undulator

noun

un·​du·​la·​tor

-ātə-

plural -s

1

: one that undulates

a lovely blonde lady undulator

—Wall Street Journal

2

: a device consisting of a series of magnetic dipoles of alternating polarity into which a stream of particles (such as electrons) moving at relativistic velocity is injected to produce intense essentially monochromatic coherent synchrotron radiation at a very few wavelengths

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