Reactive Tuning of Sheared Elliptical Solenoid for Precision Neutron Beam Experiments

Because of ​the neutron's neutrality, many fundamental symmetries experiments instead exploit its magnetic moment and use precise magnetic fields to manipulate neutron beams. One implementation requirement of experimental searches for beyond Standard Model sterile (mirror) neutron oscillations is a ~10G magnetic field, tunable to arbitrary directions, and maintaining a uniformity to ~2mG.  To produce both uniform solenoidal and transverse magnetic fields we have implemented a symmetric design involving a series of three sheared elliptical solenoids layered and rotated by 2π/3 with respect to each other. I will present a mechanism by which three coils can be tuned not only to produce an arbitrary field in any direction, but also to actively compensate for small variations in background fields along the beam axis. These nonstandard wire geometries have been fully realized using 3D printing technology.