Method for passively shimming a magnet

Details Method for passively shimming a magnet Method for passively shimming a magnet

1995-01-17

1997-10-14

Teska, Kevin J.

Boots, shoes, and leggings

324320, 335301, G01R 3324, G01V 300

Patent

active

056778546

ABSTRACT:
A method for passively shimming a magnet having a magnetic field with an inhomogeneity and having N possible passive shim locations. The magnetic field is mapped. A function is defined related to the mapped field as affected by N shim variables of positive shim strength and M shim variables of negative shim strength. A computer optimization code is run which calculates the positive strengths of the N shim variables and the negative strengths of the M shim variables which minimizes the defined function. Positive strengths of passive shims are added to the magnet corresponding to the calculated positive strengths of the N shim variables and positive strengths of passive shims are removed from the magnet corresponding to the calculated negative strengths of the M shim variables.

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Concurrently filed U.S. Patent Application RD-24059, of Bizhan Dorri, "Method for Passively Shimming an Open Magnet".
U.S. Patent Application Serial No. 08/183,375, filed Jan. 19, 1994, of Bizhan Dorri, et al. "Apparatus and Method for Passive Shimming of a Superconducting Magnet Which Images Human Limbs".
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See "Background of the Invention" of the present patent application.

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