Three-Dimensional Monte Carlo Calculations of Nuclear Heating in CIT and Comparisons with Results from Simpler Models

Abstract

In the Compact Ignition Tokamak (CIT), significant nuclear heating results from the neutron and γ interactions in structural components near the plasma and it affects their thermo-mechanical behaviors. Approximate nuclear heating distributions have previously been obtained with 2-D discrete ordinate models¹ and a simple formulation based on 3-D ray-tracing and 1-D discrete ordinate models². To reduce the geometric uncertainties in these calculations, we have constructed a set of detail 3-D Monte Carlo models for rigorous calculations. The results obtained from these models are used as benchmarks to evaluate the accuracy and relative merits of the simpler models.