dorsal/arxiv
View SchemaAccumulation and thermalization of cold atoms in a finite-depth magnetic trap
| Authors | R. Chicireanu, Q. Beaufils, A. Pouderous, B. Laburthe-Tolra, E. Marechal, J. V. Porto, L. Vernac, J. C. Keller, O. Gorceix |
|---|---|
| Categories | |
| ArXiv ID | physics/0612133 |
| URL | https://arxiv.org/abs/physics/0612133 |
| DOI | 10.1103/PhysRevA.76.023406 |
Abstract
We experimentally and theoretically study the continuous accumulation of cold atoms from a magneto-optical trap (MOT) into a finite depth trap, consisting in a magnetic quadrupole trap dressed by a radiofrequency (RF) field. Chromium atoms (52 isotope) in a MOT are continuously optically pumped by the MOT lasers to metastable dark states. In presence of a RF field, the temperature of the metastable atoms that remain magnetically trapped can be as low as 25 microK, with a density of 10^17 atoms.m-3, resulting in an increase of the phase-space density, still limited to 7.10^-6 by inelastic collisions. To investigate the thermalization issues in the truncated trap, we measure the free evaporation rate in the RF-truncated magnetic trap, and deduce the average elastic cross section for atoms in the 5D4 metastable states, equal to 7.0 10^-16m2.
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"abstract": "We experimentally and theoretically study the continuous accumulation of cold\natoms from a magneto-optical trap (MOT) into a finite depth trap, consisting in\na magnetic quadrupole trap dressed by a radiofrequency (RF) field. Chromium\natoms (52 isotope) in a MOT are continuously optically pumped by the MOT lasers\nto metastable dark states. In presence of a RF field, the temperature of the\nmetastable atoms that remain magnetically trapped can be as low as 25 microK,\nwith a density of 10^17 atoms.m-3, resulting in an increase of the phase-space\ndensity, still limited to 7.10^-6 by inelastic collisions. To investigate the\nthermalization issues in the truncated trap, we measure the free evaporation\nrate in the RF-truncated magnetic trap, and deduce the average elastic cross\nsection for atoms in the 5D4 metastable states, equal to 7.0 10^-16m2.",
"arxiv_id": "physics/0612133",
"authors": [
"R. Chicireanu",
"Q. Beaufils",
"A. Pouderous",
"B. Laburthe-Tolra",
"E. Marechal",
"J. V. Porto",
"L. Vernac",
"J. C. Keller",
"O. Gorceix"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1103/PhysRevA.76.023406",
"title": "Accumulation and thermalization of cold atoms in a finite-depth magnetic trap",
"url": "https://arxiv.org/abs/physics/0612133"
},
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