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Updated: Feb 6, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
Published on: October 11, 2016
Control of the Lasing Slice by Transverse Mismatch in an X-Ray Free-Electron Laser
Yu-Chiu Chao1, Weilun Qin1,2, Yuantao Ding1
1SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
Abstract:
We demonstrated selective slice-dependent lasing by controlling the matching to the undulator of different slices within an electron bunch. The slice-dependent mismatch was realized through quadrupole wakefield generated in a corrugated structure. A deterministic procedure based on empirical beam transport and phase space information is used to match selected slices by turns to lase in the undulator while keeping all other slices from lasing, thus staying fresh. Measurements of time-resolved electron bunch energy loss by a transverse deflecting cavity confirmed the predicted behavior.
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