  We propose a theoretical scheme for atomic cooling, i.e. the compression of
both velocity and position distribution of particles in motion. This is
achieved by collisions of the particles with a combination of a moving atomic
mirror and a moving atom diode. An atom diode is a unidirectional barrier, i.e.
an optical device through which an atom can pass in one direction only. We show
that the efficiency of the scheme depends on the trajectory of the diode and
the mirror. We examine both the classical and quantum mechanical descriptions
of the scheme, along with the numerical simulations to show the efficiency in
each case.
