A new generation of undulator magnets


An early, 42-magnetic-pole test coil of Argonne National Laboratory’s planar superconductor undulator. A planar undulator has two cores, each wound with superconducting wire, which are placed on opposite sides of the electron beam. The electron wiggles will lie in a plane, and the resulting photons will be linearly polarised. Image: Yury Ivanyushenkov

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