Generation of large-bandwidth x-ray free electron laser with Evolutionary Many-Objective Optimization Algorithm
arXiv:1806.04993 · doi:10.1103/PhysRevAccelBeams.22.020703
Abstract
X-ray free-electron lasers (XFELs) are cutting-edge scientific instruments for a wide range of disciplines. Conventionally, the narrow bandwidth is pursued in an XFEL. However, in recent years, the large-bandwidth XFEL operation schemes are proposed for X-ray spectroscopy and X-ray crystallography, in which over-compression is a promising scheme to produce broad-bandwidth XFEL pulses through increasing the electron beam energy chirp. In this paper, combining with the beam yaw correction to overcome the transverse slice misalignment caused by the coherent synchrotron radiation, finding out the over-compression working point of the linac is treated as a many-objective (having four or more objectives) optimization problem, thus the non-dominated sorting genetic algorithm III is applied to the beam dynamic optimization for the first time. Start-to-end simulations demonstrate a full bandwidth of 4.6% for Shanghai soft x-ray free-electron laser user facility.
References in corpus (4)
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Cited by in corpus (4)
- Multi-beam-energy operation for the continuous-wave x-ray free electron laser
- Inhibition of Current-spike Formation Based on Longitudinal Phase Space Manipulation for High-Repetition-Rate X-ray FEL
- Polarization control of an X-ray free electron laser oscillator
- Many-Objective Beam Dynamics Optimization for High-Repetition-Rate XFEL Photoinjector