Cutaway view of a short-period tunable microwave undulator showing the corrugated guiding walls (top); simulated profile of the on-axis electric field (bottom). Selected for a Synopsis in Physics.

From the article:

Experimental Demonstration of a Tunable Microwave Undulator
Sami Tantawi, Muhammad Shumail, Jeffery Neilson, Gordon Bowden, Chao Chang, Erik Hemsing, and Michael Dunning
Phys. Rev. Lett. 112, 164802 (2014)

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