Tunable segmented ring magnet and method of manufacture

Details Tunable segmented ring magnet and method of manufacture Tunable segmented ring magnet and method of manufacture

1984-04-23

1985-08-27

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

335212, 335298, 250396ML, H01F 702

Patent

active

045381305

ABSTRACT:
A segmented permanent ring magnet which is tunable to provide a preselected transverse magnetic field within the magnet interior is disclosed. The permanent magnet is constructed of material which has essentially linear behavior in the second quadrant of the B-H curve. The invention includes a method of tuning a segmented permanent ring magnet and a method of manufacture for the blocks of magnetic material which make up the magnet. The magnets of the present invention are particularly adapted for use as bias magnets in NMR imaging systems.

REFERENCES:
patent: 2854607 (1958-09-01), Niklas et al.
patent: 3623151 (1971-11-01), Ikeuchi
patent: 3671895 (1972-06-01), Aucouturier et al.
patent: 4429229 (1984-01-01), Gluckstern
N. V. Lazarev, V. S. Skachkov, 1979 Linear Accelerator Conference, The Tipless Permanent Magnet Quadrupole Lenses, Institute for Theoretical and Experimental Physics-Moscow, USSR.
Klaus Halback, Perturbation Effects in Segmented Rare Earth Cobalt Multipole Magnets, Lawrence Berkeley Laboratory, Univ. of California, Berkeley, CA, LBL-13221, Exhibit 10, pp. 1-8.
R. D. Hay, C. G. Masi, A Variable Strength Permanent Magnet Dipole, New England Nuclear Corporation, Chelmsford, MA 01824, U.S.A., Exhibit 13, pp. 84-86.

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