A full-scale superthermal helium ultracold neutron source at the ILL achieved a record stored in-situ density of 273 cm^-3 and continuous extraction of 21,000 s^-1.
A superfluid helium converter for accumulation and extraction of ultracold neutrons
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abstract
We report the first successful extraction of accumulated ultracold neutrons (UCN) from a converter of superfluid helium, in which they were produced by downscattering neutrons of a cold beam from the Munich research reactor. Windowless UCN extraction is performed in vertical direction through a mechanical cold valve. This prototype of a versatile UCN source is comprised of a novel cryostat designed to keep the source portable and to allow for rapid cooldown. We measured time constants for UCN storage and extraction into a detector at room temperature, with the converter held at various temperatures between 0.7 and 1.3 K. The UCN production rate inferred from the count rate of extracted UCN is close to the theoretical expectation.
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High-Density Ultracold Neutron Source for Low-Energy Particle Physics Experiments
A full-scale superthermal helium ultracold neutron source at the ILL achieved a record stored in-situ density of 273 cm^-3 and continuous extraction of 21,000 s^-1.