Dynamics of evaporative cooling in magnetically trapped atomic hydrogen

Details Dynamics of evaporative cooling in magnetically trapped atomic hydrogen Dynamics of evaporative cooling in magnetically trapped atomic hydrogen

2000-07-11

arxiv.org/abs/cond-mat/0007179v1

Phys. Rev. A 62, 033602 (2000)

Physics

Condensed Matter

Statistical Mechanics

5 pages, REVTeX, 3 eps figures, Phys. Rev. A in press

Scientific paper

10.1103/PhysRevA.62.033602

We study the evaporative cooling of magnetically trapped atomic hydrogen on the basis of the kinetic theory of a Bose gas. The dynamics of trapped atoms is described by the coupled differential equations, considering both the evaporation and dipolar spin relaxation processes. The numerical time-evolution calculations quantitatively agree with the recent experiment of Bose-Einstein condensation with atomic hydrogen. It is demonstrated that the balance between evaporative cooling and heating due to dipolar relaxation limits the number of condensates to 9x10^8 and the corresponding condensate fraction to a small value of 4% as observed experimentally.

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