Abstract :
A particle beam can be shielded from external magnetic fields by ferromagnetic shields, up to a certain field strength depending on the saturation characteristics of the used shielding material. The limits of passive shielding, in terms of external flux densities and local orientations of the field, are studied. The alternative solutions, i.e. the cancelation of the external field by either actively powered coils or by using a passive superconducting shield, are also discussed. The active and passive shielding cam also be combined. As an example the proposed shielding of the HERA electron beam at the HERA-B experiment site at DESY is described
Keywords :
beam handling techniques; colliding beam accelerators; electron accelerators; electron beams; ferromagnetic materials; magnetic shielding; particle accelerator accessories; storage rings; DESY; HERA electron beam; HERA-B experiment site; accelerator beam; actively powered coils; external flux densities; field strength; local orientations; magnetic shielding; particle beam; passive ferromagnetic material; passive superconducting shield; saturation characteristics; Electron beams; Magnetic analysis; Magnetic flux; Magnetic materials; Magnetic properties; Magnetic shielding; Particle beams; Permeability; Superconducting coils; Superconducting materials;
