This is a pictorial guide to crystal structures and their Fourier
transforms useful for teaching diffraction physics. The examples of
structures and their Fourier transform, presented in this
tutorial, have grown from courses on diffraction physics taught at the
Departement of Crystallography in München.
Soft X-Rays and Extreme Ultraviolet Radiation
(course material from a UC Berkeley course by David Attwood).
Chapter 5 contains a nice presentation of wiggler and undulator
source characteristics.