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<p>Real time discharge dynamics in a pulse-driven cold atmospheric pressure plasma (CAP) device has been probed directly via ultra-high-speed imaging (480000 frames per second). CAP is driven by a variable frequency power source in the kHz range.While a detailed analysis of the discharge mechanism has been presented for 17&#xa0;kHz, the key features of the discharges have also been presented at higher excitation frequencies (30&#xa0;kHz, and 60&#xa0;kHz). Observed charge buildup forming apparently stable strange structures in the discharge zone has been probed further by numerically subtracting the intensities of the consecutive images. Some of the novel mechanisms explored include specific stepwise buildup of ion density in the discharge zone leading to massive breakdown (avalanche), increased emission of secondary electrons via auto-enhanced ion accelerating voltages, reduction in potential through depletion of the ion cloud via recombination at higher frequencies, formation of strange but apparently stable discharge structures in the discharge zone, and oscillating electron current followed by relatively prolonged steady ion current after collection of the electrons. Measured steady electron current for few microseconds, immediately after the avalanche allowed a rough estimation of the electron density and electron mobility, which corroborate fairly well with the values reported in literature.</p>

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Evolution of Discharge Dynamics in Non-DBD Excitation Frequency Controlled Cold Atmospheric Pressure Plasma (EFCAP) Device

  • 期刊论文

  • 发表日期：

    2026年7月31日

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  • Nirupama Tiwari,
  • Vandana Chaturvedi Misra,
  • Srikumar Ghorui

摘要

Real time discharge dynamics in a pulse-driven cold atmospheric pressure plasma (CAP) device has been probed directly via ultra-high-speed imaging (480000 frames per second). CAP is driven by a variable frequency power source in the kHz range.While a detailed analysis of the discharge mechanism has been presented for 17 kHz, the key features of the discharges have also been presented at higher excitation frequencies (30 kHz, and 60 kHz). Observed charge buildup forming apparently stable strange structures in the discharge zone has been probed further by numerically subtracting the intensities of the consecutive images. Some of the novel mechanisms explored include specific stepwise buildup of ion density in the discharge zone leading to massive breakdown (avalanche), increased emission of secondary electrons via auto-enhanced ion accelerating voltages, reduction in potential through depletion of the ion cloud via recombination at higher frequencies, formation of strange but apparently stable discharge structures in the discharge zone, and oscillating electron current followed by relatively prolonged steady ion current after collection of the electrons. Measured steady electron current for few microseconds, immediately after the avalanche allowed a rough estimation of the electron density and electron mobility, which corroborate fairly well with the values reported in literature.