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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 18 — Jun. 20, 2010
  • pp: 3485–3498

Feasibility studies for the alignment of the Thirty Meter Telescope

David C. Zimmerman  »View Author Affiliations

Applied Optics, Vol. 49, Issue 18, pp. 3485-3498 (2010)

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The Alignment and Phasing System (APS) of the Thirty Meter Telescope (TMT) is an instrument that will be responsible for aligning the primary, secondary, and tertiary mirrors of TMT. The telescope and APS are modeled with a ray tracing simulation program. Various sets of initial conditions and alignment procedures are simulated, and results are compared to the image quality specifications for the telescope. A key factor in alignment quality is the rotation of the flat tertiary mirror (M3), which rotates to serve the science instruments. The procedures that use only APS measurements yield unacceptably large image diameters, while procedures that use measurements from APS and another WFS at a different location result in telescope alignments that produce acceptable image diameters at the 90% confidence level. These two-sensor procedures can separate M3 errors from errors on other mirrors better than APS-only procedures. However, APS-only procedures should be adequate for the restricted configurations of instruments available at first light. In general, APS-only procedures should also be capable of maintaining the alignment produced initially by the more complex two-sensor procedures.

© 2010 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(010.1330) Atmospheric and oceanic optics : Atmospheric turbulence
(010.7350) Atmospheric and oceanic optics : Wave-front sensing
(080.0080) Geometric optics : Geometric optics
(110.6770) Imaging systems : Telescopes
(350.1260) Other areas of optics : Astronomical optics

ToC Category:
Atmospheric and Oceanic Optics

Original Manuscript: March 15, 2010
Manuscript Accepted: April 13, 2010
Published: June 11, 2010

David C. Zimmerman, "Feasibility studies for the alignment of the Thirty Meter Telescope," Appl. Opt. 49, 3485-3498 (2010)

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