An experimental device for critical surfacecharacterization of YBCO tape superconductors; Experimental device for critical surfacecharacterization of yttrium barium copper oxide tapesuperconductors
2013
The twisting stacked tape cabling (TSTC) method for
YBCO superconductors is very attractive for high current density,
high magnetic field applications, such as nuclear fusion reactors
and high energy physics experiments. Industrial scale assembling
methods have been proposed, and cable samples have been tested at
77 K and 4.2 K. A new experimental device has been designed and
built to measure critical current of YBCO tapes and TSTC as a
function of magnetic field and temperature. The probe allows
controlling the temperature between 4.2 K and 80 K within +/-1 K in
liquid and gaseous helium ambient, and can be used in a 2 T magnet
facility at MIT-PSFC and a 14 T magnet facility at NHMFL-FSU. Its
current leads are designed to carry up to 5 kA. The device consists
in a 0.9 m long, 25 x 38 mm rectangular vacuum-insulated canister.
The superconducting sample and a superconducting current return
lead fit inside the canister, in such a way that the Lorentz force
and torque produced by the external magnetic field is cancelled.
The sample temperature is controlled in a 200 mm long area inside
the canister where critical current measurements are performed.
Critical current measurements were performed on a single YBCO tape
at self-field at temperatures between 20 K and 70 K. The results
are similar to data provided by the superconductor's manufacturer.
The temperature reached the set point in approximately 10 minutes,
and was controlled within +/-1 K. Results of heating power required
and difference between set point temperature and measured
temperature as functions of set point temperature are presented for
two temperature control methods.
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