Structural Transformations Of Pinched Column In Plasma Focus Device

Summary form only given. The experimental research of fusion DD reaction was provided on the plasma focus device PF-1000 in IPPLM in Warsaw, Poland at the current of 2 MA. The multiframe interferometry diagnostics showed existence of the dense internal structures of spherical-, toroidal-, helical- and disclike forms in the column. The magnetic probe measurements enabled to combine these structures with internal poloidal and toroidal magnetic fields. The neutron diagnostics with temporal resolution made possible to correlate the neutron production with the evolution of the plasmoids and constrictions. These transformations can be interpreted by the scenario of closed internal poloidal and toroidal currents ¹ . In this contribution we present evolution of some lobules, top of which returns back to the dense column. We elucidated this arcade on the base of the existence of the poloidal and toroidal closed currents outside the dense pinched column. These loops transport the discharge current to the higher distance from the column and their magnetic field is a reservoir of the magnetic energy which can be released at the acceleration of the fast particles.