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Figure 1
One of the simplest—yet conceptually correct—ways to explain synchrotron radiation properties, in this case the central emitted wavelength of an undulator of period D. (a) An electron approaches the undulator with relativistic speed. (b) `Seen' by the electron, the undulator looks like a `wave' with wavelength shrunk by the Lorentz contraction. (c) The `wave' is backscattered by the electron: this is synchrotron radiation. (d) In the laboratory, the longitudinal (relativistic) Doppler shift further decreases by ∼1/(2γ) the wavelength, which becomes ∼D/(2γ2).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 33| Part 5| September 2026|
https://doi.org/10.1107/S160057752600603X
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