Magnet arrangement for producing a field suitable for NMR in a concave region

A method for adjusting a net magnetic field at a target region using a magnet system in a nuclear magnetic resonance (“NMR”) apparatus, the method comprising:

• selecting the target region in space external to the magnet system;
• and
• generating, with the magnet system, a net magnetic field at the target region,
• wherein the magnet system comprises:
• a first magnet;
• a second magnet;
• and
• a backplane;
• the first magnet having:
• a distal surface;
• a proximal surface opposite the distal surface;
• a first lateral surface abutting the proximal and distal surfaces;
• a second lateral surface abutting the proximal and distal surfaces and opposite to the first lateral surface;
• a third lateral surface abutting the proximal and distal surfaces and adjacent to the first and second lateral surfaces;
• and
• a fourth lateral surface abutting the proximal and distal surfaces and opposite to the third lateral surface;
• the distal, proximal, first, second, third, and fourth surfaces conjoining to enclose an interior portion of the first magnet;
• the second magnet having:
• a distal surface;
• a proximal surface opposite the distal surface;
• a first lateral surface abutting the proximal and distal surfaces;
• a second lateral surface abutting the proximal and distal surfaces and opposite to the first lateral surface;
• a third lateral surface abutting the proximal and distal surfaces and adjacent to the first and second lateral surfaces;
• and
• a fourth lateral surface abutting the proximal and distal surfaces and opposite to the third lateral surface;
• the distal, proximal, first, second, third, and fourth surfaces conjoining to enclose an interior portion of the second magnet;
• and
• wherein the first magnet is located at a first position and the second magnet is located at a second position, such that a first gap is produced between the first magnet and the second magnet.