  Stacks of high-temperature superconducting tape annuli can be used as
magnetic shields operating efficiently for both axial and transverse fields.
However, due to their layered geometry and hybrid electrical and magnetic
properties, implementing models of such structures is not straightforward. In
this work, we propose two different modelling approaches with the finite
element method: layered and homogenized. We compare their accuracy and
numerical efficiency for three different formulations (h-phi, h-phi-b, and
a-j), in both axial (2D-axisymmetric) and transverse (3D) configurations. We
show that both approaches lead to comparable performance in the axial case, but
that the homogenized model is considerably harder to use in the transverse
case.
