Sensitivity analysis of test methods for aspheric off-axis mirrors |
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Authors: | Ki-Beom Ahn Young-Soo Kim Sungho Lee Kwijong Park Jaemann Kyeong Byeong-Gon Park Chan Park A-Ran Lyo In-soo Yuk Moo-Young Chun |
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Institution: | 1. Korea Astronomy and Space Science Institute, Yuseong, Daejeon 305-348, Republic of Korea;2. Space Optics Laboratory, Dept. of Astronomy, Yonsei University, Seodaemun, Seoul 120-749, Republic of Korea |
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Abstract: | Following the Hubble Space Telescope (HST), the next generation James Webb Space Telescope (JWST) is being developed to be launched in a few years. JWST will be a segmented mirror telescope with a design much like that developed for ground-based telescopes over the past 20 years. Several segmented mirror telescopes are currently in operation, and next generation ground-based telescopes of the 30-m class are also being designed using segmented primary mirrors. Regardless of size, segmented primary mirror telescopes often require the use of aspheric segment mirrors. One of the key factors in fabrication of aspheric segment mirrors is feasibility of testing off-axis surfaces with high accuracy. A couple of test methods have been investigated for aspheric off-axis segments. As a case study, we apply these test methods to secondary segmented mirror models of the Giant Magellan Telescope. We derive required dimensions of test set-ups and assess sensitivity of optical alignment. Characteristics of the test methods are also discussed. |
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