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Ask Question. Asked 2 years, 5 months ago. Active 2 years, 3 months ago. Viewed 1k times. An undulator used with the wrong electron beam energy would be in effect a wiggler. Improve this question. Add a comment. Active Oldest Votes. Improve this answer. Ruslan This is exactly what I needed to know, thank you for the concise yet clear answer.
The first answer also bumps the question in the active queue and that sometimes results in a second answer.
For a complex topic like this there is certainly room for more than one answer. Magnetic fields determine the curvatures induced on the circulating particles, and therefore its path. Because this path should be confined to be within the vacuum chamber, it cannot be changed once the accelerator is built. Therefore the magnetic field of the bending magnets is fixed, and consequently the characteristics of the light they emit. However, for certain experiments, scientists need light at energy levels, or with very specific characteristics circular polarization, small divergence, high intensity, etc , that cannot be provided by bending magnets.
The solution is then to build special magnetic systems that make the electrons bend at a specific curvature radius —depending on the application— in order to produce the required light. These systems are called "insertion devices" because they are installed —in fact, they are "inserted"— into the straight sections of the Storage Ring.
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