Creation of a Magnetic Flux Free Environment
Original Publication Date: 1980-May-01
Included in the Prior Art Database: 2005-Feb-13
For many flux-sensitive cryogenic devices, a nearly zero field environment is essential for its proper operation. It has been found the mumetal shielding is not sufficiently effective to fully remedy this situation. Previous techniques of superconduction shieldings (e.g., cans, balloons) using the Meissner effect have been proved to be inefficient due to the flux trapped in the shields during cooling down. A simple technique for providing an extremely low field environment for cryogenic applications is proposed based on the experimental observations of flux-free belts in disk-shaped type I superconductors in a uniform applied magnetic field.