  A Cs fountain electron electric dipole moment (EDM) experiment using
electric-field quantization is demonstrated. With magnetic fields reduced to
200 pT or less, the electric field lifts the degeneracy between hyperfine
levels of different|mF| and, along with the slow beam and fountain geometry,
suppresses systematics from motional magnetic fields. Transitions are induced
and the atoms polarized and analyzed in field-free regions. The feasibility of
reaching a sensitivity to an electron EDM of 2 x 10 exp(-50) C-m [1.3 x 10
exp(-29) e-cm] in a cesium fountain experiment is discussed.
