dorsal/arxiv
View SchemaOptimized production of large Bose Einstein Condensates
| Authors | D. Comparat, A. Fioretti, G. Stern, E. Dimova, B. Laburthe Tolra, P. Pillet |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0602010 |
| URL | https://arxiv.org/abs/quant-ph/0602010 |
| DOI | 10.1103/PhysRevA.73.043410 |
Abstract
We suggest different simple schemes to efficiently load and evaporate a ''dimple'' crossed dipolar trap. The collisional processes between atoms which are trapped in a reservoir load in a non adiabatic way the dimple. The reservoir trap can be provided either by a dark SPOT Magneto Optical Trap, the (aberrated) laser beam itself or by a quadrupolar or quadratic magnetic trap. Optimal parameters for the dimple are derived from thermodynamical equations and from loading time, including possible inelastic and Majorana losses. We suggest to load at relatively high temperature a tight optical trap. Simple evaporative cooling equations, taking into account gravity, the possible occurrence of hydrodynamical regime, Feshbach resonance processes and three body recombination events are given. To have an efficient evaporation the elastic collisional rate (in s$^{-1}$) is found to be on the order of the trapping frequency and lower than one hundred times the temperature in micro-Kelvin. Bose Einstein condensates with more than $10^7$ atoms should be obtained in much less than one second starting from an usual MOT setup.
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"abstract": "We suggest different simple schemes to efficiently load and evaporate a\n\u0027\u0027dimple\u0027\u0027 crossed dipolar trap. The collisional processes between atoms which\nare trapped in a reservoir load in a non adiabatic way the dimple. The\nreservoir trap can be provided either by a dark SPOT Magneto Optical Trap, the\n(aberrated) laser beam itself or by a quadrupolar or quadratic magnetic trap.\nOptimal parameters for the dimple are derived from thermodynamical equations\nand from loading time, including possible inelastic and Majorana losses. We\nsuggest to load at relatively high temperature a tight optical trap. Simple\nevaporative cooling equations, taking into account gravity, the possible\noccurrence of hydrodynamical regime, Feshbach resonance processes and three\nbody recombination events are given. To have an efficient evaporation the\nelastic collisional rate (in s$^{-1}$) is found to be on the order of the\ntrapping frequency and lower than one hundred times the temperature in\nmicro-Kelvin. Bose Einstein condensates with more than $10^7$ atoms should be\nobtained in much less than one second starting from an usual MOT setup.",
"arxiv_id": "quant-ph/0602010",
"authors": [
"D. Comparat",
"A. Fioretti",
"G. Stern",
"E. Dimova",
"B. Laburthe Tolra",
"P. Pillet"
],
"categories": [
"quant-ph",
"cond-mat.other",
"physics.atom-ph"
],
"doi": "10.1103/PhysRevA.73.043410",
"title": "Optimized production of large Bose Einstein Condensates",
"url": "https://arxiv.org/abs/quant-ph/0602010"
},
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