Design of a Transverse Laser Cooling Beamline for Radium-Containing Molecules

Radium-containing molecules, such as RaF and RaOH, provide extreme sensitivity to symmetry-violating effects. Due to the heavy octupole-deformed nuclei of ²²⁵Ra, such molecules are predicted to enhance the sensitivity to time-reversal violating nuclear properties by a factor of more than 1000 with respect to symmetric nuclei. Measuring such effects requires laser cooling and trapping these radioactive molecules. In this work, I will present the design of the beamline that will be used to perform transverse laser cooling on cryogenic buffer-gas beams of ²²⁶RaF and ²²⁶RaOH using magnetically assisted Sisyphus cooling. Design considerations and simulations of the magnetic fields and optical components required to achieve >5 m/s capture velocity will be discussed. The cooling and trapping of these ²²⁶RaX molecules is an essential prerequisite to long interrogation times with trapped ²²⁵RaX for high sensitivity searches for new physics beyond the Standard Model.