spe-o-g0039 m2 tilt system design requirements document
spe-o-g0039 m2 tilt system design requirements document
spe-o-g0039 m2 tilt system design requirements document
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SPE-O-G0039<br />
revision B<br />
3.3.2.2.1 Articulation of the f/16 Secondary Mirror for fast guiding and wavefront <strong>tilt</strong> correction<br />
shall be about Set Positions anywhere within the range <strong>spe</strong>cified in section 3.1.2 above. The<br />
input power <strong>spe</strong>ctral density (PSD) profile is shown in figure 7. At 0.1 Hz, the profile has a<br />
value of 3.114 arcsecond 2 /Hz. From 1 Hz to 10 Hz, the profile has a value of 0.03114<br />
arcsecond 2 /Hz. At 200 Hz, the profile has a value of 1.946 10 -7 arcsecond 2 /Hz. The M2 Tilt<br />
System shall follow this input with a residual RMS of 0.22 arcsecond <strong>tilt</strong> motion with the<br />
input within this envelope and with an input sample rate of 200 Hz. The M2 Tilt System shall<br />
meet all other performance <strong>requirements</strong> when operated in this mode.<br />
3.3.2.3 Fast Focus Correction<br />
Figure 7: Fast Guiding and Wavefront Tilt Correction<br />
3.3.2.3.1 Articulation of the f/16 Secondary Mirror center of gravity for fast focus shall be about<br />
Set Positions anywhere within the range <strong>spe</strong>cified in section 3.1.2 above. The input PSD<br />
profile is shown in figure 8. At 0.1 Hz, the profile has a value of 15 m 2 /Hz. From 1 Hz to<br />
10 Hz, the profile has a value of 0.15 m 2 /Hz. At 200 Hz, the profile has a value of 3.75 10 -4<br />
m 2 /Hz. The M2 Tilt System shall follow this input with a residual RMS of 1.3 m focus<br />
motion. The M2 Tilt System shall meet all performance <strong>requirements</strong> when operated in this<br />
mode.<br />
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