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Description
Free-electron laser (FEL) radiation is a powerful tool for a wide range of experiments and the synergy between accelerator physicists and users has led, in some cases, to the development of tailored sources with extremely interesting scientific results. Among advanced FEL schemes, a users’ favorite and successful setup for pump-probe experiments is the so called “two pulses- two colors”. In this scheme, the long undulator chain is divided into two parts, by tuning the undulators to different resonant wavelengths. The electron beam generates two pulses with distinct wavelengths, with a time delay that can be adjusted with a dispersive section between the two undulators segments. At the experimental station, these two “colors” arrive collinearly, and with the already mentioned controllable time delay. However they originate from different source points, which makes it challenging to design the refocusing optics.
In this contribution, we present simulation results showing how the source point differs for some selected setups and explore strategies for designing beamline optics that can cope with this problem.
| In which format do you inted to submit your paper? | LaTeX |
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