Vectorial velocity filter for ultracold neutrons based on a surface-disordered mirror system.

摘要: We perform classical three-dimensional Monte Carlo simulations of ultracold neutrons scattering through an absorbing-reflecting mirror system in the Earth's gravitational field. show that underlying mixed phase space regular skipping motion and random due to disorder can be exploited realize a vectorial velocity filter for neutrons. The proposed allows beams with low angular divergence formed. range components controlled by adjusting geometric parameters system. First experimental tests its performance are presented. One potential future application is investigation transport dynamics confined systems downstream filter.