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Title: Optimized evaporative cooling for sodium Bose-Einstein condensation against three-body loss

Abstract

We report on a highly efficient evaporative cooling optimized experimentally. We successfully created sodium Bose-Einstein condensates with 6.4x10{sup 7} atoms starting from 6.6x10{sup 9} thermal atoms trapped in a magnetic trap by employing a fast linear sweep of radio frequency at the final stage of evaporative cooling so as to overcome the serious three-body losses. The experimental results such as the cooling trajectory and the condensate growth quantitatively agree with the numerical simulations of evaporative cooling on the basis of the kinetic theory of a Bose gas carefully taking into account our specific experimental conditions. We further discuss theoretically a possibility of producing large condensates, more than 10{sup 8} sodium atoms, by simply increasing the number of initial thermal trapped atoms and the corresponding optimization of evaporative cooling.

Authors:
; ; ; ;  [1];  [2]
  1. Department of Physics, Faculty of Science and Technology, Tokyo University of Science, Yamazaki, Noda-shi, Chiba 278-8510 (Japan)
  2. (Japan)
Publication Date:
OSTI Identifier:
22068771
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 84; Journal Issue: 3; Other Information: (c) 2011 American Institute of Physics; Country of input: Syrian Arab Republic; Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 74 ATOMIC AND MOLECULAR PHYSICS; ATOMS; AUGMENTATION; BOSE-EINSTEIN CONDENSATION; BOSE-EINSTEIN GAS; COMPUTERIZED SIMULATION; CONDENSATES; EVAPORATIVE COOLING; OPTIMIZATION; RADIOWAVE RADIATION; SODIUM; THREE-BODY PROBLEM; TRAJECTORIES; TRAPPING; TRAPS

Citation Formats

Shobu, Takahiko, Yamaoka, Hironobu, Imai, Hiromitsu, Morinaga, Atsuo, Yamashita, Makoto, and NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi-shi, Kanagawa 243-0198, Japan and Japan Science and Technology Agency, CREST, 5, Sanbancho, Chiyoda-ku Tokyo 102-0075. Optimized evaporative cooling for sodium Bose-Einstein condensation against three-body loss. United States: N. p., 2011. Web. doi:10.1103/PHYSREVA.84.033626.
Shobu, Takahiko, Yamaoka, Hironobu, Imai, Hiromitsu, Morinaga, Atsuo, Yamashita, Makoto, & NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi-shi, Kanagawa 243-0198, Japan and Japan Science and Technology Agency, CREST, 5, Sanbancho, Chiyoda-ku Tokyo 102-0075. Optimized evaporative cooling for sodium Bose-Einstein condensation against three-body loss. United States. doi:10.1103/PHYSREVA.84.033626.
Shobu, Takahiko, Yamaoka, Hironobu, Imai, Hiromitsu, Morinaga, Atsuo, Yamashita, Makoto, and NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi-shi, Kanagawa 243-0198, Japan and Japan Science and Technology Agency, CREST, 5, Sanbancho, Chiyoda-ku Tokyo 102-0075. Thu . "Optimized evaporative cooling for sodium Bose-Einstein condensation against three-body loss". United States. doi:10.1103/PHYSREVA.84.033626.
@article{osti_22068771,
title = {Optimized evaporative cooling for sodium Bose-Einstein condensation against three-body loss},
author = {Shobu, Takahiko and Yamaoka, Hironobu and Imai, Hiromitsu and Morinaga, Atsuo and Yamashita, Makoto and NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi-shi, Kanagawa 243-0198, Japan and Japan Science and Technology Agency, CREST, 5, Sanbancho, Chiyoda-ku Tokyo 102-0075},
abstractNote = {We report on a highly efficient evaporative cooling optimized experimentally. We successfully created sodium Bose-Einstein condensates with 6.4x10{sup 7} atoms starting from 6.6x10{sup 9} thermal atoms trapped in a magnetic trap by employing a fast linear sweep of radio frequency at the final stage of evaporative cooling so as to overcome the serious three-body losses. The experimental results such as the cooling trajectory and the condensate growth quantitatively agree with the numerical simulations of evaporative cooling on the basis of the kinetic theory of a Bose gas carefully taking into account our specific experimental conditions. We further discuss theoretically a possibility of producing large condensates, more than 10{sup 8} sodium atoms, by simply increasing the number of initial thermal trapped atoms and the corresponding optimization of evaporative cooling.},
doi = {10.1103/PHYSREVA.84.033626},
journal = {Physical Review. A},
issn = {1050-2947},
number = 3,
volume = 84,
place = {United States},
year = {2011},
month = {9}
}