The chosen optical layout aims at delivering high photon
flux on the sample. By combining a vertically collimating mirror and a focusing toroidal mirror with a 2:1 demagnification, the
optical arrangement partially compensates for aberrations introduced by
individual optical elements such that a small focused spot of high
quality is achieved.
The position along the optical axis of key components are:
Centre of ID U21
|
0 m
|
Fast Gate Valve separating Optics hutch and Front End
|
17.5 m
|
Double crystal monochromator; Si(111)
|
22 m
|
Vertically collimating mirror; Rh on single crystal Si
|
26 m
|
Focusing toroidal mirror, Rh on single crystal Si
|
27 m
|
Focal plane
|
40.5 m |
