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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Merriam-Webster unabridged
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