Plasma dynamics in different kinds of experiments at megaampere range on S-300 machine

This article presents experiments on a high-current magnetically insulated transmission line (MITL) and a mega-ampere X-pinch. It was shown that the time during which a MITL preserves its transmission properties at high linear current densities (5-7 MA/cm) corresponds to the requirements of the conceptual fusion reactor. The traditional X-pinch dynamics existence at electrical currents 1.3-2.3 MA has also been demonstrated together with the applicability of the main dynamic features (linear mass-current scaling, in particular) for considerably lower currents. It has been shown that the forming plasma object has the radiation luminosity higher than 10¹⁵ W/(cm²sr) in a photon energy range of 1-3 keV, the size of the hot spot ~20 μm, and the radiation power ~120 GW; these parameters are several times higher than the values obtained previously. The energy emitted by the molybdenum X-pinch in the range of 2.5-3 keV was shown to be no less than 15 J.