Performance prediction of the fast steering secondary mirror for the Giant Magellan Telescope

摘要

The Giant Magellan Telescope (GMT) Fast-steering secondary mirror (FSM) is one of the GMT two Gregoriansecondary mirrors. The FSM is 3.2 m in diameter and built as seven 1.1 m diameter circular segments conjugated 1:1 tothe seven 8.4m segments of the primary. A parametric study and optimization of the FSM mirror blank and centrallateral flexure design were performed. For the optimized FSM configuration, the optical image qualities and structurefunctions for the axial and lateral gravity print-through cases, thermal gradient effects, and dynamic performances will bediscussed. This paper reports performance predictions of the optimized FSM. To validate our lateral flexure designconcept, mechanical and optical tests were conducted on test mirrors installed with two different lateral flexures.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.