Compression of puffing deuterium by neon plasma sheath on plasma focus device

Summary form only given. The experimental research of fusion DD reaction was provided on the plasma focus device at the current of 2 MA in the approach with the MagLIF conception. The deuterium injected from the gas-puff in the axis of the anode and compressed by neon plasma sheath was studied with the multiframe x-ray and interferometry diagnostics. The total neutron yield at the level of 10¹⁰ - 10¹¹ per shot was registered at the compression of about 7 μg/cm of the deuterium from the gas-puff by about 23 μg/cm of the neon plasma sheath. The addition of the puffing deuterium to the filling neon in the chamber decreased the soft X-ray emission about two orders. This decrease can be explained by the absence of the neon and the presence of the deuterium in the central structures during their formation and transformation. The separation of both gases should be caused by internal closed currents magnetizing the plasma. The neutrons were produced both at the initial phase of stagnation, as well as at a later time in the evolution of instabilities.The XUV frames at the puffing deuterium and deuterium or neon filling showed the fine structures - filaments, spots and little balls. The spots are interpreted as the local concentration of the current and the short filaments as the path through which these currents are transported into the internal plasmoidal structures. The fine structures give evidence of the discrete structure of the current inside and outside the dense column. In several shots, the external poloidal magnetic field of tens of mT was applied in the pinch region and its influence on the internal structures and neutron production is reported.