Numerical calculation of electric field enhancement in neutron traps with rough walls coated with superfluid helium

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Abstract

A film of liquid helium on the surface of material traps for ultra-cold neutrons protects the neutrons from being absorbed by the trap walls. By using surface roughness and an electrostatic field, it is possible to maintain a helium film of sufficient thickness throughout the height of the trap. Our study includes a numerical calculation of the field distribution near the tip of various forms of such wall roughness of the trap and the discussion how this field helps to hold the helium film.

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About the authors

V. D. Kochev

National University of Science and Technology «MISIS»

Email: grigorev@itp.ac.ru
Russian Federation, Moscow

T. I. Mogilyuk

National Research Centre «Kurchatov Institute»

Email: grigorev@itp.ac.ru
Russian Federation, Moscow

S. S. Kostenko

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences

Email: grigorev@itp.ac.ru
Russian Federation, Chernogolovka

P. D. Grigoriev

National University of Science and Technology «MISIS»; L.D. Landau Institute for Theoretical Physics of the Russian Academy of Sciences

Author for correspondence.
Email: grigorev@itp.ac.ru
Russian Federation, Moscow; Chernogolovka

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Supplementary files

Supplementary Files
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2. Fig. 1. Calculation grid of finite elements for pyramids of size 𝑙R = ℎR = 1 μm. Distribution of electric field amplification factor is shown in color.

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3. Fig. 2. Electric field amplification near the roughness tip of the trap wall.

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4. Fig. 3. Curves from Fig. 2 in double logarithmic scale.

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