Bose–Einstein condensation in a mm-scale Ioffe–Pritchard trap

Applied Physics B (Impact Factor: 1.63). 01/2006; 82(4):533-538. DOI: 10.1007/s00340-005-2101-1
Source: arXiv

ABSTRACT We have constructed a mm-scale Ioffe–Pritchard trap capable of providing axial field curvature of 7800G/cm2 with only 10.5A of driving current. Our novel fabrication method involving electromagnetic coils formed of anodized aluminum strips is compatible with ultra-high vacuum conditions, as demonstrated by our using the trap to produce Bose–Einstein condensates of 106
87Rb atoms. The strong axial curvature gives access to a number of experimentally interesting configurations such as tightly confining prolate, nearly isotropic, and oblate spheroidal traps, as well as traps with variable tilt angles with respect to the nominal axial direction.


Available from: Dan Stamper-Kurn, Jun 25, 2014
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: I will discuss the various experimental techniques to achieve BEC of bosonic 7Li. The emphasis is on the Mini trap. A Mini trap is a DC Ioffe-Pritchard type of magnetic trap of a few millimeters scale. With a size much smaller than the traditional magnetic trap, it has a comparable confinement, but dissipates 2-3 orders of magnitude less power. At 100A, it dissipates about 7W and has a trap depth of 70G. Because its trapping volume is comparable to the size of the MOT, an effective transfer from the MOT to the magnetic trap is easily achieved. We can easily transfer 2 * 108 atoms to the trap, which is 2 orders of magnitude more than a typical Micro trap. The Mini trap is immunized to the surface interaction problem of Micro trap. Its trap life-time is about 90 seconds at 78A while a typical Micro trap life-time is only 5 seconds. Also mentioned is a proposed broadband optical slower. The unique advantage of the broadband optical slower is that we can achieve transverse cooling and longitudinal slowing at the same time, which can increase the cold atom beam flux by 2 orders of magnitude. Broadband optical slower does not need a strong magnetic field, unlike the Zeeman slower, which can be very important for precise measurement experiments.
  • Source
  • [Show abstract] [Hide abstract]
    ABSTRACT: In this paper, We demonstrate an approach to determine the phase transition point and critical temperature of Bose-Einstein condensation. During the fitting sequence of time-of-flight images, for just one picture we take four kinds of different calculations instead of only one. By calculating the quantitative least-square errors, which have always been neglected before, we find out that this value can act as a criterion to judge the status of atom clouds. Using this criterion, we can not only discriminate the status around the phase transition point, but can also find the critical point precisely. Also with this method, we can achieve the totally automatical running of calculating programs without human's judgments.
    Chinese Physics Letters 01/2006; 23(1):79-82. DOI:10.1088/0256-307X/23/1/024 · 0.92 Impact Factor