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Neutronic Design Calculations on Moderators for the Spallation Neutron Source (SNS)

By D.B. Murphy

Abstract

The Spallation Neutron Source (SNS) to be built at the Oak Ridge National Laboratory will provide an intense source of neutrons for a large variety of experiments. It consists of a high-energy (1-GeV) and high-power ({approximately}1-MW) proton accelerator, an accumulator ring, together with a target station and an experimental area. In the target itself, the proton beam will produce neutrons via the spallation process and these will be converted to low-energy (<2-eV) neutrons in moderators located close to the target. Current plans are to have two liquid-hydrogen (20-K) moderators and two room-temperature H{sub 2}O moderators. Extensive engineering design work has been conducted on the moderator vessels. For our studies we have produced realistic neutronic representations of these moderators. We report on neutronic studies conducted on these representations of the moderators using Monte Carlo simulation techniques

Topics: Computerized Simulation Spallation Neutron Source, Spallation Neutron Source, 43 Particle Accelerators, Spallation, Cryogenic Fluids, Ornl, Monte Carlo Method, Moderators, Design, Proton Beams, Hydrogen, Neutron Sources
Publisher: Oak Ridge National Laboratory
Year: 1999
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Provided by: UNT Digital Library
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