un·du·la·tor | \ -ātə- \
plural -s

Definition of undulator 

1 : one that undulates a lovely blonde lady undulatorWall 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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