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This article reviews insertion devices (IDs) — wigglers and undulators — both for synchrotron radiation production and for machine parameter control. As there are many types of wigglers and undulators and it is impossible to describe them all in detail, here we particularly emphasize the design, characteristics and tolerances of undulators for free electron lasers and damping wigglers for controlling beam damping parameters. The influence of periodic IDs on beam parameters in cyclic accelerators is described in brief. A profound description of different ID types can be found in [1].

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