An economical high-field hybrid/PM helical undulator scheme

摘要

Selected novel hybrid/permanent magnet (hybrid/PM) configurations as elements of high-field helical undulators are considered. The general approach is found to be capable of attaining on-axis magnetic field amplitudes exceeding 0.4 T for a 0.5:1.0 gap:period ratio and at least two of the configurations can be constructed exclusively out of steel and permanent magnet monoblocks. Such simplified magnetic structures can improve the effectiveness and economy of small-scale, short-period undulator designs.