title: Vectorial velocity filter for ultracold neutrons based on a surface-disordered mirror system.
abstract: We perform classical three-dimensional Monte Carlo simulations of ultracold neutrons scattering through an absorbing-reflecting mirror system in the Earth's gravitational field. We show that the underlying mixed phase space of regular skipping motion and random motion due to disorder scattering can be exploited to realize a vectorial velocity filter for ultracold neutrons. The absorbing-reflecting mirror system proposed allows beams of ultracold neutrons with low angular divergence to be formed. The range of velocity components can be controlled by adjusting the geometric parameters of the system. First experimental tests of its performance are presented. One potential future application is the investigation of transport and scattering dynamics in confined systems downstream of the filter.
authors.affiliation: Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, 1040 Vienna, Austria, EU.
authors.forename: L A
authors.initials: LA
authors.lastname: Chizhova
authors.affiliation: Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, 1040 Vienna, Austria, EU.
authors.forename: S
authors.initials: S
authors.lastname: Rotter
authors.affiliation: Institute of Atomic and Subatomic Physics, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria, EU.
authors.forename: T
authors.initials: T
authors.lastname: Jenke
authors.affiliation: Institute of Atomic and Subatomic Physics, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria, EU.
authors.forename: G
authors.initials: G
authors.lastname: Cronenberg
authors.affiliation: Institut Laue-Langevin, BP 156, 6, rue Jules Horowitz, 38042 Grenoble Cedex 9, France, EU.
authors.forename: P
authors.initials: P
authors.lastname: Geltenbort
authors.affiliation: Institute of Atomic and Subatomic Physics, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria, EU.
authors.forename: G
authors.initials: G
authors.lastname: Wautischer
authors.affiliation: Institute of Atomic and Subatomic Physics, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria, EU.
authors.forename: H
authors.initials: H
authors.lastname: Filter
authors.affiliation: Institute of Atomic and Subatomic Physics, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria, EU.
authors.forename: H
authors.initials: H
authors.lastname: Abele
authors.affiliation: Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, 1040 Vienna, Austria, EU.
authors.forename: J
authors.initials: J
authors.lastname: Burgdörfer