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. 2022 Feb 27;55(Pt 2):271–283. doi: 10.1107/S1600576722000826

Table 3. List of optical components located in the pre-sample vacuum vessel.

N is the total number of devices, L 1G is the distance from the upstream end of each device to the entrance of the large gate valve mounted on the front plate of the detector tank and ΔL is the length of the device.

Device N L 1G (m) ΔL (m) Opening size (mm)
Guides (m = 1) 9 24.5, 22.2, 20.2, 18.2, 16.2, 14.2, 12.2, 10.2, 8.2 2.0 60 × 150
Scrapers 11 22.2, 20.4, 18.5, 16.5, 14.5, 12.5, 10.4, 8.3, 6.3, 4.3, 2.5   66 × 156
Apertures 10 24.6, 21.8, 20.0, 18.0, 16.0, 14.0, 12.0, 10.0, 8.0, 6.0   7.5, 15, 30 at first and 60 diameter at rest
Converging collimators 12 24.6, 22.0, 20.0, 18.3, 16.3, 14.3, 12.3, 10.3, 8.3, 6.3, 4.3, 3.0, 2.2   18 openings varying, 6 to 10.6 diameter
Lens stack 1 3.0 0.08 18 openings, 10.6 diameter
Prism stack 1 2.8 0.23 6 openings, 56 × 11.6
XY slit 2 22.3, 2.4   1 to 60, 1 to 150
Polarizer 1 24.5 2.0 60 × 150
RF flipper 1 5.6 0.4 60 diameter
Shield (Pb) 3 25, 22.5, 4.6 0.1 181 × 181