Euclid preparation - XXIX. Water ice in spacecraft Part I: The physics of ice formation and contamination

Open Access

Table 1

Temperatures of PLM elements for nominal operating conditions, a ‘warm’ comparison case, and for decontamination mode.

Common path	T_nominal	T_warm	T_decont.
Ml	117 K	123 K	220 K
M2	104 K	111 K	289 K
FoMl	123 K	128 K	220 K
FoM2	122 K	126 K	221 K
M3	122 K	129 K	220 K
Dichroic	122 K	126 K	221 K

NISP path

Corrector lens	130 K	131 K	218 K
Filter/Grism	133 K	133 K	206 K
Camera lenses	132 K	132 K	204 K
Detector	95 K	95 K	200 K

VIS path

FoM3	118 K	123 K	220 K
Detector	152 K	156 K	270 K

Structural

Baffle	100 K	108 K	205 K
PLM baseplate	120 K	125 K	207 K

Notes. The order of the components is as they appear in the optical paths towards NISP and VIS (see Fig. 5). Here ‘M’ stands for mirrors with optical power, ‘FoM’ for flat folding mirrors, and ‘L’ for lenses inside NISP. Temperatures were taken from the PLM critical design review thermal analysis report. Accurate operational values will only be known after launch and may deviate by a few kelvin from the ones tabulated here. We note that the VIS detectors are considerably warmer than their surrounding, whereas the NISP detectors are colder, which determines their contamination experience.

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