Calculation of neutron and γ production and transport for the Alcator C-Mod experiment

Deuterium operation in the Alcator C-Mod is expected to produce up to 1×10¹⁶ neutrons/s during high-performance pulses (1 s duration) with full RF power (6 MW). Neutron production during optimized ohmic operation should reach 1×10¹⁵ neutrons/s. Energy resolved neutron transport calculations have been made for Alcator C-Mod, using both the one-dimensional ANISN code (for deep penetration and activation calculations) and the three-dimensional MCNP (Monte Carlo neutron-photon) code (for wall penetrations and near-machine calculations). The results are used to assess the extent of radiation-related health risks imposed by the experiment (anticipated dose rates due to direct radiation exposure, material activation, and airborne activity), and to establish the efficacy of the biological shielding surrounding the experimental cell. The calculations are used to determine the necessary monitoring and access control for the experiment, and to optimize the design of an igloo structure which will enclose the tokamak