Superconductors can indeed be utilized to focus magnetic fields, often referred to as "flux focusers," though typically in the form of thin films rather than cylinders. The proposed design of using a superconducting cylinder with a wire coil may not be efficient for applications like Gauss guns, which typically rely on a series of electromagnets to accelerate a projectile. The idea of extending the coil's magnetic field over a larger distance with a hollow cylinder aims to simplify the operation by eliminating the need for precise timing in switching coils. However, the effectiveness of this approach remains uncertain. Overall, while superconductors have potential in magnetic field manipulation, the specific design proposed may not enhance efficiency as intended.
