Primary Mirror Segmentation Studies for the Thirty Meter Telescope

被引：13

作者：

Baffes, Curtis ^{[1
]}

Mast, Terry ^{[2
]}

Nelson, Jerry ^{[2
]}

Ponslet, Eric

Stephens, Vince ^{[3
]}

Stepp, Larry ^{[4
]}

Williams, Eric C. ^{[4
]}

机构：

[1] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA

[2] Univ Calif Santa Cruz, Ctr Adapt Opt, Santa Cruz, CA 95064 USA

[3] HYTEC Inc, Los Alamos, NM 87544 USA

[4] TMT Observatory Corp, Pasadena, CA 91107 USA

来源：

ADVANCED OPTICAL AND MECHANICAL TECHNOLOGIES IN TELESCOPES AND INSTRUMENTATION, PTS 1-3 | 2008年 / 7018卷

基金：

加拿大自然科学与工程研究理事会; 美国国家科学基金会; 加拿大创新基金会;

关键词：

mirror; segment; segmentation; deformation; optics; correction; scaling; projection; irregularity;

D O I：

10.1117/12.790206

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

The Thirty Meter Telescope (TMT) project, a partnership between ACURA, Caltech, and the University of California, is Currently developing a 30-meter diameter optical telescope. The primary mirror will be composed of 492 low expansion glass segments. Each segment is hexagonal, nominally measuring 1.44m across the corners. Because the TMT primary mirror is Curved (i.e. not flat) and segmented With uniform 2.5mm nominal gaps, the resulting hexagonal segment outlines cannot all be identical. All segmentation approaches Studied result in some combination of shape and size variations. These variations range from fractions of a millimeter to several millimeters. Segmentation schemes for the TMT primary mirror are described in some detail. Various segmentation approaches are considered, with the goal being to minimize various measures of shape variation between segments, thereby reducing overall design complexity and cost. Two radial scaling formulations are evaluated for their effectiveness at achieving these goals. Optimal tuning of these formulations and detailed statistics of the resulting segment shapes are provided. Finally, we present the rationale used for selecting the preferred segmentation approach for TMT.

引用

页数：15