Abstract
A number of SS-316 right circular cylindrical shells of varying lengths have been analyzed using two-dimensional discrete ordinates transport methods together with first and last flight particle estimators to aid in the design of neutron collimators for the Tokamak Fusion Test Reactor. In the TFTR the 14-MeV neutron source has a very large spatial extent and the collimators must be designed to allow spectral measurements that refer to only a small spatial region of this extended source. The analysis identifies the 14-MeV neutrons from scattering in the SS-316 immediately adjacent to the collimator opening as the dominant contributor to detector background. Collimator lengths greater than 0.60 m were found sufficient to attenuate uncollided background neutrons for reasonable source-detector distances. The lower energy (less than 13.8 MeV) neutron background and gamma background were not found to be significant.
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