Abstract
During routine operations, the National Ignition Facility (NIF) will attain fusion yields as high as 1200 MJ/yr with individual experiments reaching 20 MJ. Neutron activation of components within the NIF Target Bay will result in occupational doses that must be understood and limited to ≤ 10 person-rem/yr. Previous work has shown that the final optics assemblies (FOAs) are the key to worker doses. The present work gives results for three-dimensional analyses including dose rates and worker doses. Results for modified FOA designs are also presented. Finally, a concept for a polyethylene shielding plug is discussed and shown to substantially reduce occupational doses.
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