90
5 Flux Pinning Phenomena
Fig. 5.19 Change in the AC
loss energy density predicted
by the critical state model
when the diameter of the
superconductor is changed.
The dashed and dot-dashed
lines are the losses when the
diameter is halved and
doubled, respectively
Fig. 5.20 Change in the loss
energy density in a
transverse AC magnetic
field with change in the
filament diameter for Nb-Ti
composite superconductor
[8]. The dashed line is the
prediction of the critical state
model for d f = 0.51 μm