A 10-cm long filamentary discharge produced in helium spiral vortex

Hong-Yu Chu^1*

¹Department of Physics, National Chung Cheng University, Chiayi, Taiwan

* Presenter:Hong-Yu Chu, email:phyhyc@ccu.edu.tw

We report the generation of long plasma filament confined in a helium spiral vortex at atmospheric pressure. The discharge is produced by a dielectric barrier discharge setup and confined in the center of spiral vortex. The length of the discharge can be several centimeters with flow rate less than 1 SLM. We find that the long filamentary discharge is the footprint of repeatedly fast-traveling plasma bursts and plasma plumes. The speeds of the downstream and upstream plasma bursts are about 46000 and 95000 m/s, respectively, which are affected by the spirally upward helium gas flow. Based on the novel design of vortex-confined discharge, we show that a plasma filament with length of 10 cm can be produced.

Keywords: Atmospheric pressure plasma, Long filamentary discharge, Spiral vortex