A compact high-flux cold atom beam source
  We report on an efficient and compact high-flux Cs atom beam source based on a retro-reflected two-dimensional magneto-optical trap (2D MOT). We realize an effective pushing field component by tilting the 2D MOT collimators towards a separate three-dimensional magneto-optical trap (3D MOT) in ultra-high vacuum. This technique significantly improved 3D MOT loading rates to greater than $8 \times 10^9$ atoms/s using only 20 mW of total laser power for the source. When operating below saturation, we achieve a maximum efficiency of $6.2 \times 10^{11}$ atoms/s/W. 
J. R. Kellogg, D. Schlippert, J. M. Kohel, R. J. Thompson, D. C.   Aveline, N. Yu
physics.atom-ph cond-mat.quant-gas