Magnetic Gradient Coil Design and Validation for the LANL nEDM Experiment*

A permanent neutron Electric Dipole Moment (nEDM) presents an experimentally accessible probe for physics beyond the Standard Model. The nEDM@LANL collaboration is constructing a double-cell room-temperature nEDM experiment that aims to use the improved ultracold neutron source, Hg co-magnetometry, magnetic shielding, and magnetic field generation to yield a five-fold improvement in uncertainty to 3×10²⁷ e·cm.

In spite of our best efforts to design and build a perfect magnetically shielded room (MSR) and B₀ coils, we will need a coil package capable of shimming away unwanted gradients. We are designing coils to address individual magnetic component in the basis of spherical harmonics. This talk will introduce stream-function generated coils as well as a suite of coils designed using the scalar potential method. It will then cover the fabrication and validation of these coils before finally presenting their implementation as a full package for gradient correction.