Tuesday 8
F. Environmental and Medical Applications
Chair: S. Starikoskaia - Each talk is 10'+2' duration
› 16:45 - 17:00 (15min)
› Blaise
Modulation of ionization front propagation velocity in a µs plasma gun helium discharge with nitrogen admixture
Thibault Darny  1@  , Eric Robert  1@  , Sebastien Dozias  1@  , Jean-Michel Pouvesle  1@  
1 : Groupe de recherches sur l'énergétique des milieux ionisés  (GREMI)  -  Website
CNRS : UMR7344, Université d'Orléans
14 Rue d'Issoudun - BP 6744 45067 ORLEANS CEDEX 2 -  France

The propagation velocity modification of μs helium plasma gun (PG) discharge with nitrogen gas admixture in the helium buffer is studied in relation with ionization front imaging and helium-nitrogen plasma features. From 0,1 % to 0,8 % of N2, the ionization front is faster, more extended and with strong luminous intensity, compared to the high purity helium. The velocity has an optimum, for approximately 0,3 % of N2. Above 0,3 %, the velocity is progressively slowing down, and finally gets slower than the pure helium case above 0,9 %. The velocity evolution may be linked with kinetic and energy transfer predominantly on N2+ or N2 according to the increase of N2 %. Consequently, a local reinforcement of electric field in the front of the discharge is suspected for low N2 percentage, involving velocity increase of the discharge.


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