Dynamic modeling of plasma - vapor interactions during plasma disruptions *

Intense deposition of energy in short times on fusion reactor components during a plasma disruption may cause severe surface erosion due to ablation of these components. The exact amount of the eroded material is very important to the reactor design and its lifetime. During the plasma deposition, the vaporized wall material will interact with the incoming plasma particles and may shield the rest of the wall from further damage. The vapor shielding may then prolong the lifetime of these components and increase the reactor duty cycle. To correctly evaluate the impact of vapor shielding effect a comprehensive model is developed. In this model the dynamic slowing down of the plasma particles, both ions and electrons, in the eroded wall material and the resulting interaction processes are established. The generated photons radiation source and the transport of this radiation through the vapor to the wall are modeled. Recent experimental data on disruptions is analyzed and compared with model predictions.