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Experimental and theoretical investigations of particle beam and plasma stream target interaction

The electron beam facilities GOL-3 and GOL-3II at Novosibirsk and the plasma gun facility MK-200 UG ant TRINITI Troitsk have been used for hot plasma surface interaction experiments. In the experiments at the GOL-3 facilities emphasis was put on the analysis of macroscopic erosion, on characterization of carbon dusty particles produced during macroscopic erosion of graphite and on numerical modelling of macroscopic erosion. By use of an empirical threshold value of specific energy for material damage and volumetric energy deposition into the bulk target by hot electrons the calculated values of macroscopic erosion were in good agreement with the measurement. The triggering mechanism for macroscopic erosion is supposed to be either a phase transition inside of the bulk target or crack formation by thermal stress.

In hot plasma target experiments at TRINITI Troitsk emphasis was put on analysis of physical properties of plasma shields, on determination of the 2 dim MHD behaviour of the plasma shield, in quantification of lateral leakage radiation intensities from plasma shields and on a first investigation of ExB drift effects in hot plasma cold target plasma interaction. Theoretical activities were performed in modelling of ExB drift effects and in numerical simulation of brittle destruction of graphite under pulsed heat loads produced by impact of hot plasma.

At the Luikov Institute in Minsk the optical properties of multichanged tungsten plasmas were calculated using the collisional radiative equilibrium (CRE) model. Multigroup opacities for tungsten were produced using the Lebesgue averaging procedure which takes into account the correct statistical weight of individual lines.

For theoretical modelling of the hot plasma target interaction the 2 dim radiation magnetohydrodynamics code FOREV-2 developed at FZK was improved by implementation of a 2 dim numerical scheme for calculation of angular dependent radiation fluxes supplied by Luikov Minsk and by a consistent solution of the magnetic field equations in the bulk target and the plasma shield supplied by TRINITI Troitsk. Validation of FOREV-2 against results from experiments at the Troitsk facilities was systematically performed. The validation activities demonstrated that FOREV-2 adequately describes the physical properties of plasma shields, the short term MHD motion of the plasma shield and side wall erosion due to radiation from the evolving plasma shield.

Reported by

Kernforschungszentrum Karlsruhe
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