  We have constructed and modeled a simple and efficient source of slow atoms.
  From a background vapour loaded magneto-optical trap, a thin laser beam
extracts a continuous jet of cold rubidium atoms. In this setup, the extraction
column that is typical to leaking MOT systems is created without any optical
parts placed inside the vacuum chamber. For detailed analysis, we present a
simple 3D numerical simulation of the atomic motion in the presence of multiple
saturating laser fields combined with an inhomogeneous magnetic field. At a
pressure of $P_{\rm Rb87}=1 \times 10^{-8}$ mbar, the moderate laser power of
10 mW per beam generates a jet of flux $\Phi =1.3\times 10^8$ atoms/s with a
mean velocity of 14 m/s and a divergence of $<20$ mrad.
