Abstract
The interaction of kHz μs-pulsed atmospheric pressure He jets with metallic targets is studied through simulations and experiments, focusing on the differences between floating and grounded targets. It is shown that the electric potential of the floating target is close to grounded in the instants after the impact of the discharge, but rises to a high voltage, potentially more than half of the applied voltage, at the end of the 1 μs pulse. As a result, a return stroke takes place after the discharge impact with both grounded and floating targets, as a redistribution between the high voltage electrode and the low voltage target. Electric field, electron temperature and electron density in the plasma plume are higher during the pulse with grounded target than with floating target, as gradients of electric potential progressively dissipate in the latter case. Finally, at the fall of the pulse, another electrical redistribution takes place, with higher intensity with the highly-charged floating target than with the grounded target. It is shown that this phenomenon can lead to an increase in electric field, electron temperature and electron density in the plume with floating target.
Highlights
We have found an excellent agreement with experiments on the electric field evolution inside the target, which is closely related to surface charge, for both charging and uncharging of the target
This work has addressed the interaction of kHz μs-pulsed atmospheric pressure He jets with metallic targets through simulations and experiments, focusing on the differences between floating and grounded targets
Three jet configurations have been studied with positive polarity of applied voltage: free jet, jet with metallic target at floating potential and jet with grounded metallic target
Summary
Plasma jets are very useful tools for the study of those interactions, as they are able to repetitively deliver in remote locations a wide range of reactive and charged species, high electric fields and UV photons, at atmospheric pressure and while keeping low gas temperature. They are very promising devices for applications in the areas of material science, biomedicine (Collet et al 2014, Laroussi 2015) and agriculture (Ito et al 2018). Plasma jets have attracted a lot of attention in the past 20 years and are generally described in several reviews (Schutze et al 1998, Laimer and Stori 2007, Laroussi and Akan 2007, Lu et al 2012, 2014, Winter et al 2015, Reuter et al 2018)
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