Scaling laws for thermal beehavior of inertially cooled limiters allowing for temperature-dependent material properties

The use of temperature-averged thermophysical material properties allows fairly accurate (to within 20%) calculations of temperature rise and temperature distributions in inertially cooled parts of tokamaks. Thus the scaling laws derived for constant coefficients, as e.g. the scaling of permissible power load approx. equal to t - sup(1/2) remain valid even for materials with pronounced temperature dependence of thermophysical properties, provided cases with similar temperature sweep are compared. This is no longer true if radiated power at the end of the pulse exceeds 10% of the incident power, since then corrections for radiation cooling are important. (orig.)