Abstract
We plan to measure the permanent electric dipole moment (EDM) of the elec- tron, which has the sensitivity to the CP violation in theories beyond the standard model by using the laser-cooled francium (Fr) atom. This paper reports the present status of the EDM measurement system. A high voltage application system was constructed in order to produce the strong electric field (100 kV /cm) needed for the experiment. After condi- tioning, the leakage current was 10 pA when a high voltage of 43 kV was applied. Also, a drift of an environmental field was measured at the planned location of the Fr-EDM experiment. The drift is suppressed at present down to the level of 10 pT by installing a 4-layer magnetic shield. Improvements are still needed to reach the required field stability of 1 fT.
Highlights
electric dipole moment (EDM) searches have already stepped into the phase in which the experimental upper limits would urge the theories to modify their parameters
We report the present status of the high voltage application system and the result of an environmental magnetic field measurement around the future location of the EDM experiment, both important items for the EDM measurement system
In order to suppress the change of the magnetic field at the EDM measurement location, we tentatively introduced a four layer cylindrical magnetic shield that was constructed for the development of the highly sensitive magnetometer utilizing the nonlinear magneto-optical rotation (NMOR) effect in Rb atomic vapor [9]
Summary
In view of these advantages, we plan to perform the EDM search experiment using the laser-cooled Fr atom. The experiments searching for the violation of the fundamental symmetries such as the measurements of EDM and PNC require several appropriate experimental conditions and sufficient beam times. Our laser-cooled Fr factory, which is being constructed at CYRIC, consists of the beam swinger magnet, the Fr ion source, the beam transport system, the ion-to-neutral atom converter, the MOT system, and the EDM measurement system.
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