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Editor-in-Chief
Nikiforov
Vladimir O.
D.Sc., Prof.
Partners
doi: 10.17586/2226-1494-2019-19-3-538-545
THERMAL MODE OF ULTRACOLD NEUTRON SOURCE AT WWR-M REACTOR
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Abstract
Serebrov A.P., Lyamkin V.A., Koptyukhov A.O., Onegin M.S. Thermal mode of ultracold neutron source at WWR-M reactor. Scientific and Technical Journal of Information Technologies, Mechanics and Optics, 2019, vol. 19, no. 3, pp. 538–545 (in Russian). doi: 10.17586/2226-1494-2019-19-3-538-545
Abstract
The paper presents the results on creation of a source of ultracold neutrons in the National Research Center “Kurchatov Institute” — PNPI. The source has three temperature zones: a helium chamber with superfluid helium at the temperature of 1.3 K, a deuterium chamber with liquid deuterium at the temperature of 20 K, a vacuum case with a lead screen and graphite blocks at room temperature. All these parts are exposed to cooling under the conditions of the reactor heat load. Calculations associated with the design of cooling circuits are presented. Analytically, a mass flow rate of 0.56 kg/s was obtained for cooling of the lead screen with a volumetric heat flow of 27 kW. A pump and a heat exchanger were selected for an autonomous cooling circuit on the basis of this flow. At this thermal mode, the radiant heat gain from the nose part of the vacuum module to the deuterium capsule was 24 watts. The total heat flux to the deuterium capsule and liquid deuterium, taking into account the reactor radiation, was 0.3 kW. To maintain the phase state of deuterium, temperature control is required in the temperature range 18.73–24.122. The finite-square method proved the possibility of safely maintaining the phase state of liquid deuterium in a 60-liter capsule with a flow of helium gas of 50 g/s.
Keywords: ultracold neutron source, BWR-M reactor, natural convection, reactor radiation, Comsol Multiphysics
Acknowledgements. The study was carried out at the Research Center “Kurchatov Institute” — PNPI by a grant from the Russian Science Foundation (project No. 14-22-00105).
References
Acknowledgements. The study was carried out at the Research Center “Kurchatov Institute” — PNPI by a grant from the Russian Science Foundation (project No. 14-22-00105).
References
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3. Serebrov A.P., Kislitsin B.V., Onegin M.S., Lyamkin V.A., Prudnikov D.V., Ilatovskiy V.A., Orlov S.P., Kirsanov G.A., Fomin A.K., Filchenkova D.V. The energy release and temperature field in the ultracold neutron source of the WWR-M reactor at the Peterburg Nuclear Physics Institute. Physics of Atomic Nuclei, 2016, vol. 79, no. 9-10, pp. 1391–1396. doi: 10.1134/s1063778816090118
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6. Onegin M.S., Serebrov A.P., Fomin A.K., Lyamkin V.A. Estimation of the ultracold neutron production by a source designed for the WWR-M reactor. Technical Physics, 2017, vol. 62, no. 4, pp. 633–637. doi: 10.1134/s1063784217040193
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8. Serebrov A.P., Lyamkin V.A., Koptyukhov A.O., Onegin M.S., Prudnikov D.V., Samodurov O.Yu., Ivanov S.N. Temperature calculation of the cryogenic module of the UCN source at the WWR-M reactor. Proc. 5th Forum OpenScience. Gatchina, Russia, 2018, p. 29.
9. Serebrov A.P., Kislitsyn B.V., Onegin M.S. Energy release and temperature field in the source of ultracold neutrons at the WWR-M reactor PNPI. Yadernaya Fizika i Inzhiniring, 2015, vol. 6, no. 5-6, pp. 297–303. (in Russian) doi: 10.1134/S2079562915030124
10. Serebrov A.P., Lyamkin V.A., Prudnikov D.V., Vasil’ev A.V., Keshishev K.O., Boldarev S.T. Putting in operation a full-scale ultracold-neutron source model with superfluid helium. Technical Physics. The Russian Journal of Applied Physics, 2017, vol. 62, no. 2, pp. 329–333. doi: 10.1134/S1063784217020256
11. Serebrov A.P. Program of fundamental-interaction research for the ultracold-neutron source at the the WWR-M reactor. Physics of Atomic Nuclei, 2018, vol. 81, no. 2, pp. 214–221. doi: 10.1134/s1063778818020175
12. Serebrov A.P., Fomin A.K., Kharitonov A.G. et al. High-density ultracold neutrons source for the WWR-M reactor for scientific research in fundamental physics. Vestnik of St. Petersburg State University, Physics, Chemistry, 2015, vol. 2, no. 1, pp. 27–41. (in Russian)
13. Briesmeister J.F. MCNP — A General Monte Carlo N-Particle Transport Code. Version 4C. Los Alamos, New Mexico: Los Alamos National Laboratory, 2000.
