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Choosing Rayleigh Length of Input Radiation to an Undulator

  1. Nov 29, 2011 #1
    This isn't a homework question but the professor asked us why someone would choose to set the Rayleigh length of input radiation into an undulator to be the length of the undulator, instead of setting it to be half the undulator's length like normal. The best reason I could come up with is that they didn't want the radiation energy spread to be very large, but that seems too simplistic.

    This is for a class on synchrotron radiation and free electron lasers, and we were talking about the gain in electromagnetic energy.
     
  2. jcsd
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