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16 April 2024

» arxiv » 0808.3978

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Preparation of UCN facilities for fundamental research at PNPI
A. P. Serebrov ; V. A. Mityuklyaev ; A. A. Zakharov ; A. N. Erykalov ; M. S. Onegin ; A. K. Fomin ; V. A. Ilatovskiy ; S. P. Orlov ; K. A. Konoplev ; A. G. Krivshitch ; V. M. Samsonov ; V. F. Ezhov ; V. V. Fedorov ; K. O. Keshyshev ; S. T. Boldarev ; V. I. Marchenko ;
Date:	28 Aug 2008
Abstract:	At the WWWR-M reactor of PNPI there is a unique possibility to prepare the conditions of a low radiation heat release (about 410^-3 W/g) at a sufficiently good neutron flux (about 310^12 n/cm^2 s). This task can be realized inside the reactor thermal column which is a channel with a diameter of 1 meter allocated near the reactor core. This diameter of the channel allows to install a bismuth shielding (15 cm thick), a graphite premoderator (300 dm^3) at 20 K and a superfluid helium converter (35 dm^3) at 1.2 K. At a temperature of 1.2 K it is possible to remove the heat release power of about 20 W. Using a 4pi flux of cold neutrons inside the reactor column can bring the factor to about 5*10^3 with respect to the beam conditions. The storage time for UCN in superfluid He at 1.2 K is about 30 s. It is enough to use this UCN source in experimental schemes with a similar filling time. The calculated UCN density in the experimental installations with a volume of about 40 liters has to be about 10^4 n/cm^3. The technical solutions for realization of the project are discussed.
Source:	arXiv, 0808.3978
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