Dynamics of shock waves during optical breakdown in the plasma of a non-self-maintained dischargeстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The propagation of shock waves produced by a laser spark in a non-self-maintained discharge in electronegative (CO2) and electropositive (N2) gases is experimentally studied. A method is proposed for determining the characteristic dynamic length (i.e., the basic parameter in the problem of a point explosion) in which the pressure of the unperturbed background gas in the region in front of the shock wave (SW) is taken into account. The gas density profile in front of the SW front is determined on the basis of a comparison of interferometric data and the profiles obtained by numerically solving the problem of point explosion by taking into account the pressure of the unperturbed background gas. The shares of the energy spent on producing an SW in nitrogen and CC2 are determined. For different instants, the deviation of the shape of the SW front from the spherical is found. The basic mechanisms that can cause propagation of the plasma boundary toward the laser (which results in asymmetric evolution of the region occupied by the plasma) are discussed. It is shown that the breakdown wave is the main mechanism responsible for this effect.