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## Undulator
An ## Additional recommended knowledgeThe important dimensionless parameter
where c the speed of light, characterizes the nature of the electron motion. For
the oscillation amplitude of the motion is small and the radiation displays interference patterns which lead to narrow energy bands. If the oscillation amplitude is bigger and the radiation contributions from each field period sum up independently, leading to a broad energy spectrum. In this regime of fields the device is no longer called an undulator; it is called a wiggler.
Undulators can provide several orders of magnitude higher flux than a simple bending magnet and as such are in high demand at synchrotron radiation facilities. For an undulator with N periods, the brightness can be up to
If the electrons follow the Poisson distribution a partial interference leads to a linear increase in intensity. In the free electron laser the intensity increases exponentially with the number of electrons. The figure of merit is spectral radiance. |

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Undulator". A list of authors is available in Wikipedia. |