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Delta undulator

A graphic of the Delta undulator showing circular, elliptical and linear polarization of light.

The side-to-side motion of electrons in a beam can be circular, elliptical, or linear, depending on the position of the Delta undulator's magnet rows. These different motions then create circular, elliptical, or linear polarization in the light pulse.

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A new device at the Department of Energy’s SLAC National Accelerator Laboratory allows researchers to explore the properties and dynamics of molecules with circularly polarized, or spiraling, light.

Electrons spiral through the Delta undulator.
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