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Figure 4
Using an FEL photon energy of 92 eV and a pulse energy of ∼60 µJ (120 µJ at BDA-GMD), 90 fs pulse length and 92 eV photon energy, charge states of xenon up to 22+ have been observed in the focus. (a) Xenon time-of-flight spectrum measured in the focus of the CAMP end-station (z = 0.00mm). (b) Moving the spectrometer, with a limited acceptance, along the FEL beam in the range −0.25 mm to +1.00 mm shows significant changes in the yields of high charge states of xenon, demonstrating the strong divergence of the beam and its effect on non-linear intensity-dependent effects.

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