HIGH TEMPERATURE SUPERCONDUCTING MAGNET
Systems and methods for superconducting magnets are disclosed, such systems and methods comprising a primary coil and short-circuited secondary coil. The secondary coil can be made from a stack of superconducting tapes having longitudinal cuts forming closed superconductor loops without splices. The primary coil is used to pump the current into the secondary coil where it circulates continuously generating a permanent magnetic field.
1 . A superconducting magnet system comprising:
a first conductor configured in a strip with a longitudinal cut along a portion of the first conductor;
at least one second conductor configured in a strip with a longitudinal cut along a portion of the at least one second conductor;
wherein the first conductor and the at least one second conductor are arranged in a stack and a first end of the first conductor is shorted to a first end of the at least one second conductor and a second end of the first conductor is shorted to a second end of the at least one second conductor thereby forming a closed loop;
a resistive coil; and
a yoke configured in spaced relation with the stack of the first conductor and the at least one second conductor and the resistive coil.
2 . The superconducting magnet system of claim 1 wherein the at least one second conductor comprises a plurality of conductors.
3 . The superconducting magnet system of claim 1 further comprising:
a coolant chamber cooled by a liquid coolant.
4 . The superconducting magnet system of claim 3 wherein the liquid coolant comprises liquid nitrogen.
5 . The superconducting magnet system of claim 1 wherein the first conductor and the at least one second conductor comprise tape type conductors.
6 . The superconducting magnet system of claim 1 wherein the first conductor and the at least one second conductor comprise superconductors.
7 . The superconducting magnet system of claim 1 wherein the yoke comprises:
an upper magnet assembly; and
a lower magnet assembly.
8 . The superconducting magnet system of claim 7 further comprising:
a non-magnetic filler material separating the upper magnet assembly and the lower magnet assembly.
9 . A method of manufacturing a magnet comprising:
cutting a longitudinal slit in at least two conductors, wherein the longitudinal slit is formed along a portion of each of the at least two conductors, but does not extend to either end of the at least two conductors;
assembling the at least two conductors into a stack of conductors;
shorting a first end of the at least two conductors;
shorting a second end of the at least two conductors; and
forming a coil from the stack of conductors.
10 . The method of manufacturing a magnet of claim 9 further comprising:
forming a coil support structure.
11 . The method of manufacturing a magnet of claim 9 wherein cutting a longitudinal slit in at least two conductors further comprises:
selecting a cut length according to a desired half coil perimeter.
12 . The method of manufacturing a magnet of claim 9 wherein shorting the first end of the at least two conductors comprises at least one of:
soldering the first end together and sintering the first end together; and
wherein shorting the second end of the at least two conductors comprises at least one of:
soldering the first end together and sintering the first end together.
13 . The method of manufacturing a magnet of claim 9 further comprising:
wrapping a heater wire around the coil.
14 . The method of manufacturing a magnet of claim 9 further comprising:
wrapping a Rogowski coil around the coil.
15 . The method of manufacturing a magnet of claim 9 further comprising:
assembling a secondary coil configured as a magnetic field stabilization coil.
16 . The method of manufacturing a magnet of claim 9 wherein the at least two conductors comprise superconductors.
17 . A superconducting magnet system comprising:
a first conductor configured in a strip with a longitudinal cut along a portion of the first conductor;
at least one second conductor configured in a strip with a longitudinal cut along a portion of the at least one second conductor;
wherein the first conductor and the at least one second conductor are arranged in a stack and a first end of the first conductor is shorted to a first end of the at least one second conductor and a second end of the first conductor is shorted to a second end of the at least one second conductor thereby forming a closed loop;
a secondary coil; and
a yoke configured in spaced relation with the stack of the first conductor and the at least one second conductor.
18 . The superconducting magnet system of claim 17 wherein the at least one second conductor comprises a plurality of conductors.
19 . The superconducting magnet system of claim 17 wherein the first conductor and the at least one second conductor comprise tape type conductors.
20 . The superconducting magnet system of claim 17 wherein the first conductor and the at least one second conductor comprise superconductors.