Resonant Waveguide Undulator Cutoff taper L u =1-2 m Instead of increasing the field by operating close to the cutoff frequency of the waveguide undulator one creates a resonant Line Tuning the radiation wavelength is done through tuning K between 0.5 to 1 for example: Undulator frequency= 2.856 GHz Mode: TE 11 Waveguide Radius=3.22 cm Radiation spectrum from 705 eV -940eV (K~ 0.5-1) Power/feed @ K=11.1 MW (two feeds for two polarizations) The circulating power within the undulator ~569 MW With the use of nonstandard frequency (~1.905 GHz) one can reduce the power/feed to about 5 MW.
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