Toroidal curvature induced screening of external fields by a resistive plasma response

Journal Article · Sun Jul 15 04:00:00 EDT 2012 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4739062· OSTI ID:22072572

Yueqiang, Liu; Connor, J W; Cowley, S C; Ham, C J; Hastie, R J; Hender, T C ^[1]

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1. Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB (United Kingdom)

Within the single fluid theory for a toroidal, resistive plasma, the favorable average curvature effect [Glasser et al., Phys. Fluids 18, 875 (1975)], which is responsible for the strong stabilization of the classical tearing mode at finite pressure, can also introduce a strong screening effect to the externally applied resonant magnetic field. Contrary to conventional understanding, this screening, occurring at slow plasma rotation, is enhanced when decreasing the plasma flow speed. The plasma rotation frequency, below which this screening effect is observed, depends on the plasma pressure and resistivity. For the simple toroidal case considered here, the toroidal rotation frequency has to be below {approx}10{sup -5}{omega}{sub A}, with {omega}{sub A} being the Alfven frequency. In addition, the same curvature effect leads to enhanced toroidal coupling of poloidal Fourier harmonics inside the resistive layer, as well as reversing the sign of the electromagnetic torque at slow plasma flow.

• OSTI ID: 22072572
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 7 Vol. 19; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
FLOW RATE
FOURIER ANALYSIS
MAGNETIC FIELDS
PLASMA
PLASMA PRESSURE
PLASMA SIMULATION
ROTATION
SCREENING
TEARING INSTABILITY
TORQUE