Hydrodynamic eects of eroded materials of plasma-facing component during a Tokamak disruption
نویسندگان
چکیده
Loss of plasma con®nement causes surface and structural damage to plasma-facing materials (PFMs) and remains a major obstacle for tokamak reactors. The deposited plasma energy results in surface erosion and structural failure. The surface erosion consists of vaporization, spallation, and liquid splatter of metallic materials, while the structural damage includes large temperature increases in structural materials and at the interfaces between surface coatings and structural members. Comprehensive models (contained in the HEIGHTS computer simulation package) are being used self-consistently to evaluate material damage. Splashing mechanisms occur as a result of volume bubble boiling and liquid hydrodynamic instabilities and brittle destruction mechanisms of nonmelting materials. The eect of macroscopic erosion on total mass losses and lifetime is evaluated. The macroscopic erosion products may further protect PFMs from severe erosion (via the droplet-shielding eect) in a manner similar to that of the vapor-shielding concept. Ó 2000 Elsevier Science B.V. All rights reserved.
منابع مشابه
Hydrodynamic Effects of Eroded Materials on Response of Plasma-Fachg Component during a Tokamak Disruption*
Loss of plasma co@nement causes surface and structural damage to plasma-facing materials (PFMs) and remains a major obstacle for tokamak reactors. The deposited plasma energy results in surface erosion and structural failure. The surface erosion consists of vaporization, spallation, and liquid splatter of metallic materials, while the structural damage includes large temperature increases in st...
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