Numerical Calculation of Electric Field Enhancement in Neutron Traps with Rough Walls Coated with Superfluid Helium

Abstract

A film of liquid helium on the surface of material traps for ultracold 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. The field distribution near the tip of such wall roughness of the trap was calculated, and the effect of this field on holding the helium film was estimated.

6 pages, 3 figures

References in corpus (10)

• The deal.II finite element library: design, features, and insights
• Measurement of the Weak Axial-Vector Coupling Constant in the Decay of Free Neutrons Using a Pulsed Cold Neutron Beam
• Low Energy Precision Test of Supersymmetry
• Neutron lifetime measurements using gravitationally trapped ultracold neutrons
• Determination of the Axial-Vector Weak Coupling Constant with Ultracold Neutrons
• Improved limits on Fierz Interference using asymmetry measurements from the UCNA experiment
• Spin flip loss in magnetic confinement of ultracold neutrons for neutron lifetime experiments
• Helium film may greatly increase the storage time of ultracold neutrons in material traps
• On the possibility of a significant increase in the storage time of ultracold neutrons in traps coated with a liquid helium film
• Improving of ultracold neutron traps coated with liquid helium using capillarity and electric field