Superconductor magnet coil configuration
View Patent ↗A superconducting magnet coil configuration comprising at least one section of a superconducting strip conductor, which is continuously wound in a cylindrical winding chamber ( 1 ) between two end flanges ( 2, 3 ) in several solenoid-like layers is characterized in that the section comprises an axial region of reduced current density (=notch region ( 10 )), and the winding layers ( 6, 9 ) have hollow cylindrical blind regions ( 4 a, 4 b, 4 c ) which are filled with filler and which have different axial lengths, and radially sequential blind regions ( 4 a, 4 b, 4 c ) each alternately abut one of the two end flanges ( 2, 3 ) and are each radially separated from each other by at least one continuous winding layer ( 7 ), wherein the axial overlapping region of the blind regions ( 4 a, 4 b, 4 c ) forms the notch region ( 10 ). The inventive device thereby realizes a magnet coil configuration comprising a strip conductor which has a notch region for correcting inhomogeneities, wherein the mechanical load on the strip conductor is minimized.
1. A superconducting magnet coil configuration comprising:
a first end flange;
a second end flange, said first and said second end flanges defining and limiting a substantially cylindrical winding chamber;
a first hollow cylindrical filler, said first filler having a first filler inside radius, a first filler outside radius, a first filler first end, and a first filler second end, said first filler second end disposed adjacent to said second end flange, said first filler defining and limiting a first winding chamber portion between said first end flange and said first filler first end;
a second hollow cylindrical filler, said second filler having a second filler inside radius, a second filler outside radius, a second filler first end, and a second filler second end, said second filler disposed within said winding chamber substantially coaxially with respect to said first filler, said second filler inside radius being greater than said first filler outside radius, wherein said second filler first end is disposed adjacent to said first end flange, said second filler defining and limiting a second winding chamber portion between said second end flange and said second filler second end, said second chamber portion disposed radially outside of said first filler; and
a superconducting strip conductor continuously wound in several solenoid like layers within said first chamber portion and within said second chamber portion and passing through an overlapping axial region between said first filler and said second filler to travel from said first chamber portion into said second chamber portion, wherein said overlapping axial region defines a notch region of reduced current density, said first filler creating a first blind region and said second filler creating a second blind region.
2. The magnet coil configuration of claim 1 , wherein said first and said second fillers have differing axial lengths.
3. The magnet coil configuration of claim 1 , further comprising at least one additional third filler disposed radially beyond said second filler to define at least one additional third blind region, wherein radially sequential blind regions alternately abut against said first and said second end flanges.
4. The magnet coil configuration of claim 1 , wherein said superconducting strip conductor is a high-temperature superconductor.
5. The magnet coil configuration of claim 4 , wherein said strip conductor contains silver-stabilized Bi—Sr—Ca—Cu oxide or YBCO.
6. The magnet coil configuration of claim 1 , wherein said notch region is axially displaced from a symmetrical configuration in such a manner that field effects of first order generated by said continuous winding layers extending between said first and said second blind regions are compensated for.
7. The magnet configuration of claim 1 , wherein a radially innermost blind region is formed in one piece with said winding chamber.
8. The magnet coil configuration of claim 1 , wherein winding layers are continuously wound between said first and said second end flanges radially outside and/or radially inside of said notch region.
9. The magnet coil configuration of claim 1 , wherein axial lengths of said blind regions are adjusted to be integer multiples of windings of said strip conductor.
10. The magnet coil configuration of claim 1 , wherein said blind regions have different axial lengths and/or radial thicknesses.
11. The magnet coil configuration of claim 1 , wherein said blind regions are designed as hollow cylinders of solid material.
12. The magnet coil configuration of claim 1 , wherein said blind regions are designed as partial shells of hollow cylinders.
13. The magnet coil configuration of claim 12 , wherein said partial shells are half-shells.
14. The magnet coil configuration of claim 1 , wherein said blind regions contain wound strips.
15. The magnet coil configuration of claim 1 , wherein said superconducting strip conductor is formed from stacked conductor strips which are electrically connected in parallel.
16. The magnet coil configuration of claim 1 , wherein the magnet coil configuration is superconductingly short-circuited.
17. The magnet coil configuration of claim 1 , wherein the magnet coil configuration is a high field NMR magnet in a center of which a highly homogeneous magnetic field is generated.