Demagnetization of a Complete Superconducting Radiofrequency Cryomodule:   Theory and Practice
  A significant advance in magnetic field management in a fully assembled superconducting radiofrequency cryomodule has been achieved and is reported here. Demagnetization of the entire cryomodule after assembly is a crucial step toward the goal of field less than 5x10-7 Tesla. An explanation of the basic physics of demagnetization as well as experimental results are presented. 
Anthony C. Crawford and Saravan K. Chandrasekaran
physics.acc-ph