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Progress towards a measurement of the electron electrical dipole moment using
ultra-cold atoms
Fang Fang
Department of Physics, Pennsylvania State University In this talk, the basic theories of the C, P, T symmetries are introduced and the ongoing experiments to measure the electric dipole moment are summarized. We propose an experiment to search for the electric dipole moment (edm) of the electron using Cs and Rb atoms trapped in 1D optical lattice traps. Our projected sensitivity is 3×10-30 e-cm with a integration time of 12 hours, a 500-fold improvement over the current limit. We demonstrate that Cs atoms launched up 90 cm from MOT to the center of the measurement chamber while guided by a resonator enhanced 1D optical lattice trap with transport efficiency up to 50%. The 1064 nm wavelength optical lattice is made in a 2 m long build-up cavity of light, and provides a transverse guide depth of up to 250 (K. Before they reach the top of their trajectory, the atoms are stopped and cooled by optical molasses, becoming trapped in the 1D lattice, which can be loaded with multiple launches. The preliminary testing results for small ITO coated electric field plates charging are given, and the designs of a magnetic shielding system and cancellation coils are also described. In the end, noises and systematic errors in our designed experiment are analyzed. |