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- Title
Discrete-step evaporation of an atomic beam.
- Authors
Lahaye, T.; Guéry-Odelin, D.
- Abstract
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 108 in phase-space density.
- Subjects
EVAPORATIVE cooling; ATOMIC beams; RADIO frequency; COLLISIONS (Physics); PHYSICS
- Publication
European Physical Journal D (EPJ D), 2005, Vol 33, Issue 1, p67
- ISSN
1434-6060
- Publication type
Article
- DOI
10.1140/epjd/e2005-00007-y