Penetration of a supersonic particle at the interface in a binary complex plasma

Area of Science:

• Plasma physics
• Complex plasma dynamics
• Interfacial phenomena

Background:

• Studies on supersonic particle interactions in plasmas are crucial for understanding wave phenomena.
• Experiments on the International Space Station (ISS) provide unique environments for plasma research.
• Complex plasmas exhibit unique behaviors due to the presence of charged microparticles.

Purpose of the Study:

• To investigate the dynamics of a supersonic particle penetrating an interface in a binary complex plasma.
• To analyze the formation and characteristics of the resulting wave structures.
• To understand the factors influencing the propagation and decay of interfacial perturbations.

Main Methods:

• Langevin dynamics simulations were employed to model the particle interactions.
• The simulations were inspired by experiments conducted in the PK-3 Plus Laboratory on the ISS.
• Analysis focused on the evolution of particle velocities and wave structures.

Main Results:

• A Mach cone structure was observed behind the supersonic particle.
• The kink of the Mach cone flanks was localized at the interface.
• Pulse-like perturbations propagated along the interface, with their decay determined by friction.

Conclusions:

• The study demonstrates the propagation of interfacial perturbations driven by supersonic particle penetration.
• Friction plays a key role in the decay and propagation distance of these perturbations.
• Disparities in particle mobility may underlie various interfacial effects in complex plasmas.