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![[Figure 1]](ay5611fig1mag.jpg)
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Figure 1
Schematic drawing of the SDU showing FEL beams utilizing the Ni-coated mirrors (orange). The initially top section of the beam (green) is reflected by the beam splitter mirror (BS) downwards into the variable delay path (gray mirrors). The mirrors DL1 and DL2 can be moved along the beam path as indicated by the orange arrows and induce a temporal delay into this beam. The initially lower section of the FEL beam (red) passes the BS unreflected (see top inset) and propagates in the fixed delay path (Ni1–Ni4, orange mirrors). Both beams are recombined at the recombining mirror (RC, see lower inset). A small gap between both beam parts remains after leaving the SDU. The optical bench [gray frame, in (c)] can be moved horizontally to change the positioning from the Ni- to the Pt-coated mirrors Pt1–Pt4 (light blue). In the variable delay path the Ni and Pt coatings are evaporated side-by-side on the mirrors BS, DL1, DL2 and RC. |
![[Figure 1]](ay5611fig1.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
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