Low-leakage magnetic-field magnet and shield coil assembly

Details Low-leakage magnetic-field magnet and shield coil assembly Low-leakage magnetic-field magnet and shield coil assembly

2005-06-21

2005-06-21

Scott, James R. (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

Reexamination Certificate

active

06909348

ABSTRACT:
A magnet device provided with a shield current carrying means in which two sets of magneto-static field generating sources for generating magnetic fields directed towards a first direction are disposed facing each other across a finite region and at least one set of the magneto-static field generating sources are disclosed on at least two almost concentric circles. A first plane includes a first axis, a second axis and a first point. The first point is a point of insertion between the first axis parallel to the first direction and passing almost through the center of the shield current carrying means. The second axis crosses at right angles to the first axis and is spaced almost equal distance from the two sets of the generating sources. The alternately arranged positive and negative current carrying directions of the shield current carrying means are set in the order of increasing value of θn.

REFERENCES:
patent: 5883558 (1999-03-01), Laskaris et al.
patent: 5900794 (1999-05-01), Palkovich et al.
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Kakugawa, S. et al, “A Study of Optimal Coil Configurations in a Split-Type Superconducting MRI Magnet”, IEEE Transactions on Applied Superconductivity, vol. 9, No. 2, Jun. 1999, pp. 366-369.

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