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Using polycrystalline bismuth filter in an ultracold neutron source with superfluid helium

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Abstract

Placing polycrystalline bismuth filter in front of an ultracold neutron (UCN) source with superfluid helium at 1 K is shown to be effective. The use of this filter ensures a 30-fold decrease (down to 0.5 W) in the level of heat load in the UCN source, while reducing by 30% the flux of neutrons with 9-Å wavelength (which are converted into UCNs). The phenomenon of small-angle scattering on polycrystalline bismuth has been studied and shown to be insignificant. Cooling of the filter to liquid nitrogen temperature increases the transmission of 9-Å neutrons by only 8%; hence, creation of this cooling system is inexpedient. A project of a technological complex designed for the UCN source at the PIK reactor is presented, which ensures the removal of 1-W heat load from the UCN source with superfluid helium at a 1-K temperature level.

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Authors and Affiliations

  1. Petersburg Nuclear Physics Institute, National Research Centre “Kurchatov Institute”, Gatchina, Leningrad oblast, 188300, Russia

    A. P. Serebrov, V. A. Lyamkin, V. V. Runov, S. A. Ivanov, M. S. Onegin & A. K. Fomin

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  1. A. P. Serebrov
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  2. V. A. Lyamkin
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  3. V. V. Runov
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  4. S. A. Ivanov
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  5. M. S. Onegin
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  6. A. K. Fomin
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Correspondence to A. P. Serebrov.

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Original Russian Text © A.P. Serebrov, V.A. Lyamkin, V.V. Runov, S.A. Ivanov, M.S. Onegin, A.K. Fomin, 2015, published in Pis’ma v Zhurnal Tekhnicheskoi Fiziki, 2015, Vol. 41, No. 20, pp. 96–102.

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Serebrov, A.P., Lyamkin, V.A., Runov, V.V. et al. Using polycrystalline bismuth filter in an ultracold neutron source with superfluid helium. Tech. Phys. Lett. 41, 1016–1018 (2015). https://doi.org/10.1134/S1063785015100284

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  • DOI: https://doi.org/10.1134/S1063785015100284

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