Speaker
Description
Recent experiments at the PAL-XFEL hard X-ray beamline have reported that X-ray microscopy measurements performed with an XFEL beam of 10 keV fundamental photon energy exhibit a significantly improved signal-to-noise ratio when using self-seeded FEL pulses compared to SASE FEL pulses. A possible explanation suggested in those studies is that self-seeded FELs produce substantially lower background signals arising from high-harmonic radiation than SASE FELs. In this presentation, we aim to clarify the underlying reasons for this behavior by investigating the harmonic radiation generated in the PAL-XFEL hard X-ray undulator line. We present GENESIS simulation results of harmonic emission for both SASE and self-seeded FEL configurations over a range of fundamental photon energies. In addition, we report experimental results of the second and third harmonics obtained using a double-crystal monochromator at a fundamental photon energy of 5 keV.
| Paper status | No proceeding expected for this contribution. |
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