Magic sphere providing distortion-free access to a large internal working space containing a uniform high-intensity magnetic field

A magic sphere for providing a large internal working space containing a uniform magnetic field, comprising:

• a spherical permanent magnet shell for generating the uniform magnetic field, said shell forming an internal cavity, said shell having a predetermined thickness, an inner and an outer surface, a pair of magnetic poles forming a polar axis along which the uniform magnet field is directed, and an equatorial axis transverse to said polar axis;
• a permanent magnet insert for enhancing the magnitude of the internal field, said permanent magnet insert positioned in said internal cavity adjacent to said inner surface of said shell along the circumference of said equatorial axis of said shell, said permanent magnet insert magnetized in a direction opposite to said polar axis;
• and
• a pair of passive ferromagnet caps for smoothing out any non-uniformity in the internal field, said passive caps positioned in said internal cavity at opposite ends of said polar axis adjacent to said magnetic poles of said shell such that said permanent magnet insert is positioned therebetween, said permanent magnet insert and said passive caps forming the large internal working space within said internal cavity.