Neutronics Scaling in Fusion Test Devices^a

A scaling factor for the neutronics parameters of the first wall was derived as a function of the plasma and first wall radii of fusion devices based on the simple albedo concept. The derived equation followed very well the scaling behavior of the heating rate and DPA obtained by ANISN as the device size was changed. The helium and hydrogen production rates were scaled with the rate φ^uncol/J^uncol. A simple expression for the azimuthal distribution of neutronics parameters in the first wall was derived. The applicability of the expression was verified by comparing the heating rate profiles given by the equation with those by Monte Carlo calculations in the first two different shapes.