AC losses in HTS multi-pancake coils made of BSCCO-tape

Losses in HTS Tapes due to AC External Magnetic Field and AC Transport Current

The E-J power law as electric characterization of the HTS material in Finite Element computations has shown good agreement with measurements of field-dependent critical current density and losses due to transport current. We use this technique to investigate the loss caused by AC transport current in self-field and in applied AC magnetic field in both rectangular monocore and multicore tapes, w...

MODELLING OF ROLLING OF SUPERCONDUCTING Ag/BSCCO TAPE

Numerical simulation of the deformation process during flat rolling of multifilament HTS tapes has been investigated using a commercial FEM program, ELFEN. The numerical models were built up in 2D and 3D using a DruckerPragerKap model for the powder. Three different roll diameters (024 mm, 0 8 5 mm and 0126 mm) have been investigated. It is found that it is possible to perform numerical simulat...

Investigations of HTS Twisted Stacked-Tape Conductor

Determination of the AC Losses of Bi-2223 HTS Coils at 77 K at Power Frequencies Using a Mass Boil-Off Calorimetric Technique

A mass boil-off measurement system has been used to accurately measure and characterize the ac loss of high-temperature superconductor (HTS) coils at frequencies between 50 and 200 Hz, and in applied ac fields of up to 0.04 T. The mass boil-off calorimeter incorporated a glass cryostat, a copper field coil, and two mass flow meters. The response of the gas flow to a step change in the applied m...

Hysteresis losses in BSCCO(2223)/Ag multifilamentary tapes

In order to investigate hysteresis losses on Ag-sheathed BSCCO(2223) multifilamentary tapes, we perform hysteresis loop measurements, with the external magnetic field He perpendicular to the tape surface, for different sweep rates of the magnetic field and at different temperatures T. The experimental results show a sweep rate dependence, equivalent to a frequency dependence of the hysteretic l...