Aloysius, R P; Dr.Syamaprasad,U(Cochin University Of Science And Technology, December 30, 2002)
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Abstract:
The application vistas of superconductors have widened very
much since the discovery of high TC superconductors (HTS) as many of the
applications can be realised at 77 K rather than going down to 4.2 K, the
liquid He temperature. One such application is the HTS current lead which is
used to connect a superconducting system with a room temperature power
source. Minimising heat leak to the cryogenic environment is the main
advantage of introducing current leads into superconducting systems. The
properties of HTSS likes zero resistance (avoiding joule heating) and very
low thermal conductivity (minimized conductive heat transfer) make them
ideal candidates to be used as current leads. There are two forms of HTS
current leads. (i) bulk form (tube or rod) prepared either from YBCO or
BSCCO and (ii) tape form prepared from Bi-2223 multifilamentary tapes.
The tape form of current leads has many advantages with respect to the
mechanical and thermal stability related criteria. Crucial information on
various aspects of HTS current lead development are not available in the
literature as those are kept proprietary by various companies around the
world. The present work has been undertaken to tailor the properties of
multifilamentary tapes for the current lead application and to optimise the
processing parameters of the same for enhanced critical current density and
field tolerance. Also it is the aim of the present investigation is to prepare
prototype current leads engineered for operation in conduction cooled mode
and test them for operational stability
Description:
Council Of Scientific And Industrial Research [Csir]
Regional Research Laboratory
Trivandrum