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What is Underdense Plasma Lens for Electron Beam Focusing about?

1) An experiment demonstrated focusing of a 15 MeV, 19 nC electron beam by an underdense plasma lens with a peak density of 4.9×1012 cm-3 and focal length of 1.9 cm. 2) The plasma lens focused the beam in both transverse directions simultaneously and reduced the minimum beam spot area by a factor of 23. 3) Analysis of the beam envelope evolution near the focus showed the spherical aberrations of the underdense plasma lens were lower than an overdense lens, as predicted by theory. Correlations between bea

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