Influence of energy deposition mode on plasma bullets development

Plasma bullet obtained mainly in Ar and He are of growing interest especially for biomedical application. The role of capillary tube surface in the bullet sustainment is still not well understood. In this work, the minimum energy density required to start a bullet is studied for different tube diameter, with several type of high voltage sources. The simultaneous measurement of charge deposition and fast imaging gives an insight on the role of charge adsorption for this kind of propagating mechanism. Molecular gases are also investigated with N2/O2 mixture diluted into Ar, especially for exhibiting the role of attachment on O$_{2}$ as a barrier for bullet development.