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A magnetic field source is provided comprising a support structure upon which is positioned a conducting surface path of superconductor material. The support structure has an at least partially radially overlapping layer of material arranged in a spiral. A corresponding conducting surface path of su

A magnetic field source is provided comprising a support structure upon which is positioned a conducting surface path of superconductor material. The support structure has an at least partially radially overlapping layer of material arranged in a spiral. A corresponding conducting surface path of superconductor material is arranged on the surface of the support structure such that the conducting path has a first point for the introduction of current and a second point for the extraction of current.

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1. A magnetic module for use as a module in a magnetic resonance system comprising a modular array arranged such that a combined field being of sufficient uniformity to enable a magnetic resonance procedure to be performed is created in a working volume comprising: a primary magnetic field source an

1. A magnetic module for use as a module in a magnetic resonance system comprising a modular array arranged such that a combined field being of sufficient uniformity to enable a magnetic resonance procedure to be performed is created in a working volume comprising: a primary magnetic field source and a secondary magnetic field source each comprising a support structure upon which is defined a conducting surface path of superconductor material;wherein said primary and secondary sources are adapted such that the respective conducting surface paths are operable to be independently energized with electric current to provide a primary and a secondary magnetic field respectively;the primary and secondary magnetic field sources are arranged such that the primary magnetic field provided by the primary source can be adapted by adjusting the secondary magnetic field provided by independently energising the secondary source and wherein the primary and secondary magnetic field sources are arranged such that the secondary magnetic field source is operable to modify the absolute field strength of the primary magnetic field when independently energised with electric current; andwherein the support structure comprises an at least partially radially overlapping layer of the super conductor material arranged in a spiral wherein the conducting surface path of super conductor material is arranged on the surface of the support structure such that the conducting path has a first point for the introduction of current and a second point for the extraction of current. 2. A magnetic module according to claim 1 wherein the primary magnetic field source and/or the secondary magnetic field source comprises a magnetic field source. 3. A magnetic module according to claim 1 wherein the primary magnetic field source and/or the secondary magnetic field source comprises a curvilinear closed support surface and the corresponding conducting surface path of superconductor material comprises one or more continuous conducting surface defined paths arranged on the curvilinear surface. 4. A magnetic module according to claim 3 wherein the curvilinear closed support surface is a cylinder or a truncated cone. 5. A magnetic module according to claim 1 wherein said primary and secondary sources are arranged co-axially along the axis of radial symmetry. 6. A magnetic module according to claim 1 wherein said primary source is at least partially surrounded by said secondary source. 7. A magnetic module according to claim 1 wherein said primary magnetic source comprises at least one magnetic field source and said secondary magnetic source comprises a curvilinear closed support surface having one or more continuous conducting surface defined paths arranged on the curvilinear surface. 8. A magnetic module according to claim 1 wherein the primary and secondary magnetic field sources are arranged such that the primary magnetic field can be adapted by the secondary magnetic field to adjust the direction of the primary magnetic field. 9. A magnetic module according to claim 8 wherein the secondary magnetic field source is located such that its axis of radial symmetry is displaced radially relative to the axis of radial symmetry of the primary magnetic field source while having the same principal direction of magnetisation as the primary field source. 10. A magnetic module according to claim 9 wherein the secondary magnetic field source comprises two curvilinear support surfaces having a conducting surface path and the two curvilinear support surfaces are displaced symmetrically about the axis of radial symmetry of the primary magnetic field source and have the same principal direction of magnetisation as the primary field source. 11. A magnetic module according to claim 9 wherein the secondary magnetic field source comprises a curvilinear support surface and the primary magnetic field source comprises a plurality of magnetic field sources. 12. A magnetic module according to claim 8 wherein the secondary magnetic field source has a principal direction of magnetisation that intersects the principal direction of magnetisation of the primary magnetic field source. 13. A magnetic module according to claim 12 wherein the magnetic origins of the first and second magnetic field sources are separated either or both with respect to a vector component of their common radial directions relative to the vector component of their common axial directions of rotational symmetry or with respect to the vector component of their common axial direction of rotational symmetry. 14. A magnetic module according to claim 12 wherein said first magnetic field source comprises at least one magnetic field source and the secondary magnetic field source comprises a curvilinear closed support surface having one or more continuous conducting surface defined paths arranged on the curvilinear surface. 15. A magnetic module according to claim 12 wherein the secondary magnetic field source comprises a plurality of magnetic field sources displaced orthogonally from a common origin. 16. A magnetic module according to claim 1 wherein said superconductor material comprises a high temperature superconductor (HTS) thin film. 17. A magnetic module according to claim 1 wherein said superconductor film provides superconductivity above a temperature of 23° Kelvin. 18. A magnetic module according to claim 16 wherein said thin film is deposited on the surface of support structure by, for example, any or all of chemical vapour deposition, pulsed laser deposition or metal-organic deposition. 19. A magnetic module according to claim 1 wherein said superconducting material is an inter-metallic low temperature filamentary conductor comprising superconducting joints for connecting the first and second point to a current supply. 20. A magnetic module according to claim 1 wherein either or both of said first and second magnetic field sources may further comprise ferromagnetic material arranged to enhance the magnetic field of said sources. 21. A magnetic module according to claim 1 wherein the conducting surface path of either or both of said first and second magnetic field sources comprises a defined first and second point comprising termination pads deposited on the conducting surface path such that the first and second point are operable to be connected to a conventional conductor for supplying current. 22. A magnetic resonance system comprising a plurality of magnetic modules as set out in claim 1 arranged in an array such that the magnetic fields of the magnetic modules combine within a working volume to define a field having a magnetic field direction defining a main field axis and being of sufficient uniformity to enable a magnetic resonance procedure to be performed on a target object when placed within the working volume. 23. A magnetic resonance system according to claim 22 wherein the magnetic modules are arranged such that the magnetic moments of the modules form a curvilinear array. 24. A magnetic resonance system according to claim 22 wherein the magnetic modules are arranged in a Halbach array around the working volume. 25. A magnetic resonance system according to claim 22 wherein further comprising programmable power supply means comprising a plurality of power supply units and operable to be programmed with instructions to control current supply to the magnetic modules of the array; and a cryo-resistive network comprising resistive bus-bars operable to connect the programmable power supply means to the magnetic modules such that the primary and secondary field sources of the modules in the array are independently energised by electric current from the programmable power supply means. 26. A magnetic field source according to claim 1 wherein the support structure comprises a flat spiral such that the radius of the support structure increases as a function of angular distance subtended from an origin. 27. A magnetic field source according to claim 26 wherein the functional relationship between the radius and angular distance is such that the support structure defines a radially expanding circular loop. 28. A magnetic field source according to claim 27 wherein the functional relationship between the radius and the angular distance is such that the support structure defines a radially expanding race track having two straight sides of equal length and semi-circular end portions.