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Low Electrical Noise Solderable Superconductor Connection Disclosure Number: IPCOM000034250D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27

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Bermon, S Chi, CC Rozen, JR Tsuei, CC [+details]


A technique is described whereby a solderable and strong mechanical connection is made between refractory and non-refractory superconducting wires, so as to display low electrical noise. Three fabricating steps are explained to attain superior joining of superconducting wires. Typically, niobium or niobium-titanium alloy wires display high mechanical strength and are able to operate at high critical temperatures. However, when attempting to join, either two niobium wires, or an Nb wire to a superconducting lead-tin solder surface, Nb and its alloys cannot be soldered. To obtain solderability, copper-clad Nb wire is often used, but this combination contributes significantly to excessive electrical noise in a circuit.