Reversible Formation of a Bose-Einstein Condensate
  We present a method of adiabatically changing the local phase-space density of an ultracold gas, using a combination of magnetic and optical forces. Applying this method, we observe phase-space density increases in a gas of sodium atoms by as much as 50-fold. The transition to Bose-Einstein condensation was crossed reversibly, attaining condensate fractions of up to 30%. Measurements of the condensate fraction reveal its reduction due to interactions. 
D.M. Stamper-Kurn, H.-J. Miesner, A.P. Chikkatur, S. Inouye, J.   Stenger, and W. Ketterle