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Table 7

Overview of analyzed and expected sources of error in mechanical pointing errors.

Pointing errors Analyzed Uncorr. Corrected Type of compensation Sect.
[″] [″]
Gravity Yes 100 1 LUT/CL 5.3, 5.4.3
Wind (3.5 m/s) Yes 0.5 0.2 CL 5.3, 5.4.3
Wind (9 m/s) Yes 3 1.5 CL 5.3, 5.4.3
Thermal (night) Yes 5 0.5 CL 5.3, 5.4.3
Thermal (day) Yes 5 1 CL 5.3, 5.4.3

Notes. While it is anticipated that the LUT approach will be sufficient to correct gravitational deformations, we include “CL” for them since the closed-loop system will be available to correct residual surface errors not amenable to the LUT approach. Abbreviations are as in Table 6. We note that the anticipated corrections are based on expectations and requirements and may evolve as the concept evolves to a construction-ready design.

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