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

Autor:	V. A. Lyamkin, S. A. Ivanov, V. V. Runov, A. K. Fomin, M. S. Onegin, A. P. Serebrov
Rok vydání:	2015
Předmět:	Materials science Physics and Astronomy (miscellaneous) Scattering chemistry.chemical_element Liquid nitrogen Bismuth Nuclear physics Wavelength chemistry Water cooling Neutron source Neutron Atomic physics Nuclear Experiment Superfluid helium-4
Zdroj:	Technical Physics Letters. 41:1016-1018
ISSN:	1090-6533 1063-7850
Popis:	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-A 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-A 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0b0d5ba0a3d51eeb3b558cb40238b06c https://doi.org/10.1134/s1063785015100284 Zobrazit plný text záznamu Plný text ve formátu PDF