Ion acoustic peregrine soliton under enhanced dissipation

The understanding of the physics of rogue waves in plasma has become a hot topic because of its fundamental characteristics and complex process of formation. D. H. Peregrine furnished the mathematical formulation of Peregrine soliton or the so called rogue waves from the framework of nonlinear Schrödinger equation. The basic characteristics of a Peregrine soliton is that it is localized both in space and time and the maximum wave height is of ~ 3 times that of the background wave height. The first experimental observation of Peregrine soliton was reported in fiber optics, soon after that in water and in multicomponent plasma. The experimental observations of super rogue waves and the multi-Peregrine soliton in multidipole plasma have also been reported. Landau damping is omnipresent in ion acoustic wave experiments in multidipole plasma devices. Recently theoretical works on the effect of dissipation on solitary waves like envelope soliton and rogue waves have also been attempted. In the present experiment, we have investigated the effect of the enhanced Landau damping on the evolution of ion acoustic Peregrine soliton. The experiment is carried out in a double plasma device. The Peregrine soliton is first excited in multicomponent plasma and to observe the effect of the Landau damping, the ion temperature is increased by applying a continuous sinusoidal signal of frequency close to the ion plasma frequency ~1 MHz to the grid. Initially when amplitude of the high frequency (HF) signal is small, the amplitude of the Peregrine soliton increases. For higher HF value, the amplitude of the soliton decreases and disappear at a certain point. Our results demonstrate the effect of enhanced dissipation i.e. Landau damping on the properties of Peregrine soliton. (author)