Spatiotemporal filamentary patterns in a dc-driven planar gas discharge system

Area of Science:

• Physics
• Plasma Physics
• Nonlinear Dynamics

Background:

• Homogeneous stationary states in dc-driven gas discharges are susceptible to destabilization.
• Current filaments, characterized by localized gas breakdowns, can form and evolve within these systems.
• The behavior of these filaments, including their creation, quenching, and spatial arrangement, is influenced by system parameters.

Purpose of the Study:

• To investigate the destabilization of a homogeneous stationary discharge state in a dc-driven planar gas discharge system with a semiconductor electrode.
• To characterize the formation, dynamics, and spatial configurations of current filaments.
• To explore the underlying mechanisms, potentially a Hopf-Turing instability, responsible for the observed phenomena.

Main Methods:

• Utilizing a dc-driven planar gas discharge system equipped with a semiconductor electrode.
• Observing and analyzing the behavior of current filaments, including their creation, quenching, and movement.
• Examining the spatial density and configurations of filaments under varying control parameters.

Main Results:

• The homogeneous stationary discharge state is destabilized, leading to the formation of current filaments.
• Filaments exhibit pulsating behavior, slowly moving across the active area.
• At intermediate densities, filaments form a spatially anisotropic chain pattern with two characteristic scales.
• Filament density influences their arrangement into distinct configurations.

Conclusions:

• The observed phenomena, including filament formation and spatial patterning, are likely driven by a Hopf-Turing instability.
• The study reveals complex nonlinear dynamics in gas discharge systems with semiconductor electrodes.
• Filament density is a critical parameter controlling the emergent spatial structures.