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A mounting plate for locating under a superconducting magnet structure, between the superconducting magnet structure and a supporting surface of a mobile carrier, is controllable between two different states. In a first state, the mount provides rigid attachment and precise location of the supercond

A mounting plate for locating under a superconducting magnet structure, between the superconducting magnet structure and a supporting surface of a mobile carrier, is controllable between two different states. In a first state, the mount provides rigid attachment and precise location of the superconducting magnet structure onto the supporting surface of the mobile carrier. In a second state, the mount provides vibration isolation between the superconducting magnet and the mobile carrier.

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1. A superconducting magnet structure in combination with a mounting point, wherein the mounting point is controllable between two different states; in a first state, the mounting point provides rigid attachment and precise location of the superconducting magnet structure; and in a second state, the

1. A superconducting magnet structure in combination with a mounting point, wherein the mounting point is controllable between two different states; in a first state, the mounting point provides rigid attachment and precise location of the superconducting magnet structure; and in a second state, the mounting point provides vibration isolation of the superconducting magnet structure, said mounting point comprising: a support;an anti-vibration mount mounted to the support;a rigid mount comprising a threaded drive screw passing through a complementary threaded hole in the support, arranged such that the lower extremity of the drive screw is accessible, and wherein drive screw is operable to drive a driven piece vertically past the anti-vibration mount to achieve the first state of the mounting point in which the driven piece protrudes above the anti-vibration mount, such that the superconducting magnet structure may bear upon the driven piece to provide rigid mounting; and the drive screw is operable to retract to a lower position, out of contact with the superconducting magnet structure such that the superconducting magnet structure may rest on anti-vibration mount in the second state of the mounting point. 2. A superconducting magnet structure in combination with a mounting point according to claim 1 wherein the driven piece is an extension of the drive screw. 3. A superconducting magnet structure in combination with a mounting point according to claim 1 comprising a manually operable activator that causes a transition between the first and second states. 4. A superconducting magnet structure in combination with a mounting point according to claim 3 wherein the cam mechanism comprises a ferromagnetic element linked to an actuator that is arranged to drive the rotatable cam. 5. A superconducting magnet structure in combination with a mounting point according to claim 4 comprising a return spring that urges the actuator toward a position corresponding to the lower position of the rotatable cam. 6. A superconducting magnet structure in combination with a mounting point according to claim 1 comprising a powered actuator that causes a transition between the first and second states. 7. A superconducting magnet structure in combination with a mounting point according to claim 1, comprising an alignment pin provided on an upper extremity of driven piece, which engages a complementary recess in the superconducting magnet structure. 8. A superconducting magnet structure in combination with a mounting point, wherein the mounting point is controllable between two different states; in a first state, the mounting point provides rigid attachment and precise location of the superconducting magnet structure; and in a second state, the mounting point provides vibration isolation of the superconducting magnet, said mounting point comprising: a rigid mount mounted to the support;an anti-vibration mount arranged to be driven by a threaded drive screw passing through a complementary threaded hole in the support, arranged such that the lower extremity of the drive screw is accessible, wherein drive screw is operable to drive the anti-vibration mount vertically past the rigid mount to achieve the second state of the mounting point in which the anti-vibration mount protrudes above the rigid mount, such that the superconducting magnet structure may bear upon the vibration mount; andthe drive screw is operable to retract to a lower position, such that the superconducting magnet structure may rest on rigid mount in the first state of the mounting point. 9. A superconducting magnet structure in combination with a mounting point according to claim 8 comprising a manually operable activator that causes a transition between the first and second states. 10. A superconducting magnet structure in combination with a mounting point according to claim 8 comprising a powered actuator that causes a transition between the first and second states. 11. A superconducting magnet structure in combination with a mounting point according to claim 8, comprising an alignment pin is provided on an upper extremity of rigid mount, which engages with a complementary recess in the superconducting magnet structure. 12. A superconducting magnet structure in combination with a mounting point according to claim 11, comprising a taper is provided on the rigid mount, with a complementary recess formed on the superconducting magnet structure. 13. A superconducting magnet structure in combination with a mounting point according to claim 8, comprising a taper is provided on the superconducting magnet structure, with a complementary recess formed on the rigid mount.