Instability control in microwave-frequency microplasma

摘要: Atmospheric argon microplasmas driven by 1.0 GHz power were studied microwave circuit analyses and spatially-resolved optical diagnostics. These studies illuminate the mechanisms responsible for microplasma stability. A split-ring resonator (SRR) source is demonstrated to reflect excess power, preventing ionization overheating instability while limiting electron density approximately 1 × 1014 cm−3 OH rotational temperature 760 K at 0.76 W. Providing SRR with an electrical path ground, however, allows transition from mode so-called transmission line (T-line). This due matching of impedances. The higher T-line supports a more intense 1015 1480 15 W absorbed power. While optimized ignition sustaining stable nonequilibrium plasma, better suited driving hot, high microplasma. estimated discharge voltages V 35 in mode, respectively, are rather independent input Microplasma stability combination impedance mismatching direct control both inherent circuitry.