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Table 11.
Surface particle contamination (PAC) and surface molecular cleanliness (MOC) requirement budgets for the most critical surfaces of Metis, at delivery and at EoL.
| Sensitive Area | PAC (ppm) | MOC (ng cm−2) | ||
|---|---|---|---|---|
| Delivery | EoL | Delivery | EoL | |
| Inverted external occulter | 3.3 | 100 | 200 | 1500 |
| Telescope UV mirrors and stops (M1, M2, IO, Lyot stop) | 3.3 | 31 | 100 | 250 |
| Telescope UV filter | 3.3 | 31 | 100 | 250 |
| UV detector window | 3.3 | 31 | 100 | 250 |
| Visible light polarimeter optics and VL detector | 3.3 | 31 | 200 | 1000 |
| Telescope interior | 3.3 | 54 | 200 | 1000 |
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