Multi-dimensional optimization of a terawatt seeded tapered Free Electron Laser with a Multi-Objective Genetic Algorithm

Published

Journal Article

© 2016 Elsevier B.V. There is a great interest in generating high-power hard X-ray Free Electron Laser (FEL) in the terawatt (TW) level that can enable coherent diffraction imaging of complex molecules like proteins and probe fundamental high-field physics. A feasibility study of producing such X-ray pulses was carried out employing a configuration beginning with a Self-Amplified Spontaneous Emission FEL, followed by a “self-seeding” crystal monochromator generating a fully coherent seed, and finishing with a long tapered undulator where the coherent seed recombines with the electron bunch and is amplified to high power. The undulator tapering profile, the phase advance in the undulator break sections, the quadrupole focusing strength, etc. are parameters to be optimized. A Genetic Algorithm (GA) is adopted for this multi-dimensional optimization. Concrete examples are given for LINAC Coherent Light Source (LCLS) and LCLS-II-type systems. Analytical estimate is also developed to cross check the simulation and optimization results as a quick and complimentary tool.

Full Text

Duke Authors

Cited Authors

  • Wu, J; Hu, N; Setiawan, H; Huang, X; Raubenheimer, TO; Jiao, Y; Yu, G; Mandlekar, A; Spampinati, S; Fang, K; Chu, C; Qiang, J

Published Date

  • February 21, 2017

Published In

Volume / Issue

  • 846 /

Start / End Page

  • 56 - 63

International Standard Serial Number (ISSN)

  • 0168-9002

Digital Object Identifier (DOI)

  • 10.1016/j.nima.2016.11.035

Citation Source

  • Scopus