Discrete-step evaporation of an atomic beam

Details Discrete-step evaporation of an atomic beam Discrete-step evaporation of an atomic beam

2004-09-09

arxiv.org/abs/cond-mat/0409223v2

European Physical Journal D 33 (2005) 67-75

Physics

Condensed Matter

Other Condensed Matter

Submitted to Eur. Phys. J. D

Scientific paper

10.1140/epjd/e2005-00007-y

We present a theoretical analysis of the evaporative cooling of a magnetically guided atomic beam by means of discrete radio-frequency antennas. First we derive the changes in flux and temperature, as well as in collision rate and phase-space density, for a single evaporation step. Next we show how the occurrence of collisions during the propagation between two successive antennas can be probed. Finally, we discuss the optimization of the evaporation ramp with several antennas to reach quantum degeneracy. We estimate the number of antennas required to increase the phase-space density by several orders of magnitude. We find that at least 30 antennas are needed to gain a factor $10^8$ in phase-space density.

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