Large Magnetic Shielding Factor Measured by Nonlinear Magneto-optical Rotation

Abstract

A passive magnetic shield was designed and constructed for magnetometer tests for the future neutron electric dipole moment experiment at TRIUMF. The axial shielding factor of the magnetic shield was measured using a magnetometer based on non-linear magneto-optical rotation of the plane of polarized laser light upon passage through a paraffin-coated vapour cell containing natural Rb at room temperature. The laser was tuned to the Rb D1 line, near the ${}^{85}$Rb $F=2\to 2,3$ transition. The shielding factor was measured by applying an axial field externally and measuring the magnetic field internally using the magnetometer. The axial shielding factor was determined to be $(1.3\pm 0.1)\times 10^7$, from an applied axial field of 1.45~$\mu$T in the background of Earth's magnetic field.

References in corpus (8)

• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
• All-Optical Vector Atomic Magnetometer
• A magnetically shielded room with ultra low residual field and gradient
• Dynamic stabilization of the magnetic field surrounding the neutron electric dipole moment spectrometer at the Paul Scherrer Institute
• Robust, High-speed, All-Optical Atomic Magnetometer
• New measurements of neutron electric dipole moment
• Magnetometric sensitivity optimization for nonlinear optical rotation with frequency-modulated light: rubidium D2 line
• A Proposal for a Cryogenic Experiment to Measure the Neutron Electric Dipole Moment (nEDM)

Cited by in corpus (1)

• Sensitivity of Fields Generated within Magnetically Shielded Volumes to Changes in Magnetic Permeability