Radiation damage calculations for Ignitor components

Abstract

Ignitor is a proposed high magnetic field tokamak aimed at reaching ignition conditions in a deuterium-tritium plasma and at studying the physics of an ignited plasma for a period of a few seconds. Calculations of neutron and gamma fluxes have been performed using ANISN and MCNP codes. Particular attention was paid to the zones closest to the plasma and to the components most liable to be affected by radiation damage. Given the calculated gamma and neutron fluxes, the integrated doses have been computed using the SHAMSI library. Neutron damage on the first wall and vacuum vessel is very small in terms of total dpa and gas production. Due to the low fluence, Ignitor components appear to have no problems of neutron damage. The toroidal magnet insulator is the only material for which the estimated damage is comparable with the maximum limit.