[Triumf-seminars] TRIUMF ISAC Seminar today at 15:15

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Date/Time: Wed 2005-09-14 at 15:15

Location:  Auditorium          

Speaker:   Erika Prime (UBC/TRIUMF)

Title:     Loading of a Far Off Resonance dipole Force Trap for stable 39K

Abstract: The TRIumf Neutral Atom Trap (TRINAT) group is performing precision measurements to test the standard model of the weak interaction. Nuclear beta decay asymmetry experiments are carried out on radioactively decaying potassium isotopes, trapped in a Magneto Optical Trap (MOT). In order to accurately test whether parity is fully violated, atoms of well defined polarisation are required. A useful tool which can achieve a high level of polarisation is a Circularly polarized Far Off Resonance dipole Force Trap (CFORT). Presented here is the first step in its development; successful loading of stable 39K into a linearly polarised FORT from a MOT, where the atoms are pre-cooled to a temperature of a few hundred uK. The FORT consists of 700mW of light from a Titanium Sapphire ring laser, linearly polarized and focused with a 200mm achromatic lens to a waist of 35um. The light is detuned between 1 and 20nm from the D1 transition and this gives rise to trap depths in the region of a few millikelvin. A characterisation of the FORT loading efficiency and lifetime as a function of FORT beam detuning, power and ellipticity will be presented.




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