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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2806
DTSTART:20121004T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260420T034715Z
LAST-MODIFIED:20120924T131823Z
LOCATION:5310 Chamberlin
SUMMARY:Atom Interferometry in an inductively coupled ring trap\, Atom
 ic Physics Seminar\, Jonathan Pritchard\, University of Strathclyde\, 
 Glasgow
DESCRIPTION:Atom interferometry offers a number advantages to the fiel
 d 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 prov
 iding a strong common-mode rejection between paths and rotational sens
 itivity via the Sagnac effect\, whilst also permitting longer interact
 ion times compared to optical sensors. We present the first demonstrat
 ion of a novel inductively coupled ring trap for cold atoms to create 
 a circular waveguide of radius 5 mm. A uniform\, ac magnetic field ind
 uces current in a copper ring\, which creates an opposing magnetic fie
 ld that is time-averaged to produce a smooth cylindrically symmetric r
 ing trap. This resolves the issue of perturbations due to electrical c
 onnections and benefits from averaging out corrugation of the potentia
 l due to current meandering. A laser-cooled atomic sample is used to c
 haracterise the loading efficiency and adiabaticity of the magnetic po
 tential\, achieving a vacuum-limited lifetime in the trap. This techni
 que is suitable for creating scalable toroidal waveguides for applicat
 ions in matterwave interferometry\, with a large enclosed area and lon
 g interaction times. Development of a second generation apparatus to u
 tilise the ac ring trap for Sagnac interferometry with Bose (87Rb) and
  Fermi (40K) quantum degenerate gases is described.
URL:https://www.physics.wisc.edu/events/?id=2806
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