Synchrotron light is conventionally defined as the emission from accelerated ultra-relativistic electric charges.
Ultra-relativistic means that the speed of the charge is extremely close to the speed of light, v ≈ c.
The first part of the book deals with introductory concepts, starting from special relativity, and moving on emission from accelerated charges, then #synchrotron emission from charges in circular and undulating trajectories.
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