Method of preloading superconducting coils by using materials with different thermal expansion coefficients
First Claim
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1. A method of manufacturing a superconducting coil, comprising the steps of:
- surrounding wire which becomes superconducting upon subsequent heating with a first reinforcing material with a thermal expansion rate;
surrounding the wire and first reinforcing material with electrical insulation;
winding the wire surrounded by first reinforcing material and electrical insulation on a winding means thereby providing a first plurality of layers with an outer layer;
winding a cable of a second reinforcing material, with a thermal expansion rate greater than the thermal expansion rate of the first reinforcing material, around the outer layer of the first plurality of layers so that a first layer of the cable of the second reinforcing material is formed around the first plurality of layers;
winding a layer of the wire surrounded by first reinforcing material and electrical insulation around the first layer of cable of the second reinforcing material;
winding a second layer of the second reinforcing material around the layer of wire around the first layer of cable of the second reinforcing material;
whereby a coil is formed;
heating the coil to a temperature greater than 300°
C. thereby making the wire superconducting; and
cooling the coil to a temperature equal to or less than room temperature;
whereby the coil is radially preloaded.
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Abstract
The invention provides a high magnetic field coil. The invention provides a preloaded compressive force to the coil maintain the integrity of the coil. The compressive force is obtained by reinforcing the coil with two materials of different thermal expansion rates and then heating the coil to 700° C. to obtain the desired compression. The embodiment of the invention uses Nb3 Sn as the conducting wire, since Nb3 Sn must be heated to 700° C. to cause a reaction which makes Nb3 Sn superconducting.
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Citations
19 Claims
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1. A method of manufacturing a superconducting coil, comprising the steps of:
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surrounding wire which becomes superconducting upon subsequent heating with a first reinforcing material with a thermal expansion rate; surrounding the wire and first reinforcing material with electrical insulation; winding the wire surrounded by first reinforcing material and electrical insulation on a winding means thereby providing a first plurality of layers with an outer layer; winding a cable of a second reinforcing material, with a thermal expansion rate greater than the thermal expansion rate of the first reinforcing material, around the outer layer of the first plurality of layers so that a first layer of the cable of the second reinforcing material is formed around the first plurality of layers; winding a layer of the wire surrounded by first reinforcing material and electrical insulation around the first layer of cable of the second reinforcing material; winding a second layer of the second reinforcing material around the layer of wire around the first layer of cable of the second reinforcing material; whereby a coil is formed; heating the coil to a temperature greater than 300°
C. thereby making the wire superconducting; andcooling the coil to a temperature equal to or less than room temperature; whereby the coil is radially preloaded. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification