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Communication Dans Un Congrès Année : 2015

Experimental and numerical study of the dynamics of a μs helium plasma gun discharge with various amounts of N2 admixture

Résumé

These last years, atmospheric pressure plasma jets formed by pulsed helium discharges ignited in thin dielectric tubes have been extensively studied due to their potential for biomedical applications. So far, most experiments have been dedicated to the study of the plasma plume. For endoscopic treatments, it is also important to better understand and optimize the propagation of discharges in long dielectric tubes as catheters. First we present an experimental and numerical study on the dynamics of a s helium plasma discharge with N2 admixture in a long dielectric tube. We compare the velocity of the discharge front for various amounts of N2 and di erent applied voltages and show a good agreement between experiments and simulations. Second, we compare time-resolved measurements and simulations of longitudinal and radial electric elds associated with plasma propagation in the dielectric tube and in the plasma plume. It is interesting to note that measurements obtained with a probe located outside the dielectric tube are in excellent agreement with simulations. This allows to infer from simulations the time evolution of the electric eld on the discharge axis which is a key parameter for applications. Acknowledgment: The authors acknowledge the computational resources of the Mesocentre of Ecole Centrale Paris.
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Dates et versions

hal-01258113 , version 1 (18-01-2016)

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  • HAL Id : hal-01258113 , version 1

Citer

Anne Bourdon, Pedro Viegas, Thibault Darny, Eric Robert, Jean-Michel Pouvesle, et al.. Experimental and numerical study of the dynamics of a μs helium plasma gun discharge with various amounts of N2 admixture. 68th Annual Gaseous Electronic Coference GEC, APS, Oct 2015, Honolulu, United States. http://meetings.aps.org/link/BAPS.2015.GEC.NR1.3. ⟨hal-01258113⟩
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