Compensation for the source drift of a free-electron laser beamline by adjusting the fixed-focus constant of the grating monochromator
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作者
Xue, Chaofan; Xue, Lian; Wang, Yong; Tai, Renzhong
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刊物名称
JOURNAL OF SYNCHROTRON RADIATION
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年、卷、文献号
2025, ,
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关键词
Xue, Chaofan; Xue, Lian; Wang, Yong; Tai, Renzhong
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摘要
For large-scale free-electron laser facilities based on linear accelerators, the laser saturation point is not frequently fixed in the undulator, which will cause a longitudinal source point drift of the beamline. The longitudinal source point drift will cause an instability in the performance of the beamline, especially affecting the energy-resolving power of variable-line-spacing grating monochromators for soft X-ray beamlines. A method of adjusting the fixed-focus constant to compensate for this longitudinal source point drift is introduced in this work. Simulation results indicate that this method can effectively recover the energy-resolving power of the grating monochromator.
