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Contribution for the Optimization of the Design and Manufacture of Low-Resistance Short-Circuited Superconducting Coils
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The present dissertation intends to contribute to the optimization process of the design
and manufacture of low-resistance short-circuited superconducting coils in an architecture
developed in Department of Electrical Engineering of Faculdade de Ciências e
Tecnologia (DEE-FCT) of the Universidade NOVA de Lisboa.
The design optimization of the previously proposed coil architecture is carried out in
this work. After validation of the new design, the superconducting tapes are cut through
two different methods, i.e. by water jet and punching. The critical current of the tapes is
measured to assess the quality of the cut made and the preservation of the superconducting
properties of the tapes.
The most suitable method to perform the joint of the coils is determined by measuring
the contact resistance at the joints using different solder materials and configurations.
Prototypes of coils with 4 and 8 turns are constructed, and an experimental test for the
determination of the critical currents through the induction of superconducting currents
into the coils is carried out.
It is concluded that the water jet is very aggressive to cut the tapes and difficult to
adapt to large tape lengths using the current conventional machines. It is verified a better
aptitude of the punching method through a cutting machine adaptable to the various
moulds and lengths, conditioned by the fact that it is currently a restricted access process.
Some suggestions are made for future works which do not exhaust in this dissertation.
Descrição
Palavras-chave
High-Temperature Superconductors Coated Conductors Short-Circuited Coils Low-Resistance Joints Critical Current Density