The nEDM experiment at the Spallation Neutron Source (SNS) aims to increase experimental sensitivity to hadronic CP violation by nearly two orders of magnitude.To do that the nEDMSNS experiment requires an extremely uniform magnetic field to maintain 3He polarization during transit to the measurement cell. The Magnetic Shield Enclosure (MSE) coil provides the required field. However, the superconducting shield distorts the MSE field. This thesis discusses a magnetic cloak for the nEDM@SNS

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... ment that can restore the MSE field uniformity and cos theta coils designed to test the magnetic cloak in the first part. The second part of this thesis discusses a magnetic coil system designed for the wall depolarization measurement required in Phase 2 of Helium-3 system development. The magnetic coil system includes an active first-order gradient cancellation system to cancel any arbitrary background gradients using a symmetric 5-loop gradient coil. Then the gradient coils' design method is generalized to include higher order gradients. Also, two simulations are discussed, one for the 3He polarization as it is delivered to the injection volume and the other for the effect of second-order gradient on relaxation time T1.