WEOAI1
LANL, Los Alamos, New Mexico, USA
LBNL, Berkeley, California, USA
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WEOAI1 |
Controlling the Emittance Partitioning of High-Brightness Electron Beams | |
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| High-brightness photoinjectors tend to produce electron beams with equipartitioned emittances, where the transverse emittances are roughly the same as the longitudinal emittance. However, the needs of next generation X-ray free-electron lasers (XFELs) will require transverse emittances up to three orders of magnitude smaller than the longitudinal emittances. Recent work on exotic optic schemes such as flat-beam transforms (FBTs) and emittance exchangers (EEXs) has pointed to significant new opportunities for providing arbitrary control of the beam emittance partitioning. Specifically, we can use initial correlations imposed on the beam as it is formed to control the beam’s eigen-emittances, which can then be recovered later at high energy as the actual beam emittances, in a linear sense. Here we discuss FBTs, EEXs, and other, more general, schemes to arbitrarily control the eigen-emittances, including the use of nonsymplectic beamline elements after the beam has been accelerated. | ||
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Slides WEOAI1 [1.916 MB] | |