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To increase the storage time of ultracold neutrons (UCN) inside the materialtraps it is promising to cover the trap walls by liquid 4He, the material whichdoes not absorb neutrons at all. A rough side wall of UCN trap holds therequired amount of 4He by the capillary effects, but the edges of wallroughness remain insufficiently coated. Here we propose to apply an electricvoltage to these rough side walls of UCN traps to increases the thickness ofliquid He on the wall edges and to cover the entire wall surface bysufficiently thick helium films. This completely protects UCN from beingabsorbed inside the trap walls. We estimate the required electric field andvoltage for several possible designs of UCN traps. This improvement may giverise to a new generation of ultracold neutron traps with very long storagetime. We also estimate the influence of this electric field on the dispersionof ripplons - the quanta surface waves, which give the main contribution to theinelastic UCN scattering at low temperature.

Improving of ultracold neutron traps coated with liquid helium using capillarity and electric field