Abstract
Microbunch Rotation and Coherent Undulator Radiation from a Kicked Electron Beam
Highlights
The unprecedented brightness and coherence of x-ray free-electron lasers (FELs) has enabled new research in physics, chemistry, and biology at the characteristic length and timescales of atomic and molecular phenomena [1,2]
The microbunch tilt at Linac Coherent Light Source (LCLS) is expected to be most pronounced in the soft x-ray region, so we compare the predictions of the previous section with data acquired during a 530 eV experiment and matching GENESIS simulations
We have presented experimental evidence that microbunches can rotate toward the new direction of travel when the electron beam is simultaneously diverted and defocused
Summary
The unprecedented brightness and coherence of x-ray free-electron lasers (FELs) has enabled new research in physics, chemistry, and biology at the characteristic length and timescales of atomic and molecular phenomena [1,2]. It is generally understood that a transverse kick does not change the microbunch orientation, and suppresses the coherent radiation emitted in the direction of the electron motion [14,15] This understanding has been formalized into a theory of far-field radiation from a kicked beam [16,17], but is inconsistent with Delta undulator experiments. Another explanation has been offered, that the conventional theory of radiation from charges is inconsistent with relativity, and that “the orientation of the microbunching wave front in the ultrarelativistic asymptotic is always perpendicular to the electron beam velocity” [18,19,20]. We conclude with a demonstration of applications for this effect, including the potential for significant improvement in multiplexing at soft and hard x-ray FEL facilities, microbunch preservation through hundreds of microradians of bend, and x-ray beams with a pulsefront tilt
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