An actively-shielded coil inside three mu-metal layers produces a magnetic field uniform to better than 1 nanotesla over a meter-long precession volume, enabling a projected 40-fold reduction in magnetic-field-related systematics for the ACME III electron EDM search.
Comment on "Theoretical study of thorium monoxide for the electron electric dipole moment search: Electronic properties of ${H}^3\Delta_1$ in ThO"
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abstract
We present an updated EDM effective electric field of $E_{\text{eff}} = 75.2\left[\frac{\rm GV}{\rm cm}\right]$ and the electron-nucleon scalar-pseudoscalar interaction constant $W_S=107.8$ [kHz] for the ${^3\Delta}_1$ science state of ThO. The criticisms made in reference [J. Chem. Phys. 142, 024301 (2015)] are addressed and largely found to be unsubstantiated within the framework of our approach.
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Compact Actively-Shielded Magnetic Field Coil within Mu-Metal Shields for ACME Electric Dipole Moment Measurements
An actively-shielded coil inside three mu-metal layers produces a magnetic field uniform to better than 1 nanotesla over a meter-long precession volume, enabling a projected 40-fold reduction in magnetic-field-related systematics for the ACME III electron EDM search.