Production and accumulation of isotopically pure helium-4 for ultracold neutron source
Lyamkin V. A. 1, Serebrov A. P.1, Koptyukhov A. O.1, Prudnikov D. V.1, Borodinov G. O.1, Nedolyak A. A.1, Hazov P. A.1, Sirotin A. V.1,2, Salyuk A. N.3
1Konstantinov Petersburg Nuclear Physics Institute, National Research Center Kurchatov Institute, Gatchina, Russia
2ITMO University, St. Petersburg, Russia
3V.I. Il’ichev Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia
Email: lyamkin_va@pnpi.nrcki.ru, serebrov_ap@pnpi.nrcki.ru, koptyukhov_ao@pnpi.nrcki.ru, dpvbox@mail.ru, borodinov_go@pnpi.nrcki.ru, Nedolyak_aa@pnpi.nrcki.ru, hazov_pa@pnpi.nrcki.ru, sirotin_av@pnpi.nrcki.ru, san@poi.dvo.ru

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A high-intensity ultracold neutron source (UCN) is being created at the NRC "Kurchatov Institute" - PNPI. It is going to be placed at the PIK reactor, for scientific research in the field of physics of fundamental interactions. The UCN source will use superfluid helium, which will make it possible to achieve a UCN density of 2.2· 103 cm-3. To achieve these parameters, the commercial helium used as a converter has been purified from the helium-3 isotope by 3 orders of magnitude. Due to this it became possible to increase the neutron storage time in helium from 3.1 to 38.6 s. The helium was purified using a superleak filter made of pressed Al2O3 powder. As a result of this work, 43 m3 of isotopically pure 4He was produced and stored Keywords: ultracold neutrons, superleak helium, neutron EDM, PIK reactor, mass spectrometry.
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