Increased efficiency of rf-induced evaporative cooling by utilizing gravity

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Autor/in:
Erscheinungsjahr:
2010
Medientyp:
Text
Schlagworte:
  • Cavities
  • Atoms
  • Superradiant phase
  • Quantum Optics
  • Quantum Computers
  • Quantum Theory
  • Cavities
  • Atoms
  • Superradiant phase
  • Quantum Optics
  • Quantum Computers
  • Quantum Theory
Beschreibung:
  • We report on an efficient rf-induced forced evaporative cooling of an ensemble of Rb87 atoms in state |F=2,mF=2□ magnetically trapped in a quadrupole-Ioffe configuration trap. The cigar-shaped trap is oriented with its weak confining axis along the direction of gravity leading to, first, a significant separation of the trapping positions for low-field-seeking atoms with different mF value and, second, a reduced resonance volume for rf-induced evaporation confined to a small region around the lower tip of the cigar-shaped ensemble. This results in an enhancement of the evaporation efficiency α ≡ d ln T/(dlnN) due to either reduced or completely vanishing scattering events between cooled and evaporated atoms. We present data illustrating this effect. © 2010 The American Physical Society.
Lizenz:
  • info:eu-repo/semantics/closedAccess
Quellsystem:
Forschungsinformationssystem der UHH
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oai:www.edit.fis.uni-hamburg.de:publications/f18fb8e4-e309-4018-9ba1-572f86a91a6e