Superimposing a 1/3 subharmonic field on a low-K undulator enhances the 5th and 7th harmonics, enabling high photon flux in the 16-22 keV range with a 3.5 GeV beam.
Calvi, et al., GdBCO bulk superconducting helical undulator for x-ray free-electron lasers, Physical Review Research, 5 (2023) L032020
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High Harmonic Radiation from a Low-K Biharmonic Planar Undulator
Superimposing a 1/3 subharmonic field on a low-K undulator enhances the 5th and 7th harmonics, enabling high photon flux in the 16-22 keV range with a 3.5 GeV beam.