Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Temperature-responsive type
Patent
1988-07-20
1989-05-23
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Temperature-responsive type
335301, 324318, H01F 500
Patent
active
048334340
ABSTRACT:
A superconducting electromagnet for nuclear magnetic resonance imaging has a pair of Z gradient coils surrounded by a heat shield. The heat shield comprises an electrically-conducting tube having one or more cylindrical portions which have longitudinal slits formed therein and at least two annular portions which do not have slits and which are integral with the cylindrical portions. The annular portions are inductively coupled with the Z gradient coils. The axial positions of the centers of the annular portions are selected such that the sum of the cubic term in the expression for the magnetic field generated by eddy currents which are induced in the annular portions and the cubic term in the expression for the magnetic field generated by the Z gradient coils is equal to zero. The resulting composite magnetic field varies substantially linearly along the longitudinal axis of the electromagnet.
REFERENCES:
patent: 2172733 (1939-09-01), Federmann et al.
patent: 4794338 (1988-12-01), Roemer et al.
Harris George
Mitsubishi Denki & Kabushiki Kaisha
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