A two-dimensional model of He/O2 atmospheric pressure plasma needle discharge
Qian Mu-Yang†a), Yang Cong-Yinga), Chen Xiao-Changa), Liu San-Qiua), Yan Wenb), Liu Fu-Chengc), Wang De-Zhenb)
       
(a) Axial velocity of the streamer front as a function of time in the first 14 ns, (b) temporal variation of cathode sheath thickness at r = 0 mm radial position.