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Generation of two truncated Bessel beams by annular slits. (The first beam illuminates the gray regions, while the second one illuminates the black regions.)
(Color online) Propagation of the first (black curve) and second (gray curve) truncated beams. Red and blue curves indicate the synthesized functions and , respectively.
Five-sections acceleration mechanism: (a) total energy of the accelerated electron with respect to the distance; (b) corresponding function; and (c) function.
Acceleration evolution of off-axis injected electrons. From the most upper curve, they denote in turn the cases of on-axis, 2, 4, 6, 8, and off-axis.
Trajectories of off-axis injected electrons.
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