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Picker, S. Ahmed, S. Hansen-Romu, S. Kawasaki, S. Page, S. Sidhu, S. Vanbergen, T. Andalib, T. Hayamizu, T. Kikawa, T. Lindner, T. Momose, T. Okamura, W. D. Ramsay, W. Klassen, W. Schreyer, W. T. H. van Oers, Y. Makida, Y. X. Watanabe","submitted_at":"2018-09-11T00:13:34Z","abstract_excerpt":"We installed a source for ultracold neutrons at a new, dedicated spallation target at TRIUMF. The source was originally developed in Japan and uses a superfluid-helium converter cooled to 0.9$\\,$K. During an extensive test campaign in November 2017, we extracted up to 325000 ultracold neutrons after a one-minute irradiation of the target, over three times more than previously achieved with this source. The corresponding ultracold-neutron density in the whole production and guide volume is 5.3$\\,$cm$^{-3}$. 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