Excitation of helical shape argon atmospheric pressure plasma jet using RF pulse modulation

The article reports the excitation of a helical argon atmospheric pressure plasma jet using pulse-modulated 13.56 MHz radio frequency (RF) power source. This structure is observed in open ambient air, which far different from conventional conical shape. originates due to periodic variation discharge region caused by RF (2 kHz modulation frequency) and propagates downstream into air. geometrical characteristics are explored optical imaging. Moreover, influence various input parameters, viz., duty cycle, gas flow rate, power, modulated pulse on formation studied. These structures have an implication chemical features (enhancement reactive oxygen nitrogen species) as these involved increase air entrainment ionization desired for applications.