Title :
Numerical analysis of hysteretic losses on high temperature superconducting coils
Author :
Bigoni, Luigi ; Cereda, Ezio ; La Cascia, Piero ; Negrini, Franceso ; Ottoboni, Vincenzo ; Ribani, Pier L.
Author_Institution :
CESI S.p.A., Milan, Italy
fDate :
3/1/2001 12:00:00 AM
Abstract :
A model to calculate hysteretic losses in superconducting coils made of BSCCO/Ag tapes is described. The model is based on DC measurements of V-I characteristic and of the dependence of critical current of the tape from amplitude and orientation of the magnetic field. The model can be applied whenever the current direction is perpendicular to the magnetic field vector as in solenoidal and toroidal coils. In this paper, an axisymmetric system is considered and only the azimuthal component of the current density is present. A sinusoidal time dependence of the transport current is considered but a general time behavior can be easily analyzed by the model. A comparison between the calculated data and the experimental data is presented and discussed
Keywords :
bismuth compounds; calcium compounds; copper compounds; high-temperature superconductors; lead compounds; magnetic fields; magnetic hysteresis; numerical analysis; silver; strontium compounds; superconducting coils; superconducting magnet energy storage; superconducting magnets; superconducting tapes; (BiPb)2Sr2Ca2Cu3O8-Ag; (BiPb)2Sr2Ca2Cu3O8-Ag HTSC tapes; BSCCO/Ag tapes; DC measurements; V-I characteristic; axisymmetric system; critical current; current density; high temperature superconducting coils; hysteretic losses; magnetic field vector; solenoidal coils; toroidal coils; transport current; Azimuthal component; Bismuth compounds; Critical current; Current measurement; Magnetic field measurement; Magnetic hysteresis; Numerical analysis; Superconducting coils; Temperature; Toroidal magnetic fields;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
