Magnetic field shaper

Details Magnetic field shaper Magnetic field shaper

1991-02-05

1992-07-14

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Superconductive type

335296, 505879, H01F 100

Patent

active

051306867

ABSTRACT:
The coil of a solenoid has a pair of cylindrical, superconductive bands ped coaxially about its exterior. The bands are mounted for movement axially along the outer surface of the coil. The bands are used to shape and redirect the flux lines of the solenoid. The bands are placed near the midpoint of the coil. Sufficient current is applied to the coil to immerse the bands in a field greater than the critical field Hc, thereby switching off the superconductive state of the bands and causing flux lines from the coil to intersect the bands. Next, the field is reduced below the critical field Hc, switching on the superconductive state of the bands. The bands are then moved to the ends of the coil, reshaping the field of the solenoid into a more uniform configuration as they move. In an alternate embodiment, the superconductive state of the bands is switched on by lowering their temperature below the critical temperature while the coil is producing its desired or working field.

REFERENCES:
patent: 4969064 (1990-11-01), Shadowitz

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