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 |