Nonlinear saturation of curvature induced low-frequency instability

Analytical analysis of the nonlinear saturation of the Rayleigh--Taylor (R--T) instability has been carried out and an appropriate physical model has been proposed for the saturation mechanism. Stationary wave formalism and initial value approach have been applied for the analysis. In the former case, a linear superposition model has been forwarded to understand the nonlinear saturation process, whereas in the latter, the mode--mode coupling model. Parallel friction due to shear effect and ion polarization drift are identified as the basic sources of the nonlinearity. Utility of the results in laboratory plasmas are highlighted