Performance Prediction of the Fast Steering Secondary Mirror for the Giant Magellan Telescope

被引：4

作者：

Cho, Myung ^{[1
]}

Corredor, Andrew ^{[2
]}

Dribusch, Christoph ^{[2
]}

Park, Won-Hyun ^{[3
]}

Sheehan, Michael ^{[4
]}

Johns, Matt ^{[4
]}

Shectman, Stephen ^{[4
]}

Kern, Jonathan ^{[4
]}

Hull, Charlie ^{[4
]}

Kim, Young-Soo ^{[5
]}

Bagnasco, John ^{[6
]}

机构：

[1] Natl Opt Astron Observ, GSMT Program Off, 950 N Cherry Ave, Tucson, AZ 85719 USA

[2] Univ Arizona, Aerosp & Mech Engn Dept, Tucson, AZ 85721 USA

[3] Univ Arizona, Coll Optic Sci, Tucson, AZ 85721 USA

[4] GMT Project Off, Pasadena, CA 91001 USA

[5] Korea Astron & Space Sci Inst, Daejeon, South Korea

[6] Naval Postgraduate Sch, Dept Mech & Astronaut Engn, Monterey, CA 93943 USA

来源：

GROUND-BASED AND AIRBORNE TELESCOPES IV | 2012年 / 8444卷

关键词：

Extremely large telescope; GMT Secondary Mirror; optimum configuration; mirror support; image quality;

D O I：

10.1117/12.926374

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Giant Magellan Telescope (GMT) Fast-steering secondary mirror (FSM) is one of the GMT two Gregorian secondary mirrors. The FSM is 3.2 m in diameter and built as seven 1.1 m diameter circular segments conjugated 1: 1 to the seven 8.4m segments of the primary. A parametric study and optimization of the FSM mirror blank and central lateral flexure design were performed. For the optimized FSM configuration, the optical image qualities and structure functions for the axial and lateral gravity print-through cases, thermal gradient effects, and dynamic performances will be discussed. This paper reports performance predictions of the optimized FSM. To validate our lateral flexure design concept, mechanical and optical tests were conducted on test mirrors installed with two different lateral flexures.

引用

页数：13

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