Collisional and anomalous diffusion of a weakly ionized plasma in a cylinder with conducting walls. 2

Conditions were investigated when a plasma became instable while decaying in a cylindrical container with conducting walls in uniform mgnetic field H. The destabilizing factors were: the misalighment of the discharge container axis (OZ) with respect to the direction H, and also the takeoff of electron current to a probe or supplying pulse voltage on the probe. To investigate the effect of the misalignment on a diffusion, the cathode end of the experimental instrument was fixed with respect to a solenoid yoke and the anode end was displaced in the plane perpendicular to H at a distance Δx < or approximately 10 mm relative to the adjusted position (Δx = 1 mm corresponds to an angle α approximately 4'). The instrument was adjusted by the maximum of a critical field Hsub(k). The pressure of helium was 0.1 mm Hg. The magnetic field changed to 3.5 kOe. The plasma was found to be most stable with respect to disturbing factors in magnetic fields where the ion collision frequency was comparable with cyclotron frequency (Ωsub(i)/νsub(ia) approximately 1.5). When the misalignment increased in strong magnetic fields (Ωsub(i)/νsub(i) > 1) a plasma stabilization was observed during some time (up to 100 mcs) in areas near walls. It was also established that at later decay stages the 'short circuit effect' which might be realized near the side walls of the cylinder during the misalignment did not cause a notable increase of the rate of charged particles elimination from the areas