RF source for shock free plasma application on living skin

In this work, a shock-free RF power supply circuit is developed for cold atmospheric plasma (CAP) jet. The plasma discharge characteristics are investigated from the voltage and current waveforms at 100 kHz frequency. 100 kHz frequency offer better skin depth and that is essential to generate shock free plasma. The plasma plume (jet) temperature is measured where the Ar gas flow rate maintained at 7 sL/min. Several micro-discharges are observed in the plasma plume region. Voluntarily one of the co-authors himself applied this discharge plume on his finger without anesthesia to check the immediate effect of electrical shock and the post irradiation effect.