Superconducting magnet systems

A superconducting magnet system for generating a uniform magnetic field, the system comprising:

• first and second sets of superconducting pucks or solenoids along each of first and second sides of the superconducting magnet system;
• third and fourth set of superconducting pucks or solenoids along each of third and fourth sides of the superconducting magnet system;
• and
• wherein at least one of the said first, second, third and fourth sets of superconducting pucks or solenoids has a magnetisation of said superconducting pucks or solenoids which varies along a longitudinal direction of said superconducting magnet system;
• wherein said variation has a waveshape which has an amplitude which increases towards an end of said superconducting magnet system;
• wherein said waveshape has the form of a ringing pulse having an amplitude which decays in a direction away from said end towards a centre of said superconducting magnet system;
• and
• wherein said waveshape defines magnetisation values of said superconducting pucks or solenoids at discrete positions at which said superconducting pucks or solenoids are located.

A method of creating a uniform magnetic field using a superconducting magnet system, the method comprising:

• providing a majority of said uniform magnetic field using
• first and second set of superconducting pucks or solenoids along each of first and second sides of the superconducting magnet system, and
• third and fourth set of superconducting pucks or solenoids along each of third and fourth sides of the superconducting magnet system;
• and
• compensating for non-uniformities of said magnetic field in a central region of said superconducting magnet system by applying a variation to a magnetisation of at least one of said first, second, third and fourth sets of superconducting pucks or solenoids along a longitudinal direction of said superconducting magnet system, wherein said variation has a waveshape which has an amplitude which increases towards an end of said superconducting magnet system, wherein said waveshape has the form of a ringing pulse having an amplitude which decays in a direction away from said end towards a centre of said superconducting magnet system, and wherein said waveshape defines magnetisation values of said superconducting pucks or solenoids at discrete positions at which said superconducting pucks or solenoids are located.