Abstract
The existence of striations in DBD - wave manifestation and oscillations of ionization - has long been an interesting topic, hampered in part by lack of empirical evidence. Striations are due to an alternation between regions of predominance of electron creation and regions of predominance of electron loss. This study gives a recent contribution to the existence of striations in a low pressure krypton plasma. Experimental analysis with an AC alternative current allowed us to distinguish two kinds of striations, mobile and immobile striations. In our case, the striations are formed one by one from the cathode towards the anode in a weak field channel. The formation of striations depends on the flow of modulated electrons. The photographies of emissions in this work were obtained by an intensified charge-coupled device (ICCD) camera with nanosecond exposure time. The manifestation of the striations was clearer at the naked eye and were more accurate with the camera. Spectroscopic and electrical measurements are also considered in this estimation in order to study the behavior of the discharge, the characteristics of the energy deposit and its luminous efficiency. Then the striations in the Krypton lamp draw our attention and allow us to better understand the inhomogeneous aspect of the discharge.
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