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Figure 1
Schematic beam path of DESC (top view). For better visibility, the angle α between the incoming and reflected beam is exaggerated (in reality α = 0.7° and the distance between mirrors M1 and M3 is 1166 mm). DESC is activated by jointly moving M1 and M2 (gray box) into the incident FEL-beam (along the x-axis), which is then split into two parts. Mirror M1 is fixed along the z-axis, M2 is installed on two linear stages (short- and long-range) for delaying one part of the beam (yellow) with respect to the other (green). The red dashed lines illustrate the optical path difference. Both beams are reflected in the downstream direction (towards the KB optics and experimental chamber) by a third multilayer mirror M3, with a parallel (x-)offset (indicated by the dashed-dotted arrow) with respect to the incident direct FEL-beam (SDU not active). All mirrors can be adjusted in pitch and tilt (cf. §3.4[link]).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 25| Part 5| September 2018| Pages 1517-1528
https://doi.org/10.1107/S1600577518006094
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