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The ultracold neutron (UCN) source at Los Alamos National Laboratory (LANL),which uses solid deuterium as the UCN converter and is driven by acceleratorspallation neutrons, has been successfully operated for over 10 years,providing UCN to various experiments, as the first production UCN source basedon the superthermal process. It has recently undergone a major upgrade. Thispaper describes the design and performance of the upgraded LANL UCN source.Measurements of the cold neutron spectrum and UCN density are presented andcompared to Monte Carlo predictions. The source is shown to perform as modeled.The UCN density measured at the exit of the biological shield was $184(32)$UCN/cm$^3$, a four-fold increase from the highest previously reported. Thepolarized UCN density stored in an external chamber was measured to be $39(7)$UCN/cm$^3$, which is sufficient to perform an experiment to search for thenonzero neutron electric dipole moment with a one-standard-deviationsensitivity of $\sigma(d_n) = 3\times 10^{-27}$ $e\cdot$cm.

physical review. c

Performance of the upgraded ultracold neutron source at Los Alamos  National Laboratory and its implication for a possible neutron electric  dipole moment experiment