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PRODID:UW-Physics-TWaP
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UID:UW-Physics-Event-2806
DTSTART:20121004T100000
DURATION:PT1H0M0S
LOCATION:5310 Chamberlin
SUMMARY:Atom Interferometry in an inductively coupled ring trap\, Atomic Physics Seminar\, Jonathan Pritchard\, University of Strathclyde\, Glasgow
DESCRIPTION:Atom interferometry offers a number advantages to the field of precision metrology overt over optical interferometers due to the sensitivity of atoms to external electromagnetic fields and inertial forces. Utilising a circular waveguide has the further benefit of providing a strong common-mode rejection between paths and rotational sensitivity via the Sagnac effect\, whilst also permitting longer interaction times compared to optical sensors. We present the first demonstration of a novel inductively coupled ring trap for cold atoms to create a circular waveguide of radius 5 mm. A uniform\, ac magnetic field induces current in a copper ring\, which creates an opposing magnetic field that is time-averaged to produce a smooth cylindrically symmetric ring trap. This resolves the issue of perturbations due to electrical connections and benefits from averaging out corrugation of the potential due to current meandering. A laser-cooled atomic sample is used to characterise the loading efficiency and adiabaticity of the magnetic potential\, achieving a vacuum-limited lifetime in the trap. This technique is suitable for creating scalable toroidal waveguides for applications in matterwave interferometry\, with a large enclosed area and long interaction times. Development of a second generation apparatus to utilise the ac ring trap for Sagnac interferometry with Bose (87Rb) and Fermi (40K) quantum degenerate gases is described.
URL:http://www.physics.wisc.edu/twap/view.php?id=2806
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