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. Author manuscript; available in PMC: 2016 May 27.
Published in final edited form as: Appl Phys Rev. 2016 Mar 24;3(1):011302. doi: 10.1063/1.4944491

FIG. 1.

FIG. 1

Evolution of emittance as a beam is focused. Each dot represents the position and angle coordinate of a trajectory. At the source (A), position and angle are not correlated. After propagating to just before the lens (B), correlation between position and angle develops. After passing through the lens, the angles are reversed (C). On propagating to the image position (D), the correlation between position and angle disappears.