3He Spin Transport in the SNS nEDM Experiment

Towards achieving a precision of $3 \times 10^{-28} e\cdot cm$, the SNS nEDM experiment will use a $^3$He comagnetometer, polarized by an external atomic beam source. The challenge of preserving the $^3$He polarization involves collecting spins from the ABS quadrupole field and tapering the field from 1 T down to 30 mG while passing through three layers of a magnetic shield enclosure. Using the magnetic scalar potential, we designed a system of coils to achieve an adiabatic magnetic field profile matching these requirements with less than $1\%$ loss in polarization. I will describe the design of our plans to characterize these coils.