Computation of screening currents in superconducting persistent current devices

The penetration of screening currents induced in a hollow superconducting cylinder exposed to transverse magnetic field is calculated two-dimensionally using a numerical model which simulates the superconductor by a system of parallel wires. Assuming the critical state model and taking account of the dependence of critical current density on magnetic field, the penetration depth and local current density is computed. (7 refs).