Cubic coil system composed of three sets of cubic triple coils to produce wide area 0.66% uniform magnetic field in any direction.

A cubic coil system, which combines three sets of cubic triple square coils orthogonal to each other, is proposed, constructed, and tested. This coil system can generate a 0.66% (=±0.33%) uniform magnetic field in any direction over a large region of ∼2 m, although there is some ripple. This system has the advantages of easy assembly, self-standing, and easy access to internal instruments. In one set of cubic triple square coils, the outer two square coils form a cube, and the middle square coil is located at the center of the cube. The number of turns in the center square coil is proposed to be 0.6 times that of the outer square coil.

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