CAMP@FLASH: an end-station for imaging, electron- and ion-spectroscopy, and pump–probe experiments at the FLASH free-electron laser

Erk, B.; Müller, J.P.; Bomme, C.; Boll, R.; Brenner, G.; Chapman, H.N.; Correa, J.; Düsterer, S.; Dziarzhytski, S.; Eisebitt, S.; Graafsma, H.; Grunewald, S.; Gumprecht, L.; Hartmann, R.; Hauser, G.; Keitel, B.; von Korff Schmising, C.; Kuhlmann, M.; Manschwetus, B.; Mercadier, L.; Müller, E.; Passow, C.; Plönjes, E.; Ramm, D.; Rompotis, D.; Rudenko, A.; Rupp, D.; Sauppe, M.; Siewert, F.; Schlosser, D.; Strüder, L.; Swiderski, A.; Techert, S.; Tiedtke, K.; Tilp, T.; Treusch, R.; Schlichting, I.; Ullrich, J.; Moshammer, R.; Möller, T.; Rolles, D.

doi:10.1107/S1600577518008585

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Figure 3
Results of the imprint measurements of the focused FLASH beam (13.5 nm, 100 fs) around the interaction point inside the CAMP end-station. The beam was attenuated to different fractions of the initial fluence using a set of filters for each longitudinal position of the PMMA-coated silicon wafer (PMMA thickness 2.5 µm). Solid symbols show beam sizes measured by PMMA imprints, empty symbols show wavefront sensor measurements, and solid lines show the results of ray-tracing calculations. The measured Rayleigh length, i.e. the path along the beam where the beam waist is smaller than $[\sqrt{2}\omega_0]$ , is about 1 mm, compared with <0.5 mm in the ray-tracing calculations.

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 25| Part 5| September 2018| Pages 1529-1540

https://doi.org/10.1107/S1600577518008585

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