Investigation of Diffusion Processes at Metal Target Irradiation by Pulsed Plasma Flow

Pulsed irradiation of metals and alloys by plasma flows and ion beams follows by an emergence of significant temperature gradients and thermo mechanical stresses in near-surface region of a target [1-3]. Processes of heat and mass transfer are intensified. Diffusion is stimulated by temperature growth. Diffusion coefficients are increased on 5-8 orders of magnitude in compare with their stable values, corresponding to the irradiation in continuous regime. A depth of impurity particles penetration doesn’t exceed the value of projectile path length in metals. At deceleration of the impurity particles their collisions with atoms nuclei cause atoms displacement of crystal lattice sites. Because of medium continuity a dominant mechanism of structural damages creation could be atom-atomic collisions cascades, which involve large area, several times exceeding a volume of near-surface region of the target. It is obvious, that the large part of diffusion flow is transferred within displacement cascades [1]..

Investigation of Diffusion Processes at Metal Target Irradiation by Pulsed Plasma Flow

Pulsed irradiation of metals and alloys by plasma flows and ion beams follows by an emergence of significant temperature gradients and thermo mechanical stresses in near-surface region of a target [1-3]. Processes of heat and mass transfer are intensified. Diffusion is stimulated by temperature growth. Diffusion coefficients are increased on 5-8 orders of magnitude in compare with their stable values, corresponding to the irradiation in continuous regime. A depth of impurity particles penetration doesn’t exceed the value of projectile path length in metals. At deceleration of the impurity particles their collisions with atoms nuclei cause atoms displacement of crystal lattice sites. Because of medium continuity a dominant mechanism of structural damages creation could be atom-atomic collisions cascades, which involve large area, several times exceeding a volume of near-surface region of the target. It is obvious, that the large part of diffusion flow is transferred within displacement cascades [1]..

The calculation of parameters and designe of «Plasma focus» facility

In this paper, the plasma focus type devices are seen as an alternative to traditional magnetic systems and laser fusion. The authors present the researches results of plasma formation on the ”CPA-30” plasma accelerator and plasma installation “Focus fusion”..

The calculation of parameters and designe of «Plasma focus» facility

In this paper, the plasma focus type devices are seen as an alternative to traditional magnetic systems and laser fusion. The authors present the researches results of plasma formation on the ”CPA-30” plasma accelerator and plasma installation “Focus fusion”..

The plasma parameters and neutron yield at device of "Plasma focus"

Present work presents calculations and experimental studies on the formation and dynamics of plasma on the “plasma focus” set up. Physical conditions were determined and critical parameters were calculated for estimating the neutron yield for kilojoule and megajoule set ups. The results of plasma diagnostics and flow formation in the CPA-30 and PF-4 set ups are also shown. A comparison of calculated data and experimental values is performed. The value of the neutron yield parameter is justified and the possible cause of the appearance of saturation is indicated. The rationale for the development of further research in the direction of creating conditions for thermonuclear fusion in installations of the plasma focus type is given. The neutron flux was observed on high-voltage gas discharges with a specific geometry of the electrodes. The result of measuring the anisotropy of the neutron yield along the axial z and radial φ directions was equal to Yn(z)/Yn(φ)~ 2 ÷ 3, which contradicts the thermonuclear mechanism

The plasma parameters and neutron yield at device of "Plasma focus"

Present work presents calculations and experimental studies on the formation and dynamics of plasma onthe “plasma focus” set up. Physical conditions were determined and critical parameters were calculatedfor estimating the neutron yield for kilojoule and megajoule set ups. The results of plasma diagnostics andflow formation in the CPA-30 and PF-4 set ups are also shown. A comparison of calculated data andexperimental values is performed. The value of the neutron yield parameter is justified and the possiblecause of the appearance of saturation is indicated. The rationale for the development of further research inthe direction of creating conditions for thermonuclear fusion in installations of the plasma focus type isgiven. The neutron flux was observed on high-voltage gas discharges with a specific geometry of theelectrodes. The result of measuring the anisotropy of the neutron yield along the axial z and radial φdirections was equal to Yn(z)/Yn(φ)~ 2 ÷ 3, which contradicts the thermonuclear mechanism