Superconducting Cable Electroplating for RF Connector Soldering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Attaching radio frequency (RF) connectors to superconducting cables is challenging due to the formation of a tough oxide layer on the metals used in these cables, which is impervious to even aggressive fluxes, and conventional crimp-type connectors do not provide reliable electrical connections, especially to the shield of coaxial cables.
Innovation Solution
A method involving electroplating a metal layer, such as copper, onto the surface of the superconducting cable after depositing an oxide layer, allowing the metal layer to adhere and enabling reliable soldering of RF connectors, using electrolytic cells with specific solutions and electrical signals to control the oxide and metal layer thickness and properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional crimp-type connectors are used to attach RF connectors to superconducting cables, then mechanical connection is achieved, but reliable electrical connections especially to the shield are not achieved
Solution Approach 1:
The patent applies preliminary action by depositing a metal layer (such as copper) onto the superconducting cable surface before connector attachment. This pre-deposited metal layer creates a reliable electrical connection interface, solving the problem where conventional crimp connectors fail to achieve good electrical contact with the cable shield and conductor.
Solution Approach 2:
The patent uses an intermediary metal layer deposited on the superconducting cable surface as a mediator between the cable and the RF connector. This intermediate metal layer facilitates reliable electrical connection, acting as a bridge that overcomes the difficulty of direct connector attachment to the superconducting material.
2Reliability
If direct soldering is performed on superconducting cables, then electrical connection is achieved, but the tough oxide layer on the cable metals prevents successful soldering
Solution Approach 1:
The patent applies preliminary action by first depositing a metal layer onto the oxide-covered superconducting cable surface before attempting soldering. This pre-deposition step creates a solder-receptive surface, solving the problem where the tough oxide layer on superconducting metals prevents successful soldering.
Solution Approach 2:
The deposited metal layer serves as an intermediary between the oxide-covered superconducting cable and the solder. This intermediate layer is solder-receptive, allowing reliable soldering connections to be made without directly contacting the oxide-resistant superconducting material.
3Reliability
If conventional metal cables are used for electrical links, then good electrical conductivity is achieved, but excessive heat flux is transferred to the cryogenic system
Solution Approach 1:
The patent applies parameter changes by transitioning from conventional metal cables to superconducting cables, which change the electrical and thermal conductivity parameters. Superconducting cables maintain good electrical conductivity while dramatically reducing electronic thermal conductivity at cryogenic temperatures, thus reducing heat flux into the cryogenic system.
Solution Approach 2:
The patent uses composite construction with superconducting materials (such as NbTi) that combine high electrical conductivity with low thermal conductivity at cryogenic temperatures. This composite material property allows the cable to function as both an excellent electrical conductor and a thermal barrier.
4Temperature
If superconducting cables are used to reduce heat flux, then thermal conductivity is reduced, but the metals form a tough oxide layer that prevents conventional connector attachment
Solution Approach 1:
The patent applies preliminary action by depositing a metal layer onto the oxide-covered superconducting cable surface before connector attachment. This pre-deposition step creates a connection-receptive surface, solving the problem where the tough oxide layer on superconducting metals prevents conventional connector attachment methods.
Solution Approach 2:
The deposited metal layer serves as an intermediary between the oxide-covered superconducting cable and the connector. This intermediate layer provides a surface that is receptive to conventional connector attachment methods, overcoming the barrier presented by the superconducting metal's oxide layer.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method allows for reliable and robust mechanical and electrical connections, maintaining the structural integrity and low thermal conductivity of superconducting cables, with the connectorized cables showing no failures under thermal cycling and mechanical tests, and achieving low reflection loss in signal transmission.
Implementation Method 1
depositing an oxide layer on a surface of a superconducting cable... The oxide layer allows the metal layer to adhere to the surface of the superconducting cable
Implementation Method 2
depositing a metal layer on the surface of the superconducting cable... soldering a connector to the metal layer coated on the surface of the superconducting cable
Data Source
AI summary
An example method for connectorizing a superconducting cable is described herein. The method can include depositing an oxide layer on a surface of a superconducting cable using a first electrolytic cell, electroplating a metal layer on the surface of the oxide layer of the superconducting cable using a second electrolytic cell, and soldering a connector to the metal layer coated on the surface of the superconducting cable. The oxide layer allows the metal layer to adhere to the surface of the superconducting cable.