Progress Toward Improved Sensitivity in the ²²⁵Ra Electric Dipole Moment Experiment

Permanent electric dipole moments (EDMs) have emerged as powerful probes of fundamental symmetry violations in nature. Their observation would indicate violation of time-reversal and parity symmetries and, through the CPT theorem, imply CP violation. Discovering new sources of CP violation is essential to explain the observed matter-antimatter asymmetry of the universe, as the magnitude of CP violation predicted within the Standard Model is insufficient to account for this imbalance. The nucleus of ²²⁵Ra exhibits strong octupole deformation, which collectively enhances its Schiff moment and thus its sensitivity to CP-violating interactions. The most recent ²²⁵Ra EDM measurement (Bishof et al., Phys. Rev. C 94, 025501 (2016)) established an upper limit of |d(²²⁵Ra)| < 1.4 x 10^-23 e.cm. We describe ongoing experimental upgrades aimed at achieving a three-order-of-magnitude improvement in sensitivity. In particular, new methods for magnetic-field mapping and precise spin-precession detection are being developed using QuSpin sensors optimally positioned around a cosine-theta coil. These improvements are expected to increase magnetic-field uniformity and stability, reduce systematic uncertainties, and enable more precise measurements of the ²²⁵Ra EDM in the future.