14. Segerlind L.J. Applied Finite Element Analysis. Wiley, 1976.
15. Dul’nev G.N., Parfenov V.G., Sigalov A.V. Using of electronic computer for solving heat exchange problems. Moscow, Vysshaya Shkola Publ., 1990, 207 p. (in Russian)
2. Serebrov A.P., Lyamkin V.A., Fomin A.K., Samodurov O.Yu., Kanin A.S. UCN source with superfluid helium at WWR-M reactor. Journal of Physics Conference Series, 2017, vol. 798, p. 012147. doi: 10.1088/1742-6596/798/1/012147
3. Serebrov A.P., Kislitsin B.V., Onegin M.S., Lyamkin V.A., Prudnikov D.V., Ilatovskiy V.A., Orlov S.P., Kirsanov G.A., Fomin A.K., Filchenkova D.V. The energy release and temperature field in the ultracold neutron source of the WWR-M reactor at the Peterburg Nuclear Physics Institute. Physics of Atomic Nuclei, 2016, vol. 79, no. 9-10, pp. 1391–1396. doi: 10.1134/s1063778816090118
4. Serebrov A.P. Supersource of ultracold neutrons at the wwr-m reactor and the program of fundamental research in physics. Crystallography Reports, 2011, vol. 56, no. 7, pp. 1230–1237. doi: 10.1134/s1063774511070303
5. Serebrov A.P., Lyamkin V.A., Fomin A.K., Prudnikov D.V., Samodurov O. Yu., Kanin A.S., Keshishev K.O., Boldarev S.T. High-density ultracold neutrons source for the WWR-M reactor. Yadernaya Fizika i Inzhiniring, 2017, vol. 8, no. 3, pp. 235–241. (in Russian) doi: 10.1134/S207956291701016X
6. Onegin M.S., Serebrov A.P., Fomin A.K., Lyamkin V.A. Estimation of the ultracold neutron production by a source designed for the WWR-M reactor. Technical Physics, 2017, vol. 62, no. 4, pp. 633–637. doi: 10.1134/s1063784217040193
7. Akhiezer A.I., Pomeranchuk I.Ya. On the scattering of neutrons with an energy of several degrees in liquid helium II. Soviet Physics — JETP, 1946, no. 16, p. 391. (in Russian)
8. Serebrov A.P., Lyamkin V.A., Koptyukhov A.O., Onegin M.S., Prudnikov D.V., Samodurov O.Yu., Ivanov S.N. Temperature calculation of the cryogenic module of the UCN source at the WWR-M reactor. Proc. 5th Forum OpenScience. Gatchina, Russia, 2018, p. 29.
9. Serebrov A.P., Kislitsyn B.V., Onegin M.S. Energy release and temperature field in the source of ultracold neutrons at the WWR-M reactor PNPI. Yadernaya Fizika i Inzhiniring, 2015, vol. 6, no. 5-6, pp. 297–303. (in Russian) doi: 10.1134/S2079562915030124
10. Serebrov A.P., Lyamkin V.A., Prudnikov D.V., Vasil’ev A.V., Keshishev K.O., Boldarev S.T. Putting in operation a full-scale ultracold-neutron source model with superfluid helium. Technical Physics. The Russian Journal of Applied Physics, 2017, vol. 62, no. 2, pp. 329–333. doi: 10.1134/S1063784217020256
11. Serebrov A.P. Program of fundamental-interaction research for the ultracold-neutron source at the the WWR-M reactor. Physics of Atomic Nuclei, 2018, vol. 81, no. 2, pp. 214–221. doi: 10.1134/s1063778818020175
12. Serebrov A.P., Fomin A.K., Kharitonov A.G. et al. High-density ultracold neutrons source for the WWR-M reactor for scientific research in fundamental physics. Vestnik of St. Petersburg State University, Physics, Chemistry, 2015, vol. 2, no. 1, pp. 27–41. (in Russian)
13. Briesmeister J.F. MCNP — A General Monte Carlo N-Particle Transport Code. Version 4C. Los Alamos, New Mexico: Los Alamos National Laboratory, 2000.
14. Segerlind L.J. Applied Finite Element Analysis. Wiley, 1976.
15. Dul’nev G.N., Parfenov V.G., Sigalov A.V. Using of electronic computer for solving heat exchange problems. Moscow, Vysshaya Shkola Publ., 1990, 207 p. (in Russian)