Superfluid-helium ultracold neutron sources: concepts for the European Spallation Source?

摘要

Production of ultracold neutrons by conversion of cold neutrons in superfluid helium can be implemented in several ways, with the converter located either "in-pile" close to the core of a nuclear reactor or closely coupled to a neutron spallation source, or at the end of a neutron guide. This paper shall contribute to a discussion about source concepts for the ESS.