Method for winding an embedded b-zero coil
View Patent ↗A method for winding on embedded b-zero coil maintains the integrity of superconducting main coil and the b-zero wire during coil winding and during normal operation of a superconducting MRI magnet. The b-zero coil is co-wound with an aluminum overwrap while the aluminum overwrap is being wound onto the superconducting MRI coil. The two-wire geometries are selected such that the height or thickness of the aluminum overwrap is greater than or equal to the height or thickness of the b-zero coil wire. The b-zero coil wire sits in a cavity that is created by adjacent turns.
1. A method of forming a b-zero coil ( 40 , 42 , 44 , 46 , 48 and 50 ) about a superconducting main ( 20 , 22 , 24 26 , 28 and 30 ) coil for use in magnetic resonance imaging comprising the steps of
providing a superconducting magnet coil ( 60 );
overlaying the superconducting magnet coil ( 60 ) with a layer of insulation material ( 62 );
winding a b-zero coil wire ( 70 ) into at least one layer about said insulation layer ( 62 ) to form a b-zero superconducing coil ( 40 , 42 , 44 , 46 , 48 and 50 );
co-winding with said b-zero coil wire ( 70 ) a second wire ( 80 );
wherein adjacent windings of such second wire ( 80 ) form a cavity ( 72 ) therebetween; and
wherein adjacent windings of b-zero coil wire ( 70 ) lie within such cavity ( 72 ).
2. The method of forming a b-zero coil ( 40 , 42 , 44 , 46 , 48 and 50 ) of claim 1 including the additional steps of overlaying the layer of b-zero coil wire ( 70 ) with at least one layer of second wire ( 82 ).
3. The method of forming a b-zero coil ( 40 , 42 , 44 , 46 , 48 and 50 ) of claim 2 wherein said b-zero wire ( 70 ) is made of superconducting wire.
4. The method of forming a b-zero coil ( 40 , 42 , 44 , 46 , 48 and 50 ) of claim 3 wherein said second wire ( 80 ) is made of aluminum.
5. A method of forming an embedded b-zero coil ( 40 , 42 , 44 , 46 , 48 and 50 ) about a superconducting main coil ( 20 , 22 , 24 26 , 28 and 30 ) for use in magnetic resonance imaging comprising the steps of
providing a superconducting magnet coil ( 60 );
overlaying the superconducting magnet coil ( 60 ) with a layer of insulation material ( 62 );
winding a b-zero coil wire ( 70 ) into at least one layer about said insulation layer ( 62 ) to form a b-zero superconducting coil ( 40 , 42 , 44 , 46 , 48 and 50 );
co-winding a second wire with said b-zero coil wire ( 70 );
wherein adjacent windings of such second wire ( 80 ) form a cavity ( 72 ) therebetween; and
wherein adjacent windings of b-zero coil wire ( 70 ) lie within such cavity ( 72 ).
6. The method of forming an embedded b-zero coil ( 40 , 42 , 44 , 46 , 48 and 50 ) of claim 5 wherein said winding and co-winding is controlled to provide spaces between adjacent windings.
7. The method of forming an embedded b-zero coil ( 40 , 42 , 44 , 46 , 48 and 50 ) of claim 6 including the additional step of overlaying the layer of b-zero coil wire ( 70 ) with at least one layer of second wire ( 80 ).
8. The method of forming an embedded b-zero coil ( 40 , 42 , 44 , 46 , 48 and 50 ) of claim 7 wherein said b-zero wire ( 70 ) is made of superconducting wire.
9. The method of forming an embedded b-zero coil ( 40 , 42 , 44 , 46 , 48 and 50 ) of claim 8 wherein said second wire ( 80 ) is made of aluminum.