DEVICES
VISCOSITY