Table 2
Total contamination rates for the nominal and warm case (Table 1).
| Common to VIS and NISP | dz/dt (Tnominal) [nm month−1] | dz/dt (Twarm) [nm month−1] | |
|---|---|---|---|
| WMK | Sack+ (1993) | WMK | |
| M1 | −0.33 | −1.1 | −4.0 |
| M2 | 0.13 | +0.3 | +1.1 |
| FoM1 | +0.08 | −0.16 | −14 |
| FoM2 | +1.4 | +3.4 | +0.50 |
| M3 | +1.4 | +3.4 | −25 |
| Dichroic | +1.4 | +3.4 | +0.50 |
| NISP path | |||
| NISP lenses | −101 | −238 | −89 |
| Detector | +9.9 | +27 | +22 |
| VIS path | |||
| FoM3 | +3.6 | +9.6 | +9.3 |
| Detector | −44 000 | −79 000 | −122 000 |
Notes. Negative values mean that sublimation is more efficient than condensation. We note that in most related technical publications, the sublimation and condensation fluxes are given in units of g cm−2 s−1. For us the optical effects are of interest, hence we parameterise contamination rates as a change of ice thickness z.
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