Superconducting Plates as Magnetic Shields

The effectiveness of magnetic shielding between superconducting niobium tin plates has been studied. Shielding factors, field profiles and gradients have been established for transverse magnetic fields up to 19.5 kG. In addition, it has been found that starting with a "frozen-in" field of -19.5 kG between the plates, it is possible to return the magnetic field to +19.5 kG suitable for particle acceleration, leaving -13.3 kG between the plates to establish reverse orbit curvature. It is the purpose of this writing to set forth the details of these endeavors for possible application to future accelerator extraction systems.