Experimental study of radiation power flux on the target surface during high heat plasma irradiation

Some new data of the experimental study of visible radiation from the plasma shielding layer (SL) on the target surface during high heat plasma–material interaction are given in the report. The experiments were performed on the VIKA facility. Long pulse (τp=0.36 ms) high power (Pirr∼100 GW m−2 plasma streams were used for irradiation of graphite and tungsten samples. The target inclination (α=0° normal irradiation; 45°; 70°) and magnetic field (B=0 to 3 T) were varied in experiments. It is shown that the values of (Δλ≈400 to 700 nm) visible radiation power flux (VRPF) on the target surface can be characterised by the level of PR∼1 GW m−2 for normal irradiation in the presence of a magnetic field B=2 to 3 T. Inclination of targets leads to the reduction of this flux in conformity with the corresponding decrease of the irradiation power. The material of the target does not influence sufficiently on the level of the incident radiation power flux in the performed experiments.