Organized structeres and reconnection of magnetic lines in DPF fusion plasma

The experimental research of fusion DD reaction was provided on the dense plasma focus (DPF) device at the current above 1 MA and the total neutron yield at the level of 1010. The multiframe interferometry and X-ray diagnostics imaged the evolution of toroidal and plasmoidal structures, formed by closed currents with poloidal and toroidal components. The spontaneous evolution starts by the dominant toroidal current, continues by increase of the poloidal component and finished by the dominant poloidal one. The transformations are realized by reconnection of magnetic lines, similarly as in tokamak and astrophysical1 or in laser produced fusion plasmas 2. The ordered structures in DPF are similar to the field reverse and spheromak-like configurations with confined plasma in which the pressure of the pinching current is equaled by the pressures of the compressed plasma and repulsive component of magnetic field. The neutron production of fusion neutrons correlates with the formation and decay of plasmoids. We present the estimation of the radial distribution of the poloidal and toroidal current, its filamentary form3 and the possible acceleration mechanism of fast particles at the release of the part of magnetic energy during reconnection.