Thermoelastic stability

This is a screening-level thermoelastic optical-stability gate built from the released optical STOP thermal cases. Line-of-sight stability is reported as a line-of-sight-equivalent image-motion proxy inferred from chief-ray registration shift at the released plate scale.

• Overall: PASS
• Design signature: e7299394ee064c9cc1ae90143c5a37f3f3657daab38c5a3e8f4110b675699929
• Line-of-sight requirement: 0.400000 arcsec
• Focus-shift requirement: 400.000 um
• Thermoelastic WFE requirement: 45.000 nm RMS

Thermal cases

Hot

• Source case: hot_contaminated_85_0_1.50
• LOS-equivalent drift: 0.011664 arcsec
• Refocus demand: 56.348 um
• Equivalent WFE proxy: 8.139 nm RMS
• Secondary axial shift: -4.563 um
• Detector focus shift: 18.297 um
• Secondary-primary delta: -3.092 K
• Focal-plane-structure delta: 11.049 K

Cold

• Source case: cold_nominal
• LOS-equivalent drift: 0.005178 arcsec
• Refocus demand: 8.681 um
• Equivalent WFE proxy: 1.254 nm RMS
• Secondary axial shift: 0.631 um
• Detector focus shift: 13.943 um
• Secondary-primary delta: 0.000 K
• Focal-plane-structure delta: 8.420 K

Checks

• optical_stop_design_signature_present: PASS
• thermal_cases_present: PASS
• worst_hot_case_line_of_sight_within_requirement: PASS
• worst_hot_case_focus_shift_within_requirement: PASS
• worst_hot_case_wfe_within_requirement: PASS
• worst_cold_case_line_of_sight_within_requirement: PASS
• worst_cold_case_focus_shift_within_requirement: PASS
• worst_cold_case_wfe_within_requirement: PASS

Sanity-check guidance

• stability_envelope.png should show hot and cold LOS bars comfortably below the 0.4 arcsec line and focus bars in the tens-to-low-hundreds of micron range, not millimetres or zeros from a broken conversion.
• thermal_distortion_breakdown.png should show the hot case carrying the larger secondary/focal thermal deltas and the larger thermoelastic distortion terms, without any sign flip that contradicts the reported case temperatures.