Phase shift and radiation spectrum of a straight series of undulators.
In constructing a very long undulator it is convenient to separate the undulator into a number of sections with a constant gap distance between the sections. The properties of the radiation spectrum expected in such an undulator were investigated assuming ideal short undulators for each section. It is shown that the peak height and width of the spectrum do not deteriorate if the radiation phases of the sections are matched to each other, even with a large gap distance. This can be realized by adjusting the field strength of the three-pole wigglers installed in each gap.
Miyahara
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