Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Superconductive type
Patent
1985-03-18
1986-06-17
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Superconductive type
335299, 324320, H01F 722
Patent
active
045958998
ABSTRACT:
Magnetic shielding of a magnet such as a first set of superconducting coils as used in nuclear magnetic resonance (NMR) applications includes a second set of coils around and spaced from the first set of coils. The magnetic flux of the second set of coils opposes and offsets the magnetic flux of the first set of coils in the region outside of the second set of coils but is less than the magnetic flux of the first set of coils in the region within the first set of coils. The uniformity of the magnetic flux within the first set of coils is not adversely affected by the magnetic flux produced by the second set of coils. In a preferred embodiment the coils of the first set are independently energized to establish a uniform field within the coils having suppressed lower order derivatives of flux with respect to position within the uniform field. The external field of the first set of coils comprises a dipole which is offset by the field of the second set of coils. Higher order multipoles beyond the dipole are also suppressed by the geometries of the two sets of coils.
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Fairbank William M.
McAshan Michael S.
Smith Todd I.
Harris George
The Board of Trustees of the Leland Stanford Junior University
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