Six undulators have been designed and built by STI since 1980 for synchrotron and FEL applications. Several design concepts, producing successively higher fields, have been developed during this period. A wedged-pole hybrid design has been demonstrated to yield the highest field to date for a given gap-to-wavelength ratio. A simple method of reducing field errors has been demonstrated on the wedged-pole hybrid, and it may lead to significant cost reduction through relaxation of mechanical and magnet tolerances.
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Slater et al. (1989) studied this question.
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