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- W3103610004 abstract "We present an alternative Corrector-ADC design for GMT. The design consists of just 3 silica lenses, of maximum size 1.51m, and includes only a single low-precision asphere for 20' field-of-view, and none for 10'. The polychromatic (360nm-1300nm) image quality is d80<0.043 at zenith and d80<0.20 for ZD<60 degrees. The monochromatic image quality is d80<0.1 everywhere, and typically ~0.05. The ADC action is achieved by tilt and translation of all three lenses; L1 and L2 via simple slide mechanisms each using a single encoded actuator, and L3 via a novel 'tracker-ball' support and three actuators. There is also a small motion of M2 via the hexapod, automatically generated by the AGWS system. The ADC action causes a small non-telecentricity, but this is much less than the unavoidable chromatic effects shared with the baseline design. The ADC action also changes the distortion pattern of the telescope, but this can be used positively, to reduce the maximum image motion due to differential refraction by a factor of three. The transmission is superb at all wavelengths, because of the reduced number of air/glass surfaces, and the use only of fused silica." @default.
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- W3103610004 date "2016-08-08" @default.
- W3103610004 modified "2023-09-23" @default.
- W3103610004 title "An all-silica three element wide-field corrector for GMT" @default.
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- W3103610004 doi "https://doi.org/10.1117/12.2234468" @default.
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