Abstract

Evaporative cooling is a simple and very effective way of cooling atoms in magnetic trap, which has recently been the subject of considerable interest [1]. In this paper we describe a method of modelling this technique which is originally developed by Bird [2] for molecular gas dynamics and has some advantages when compared to other theoretical treatments for evaporative cooling [3]. This method was developed through consideration of the physics of gas flow instead of the mathematical description of vapor [3,4]. Using this method, we first studied cross-dimensional mixing in homogeneous and inhomogeneous gases and the results are consistent with those published; then we studied continuous cuts in two and three dimensions.

© 1996 IEEE