Influence of plasma pressure gradient on melt layer macroscopic erosion of metal targets in disruption simulation experiments

Damage of target edges in brush-like geometry in the course of ELM-like plasma pulses in QSPA Kh-50

“…Experimental simulations of ITER transient events with relevant surface heat load parameters (energy density and the pulse duration) as well as particle loads were carried out with a quasi-stationary plasma accelerator QSPA Kh-50 [6,[9][10][11][12] that is largest and most powerful device of its kind. The main parameters of the hydrogen plasma streams are as follows: ion impact energy about 0.4 keV, maximum plasma pressure 0.32 MPa, and the stream diameter 18 cm.…”

Damage to preheated tungsten targets after multiple plasma impacts simulating ITER ELMs

“…The repetitive plasma exposures have been performed using the QSPA Kh-50 [9][10][11]. Tungsten targets of EU trademark have the sizes 5 Â 5 Â 1 cm.…”

Erosion of materials under the effect of compression plasma flows

“…Thus, the amount of melt removed by the running flow from the sample surface should change. Similar ideas about the mechanism of removal of mass from the region of the plasma spot are considered in [3].…”

“…The origin of this process depending on type of flow, its power, and pulse duration can be the appearance of the shock waves [1], ablation [2], hydrodynamic flow of melt [3], etc. Under the action of flows with a specific power higher than 10 6 W/cm 2 with the pulse duration of ~10 μs and more (when shock waves do not develop) on metals, one of the main causes of erosion is ablation, i.e., the transition of the material into the vapor-plasma state appearing because of the sharp heating of the material in the sur face layer [2,4].…”