Warping harness actuator for the Thirty Meter Telescope primary mirror segments

F. Kamphues; L. Chen; D. Zhang; R. S. Yang; Josef Eder; P. Deshmukh; L. Visser; J. Geelhoed; G. P. Guizzo; A. Tubb; C. Carter; B. Smith; A. Zapata

doi:10.1117/12.2563256

14 December 2020 Warping harness actuator for the Thirty Meter Telescope primary mirror segments

F. Kamphues, L. Chen, D. Zhang, R. S. Yang, Josef Eder, P. Deshmukh, L. Visser, J. Geelhoed, G. P. Guizzo, A. Tubb, C. Carter, B. Smith, A. Zapata

Author Affiliations +

Proceedings Volume 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV; 1145150 (2020) https://doi.org/10.1117/12.2563256
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

The Thirty Meter Telescope (TMT) Primary Mirror (M1) is composed of 492 hexagonal aspheric segments. In order to compensate for residual polishing errors, installation errors, gravity effects and parasitic forces in the whiffletree support, each segment is equipped with 21 Warping Harness (WH) mechanisms, which allow low order corrections to the optical surface. The primary mirror segment aberrations after shape corrections with warping harness have been identified as the single largest error term in the Thirty Meter Telescope (TMT) image quality error budget^[1]. The WH mechanism consists of a Linear Actuator, Ball Link and a Leaf Spring with strain gauge sensor. The Warping Harness key requirements are: high positioning accuracy, 50 years operational life time with minimum maintenance, low cost, high reliability, high resolution, low hysteresis, high stability in unpowered state, large operational temperature range, low power dissipation, vacuum compatibility and survival of accidental condensing conditions. Smooth motor has developed a robust, low cost linear actuator for the TMT M1 Warping Harness. A WH Accelerated Life Cycle Test with increased temperature extremes was successfully completed. Acceleration factors were calculated with the Coffin-Manson model for temperature. Compliance with the technical requirements for the WH system has been demonstrated.

Citation Download Citation

F. Kamphues, L. Chen, D. Zhang, R. S. Yang, Josef Eder, P. Deshmukh, L. Visser, J. Geelhoed, G. P. Guizzo, A. Tubb, C. Carter, B. Smith, and A. Zapata "Warping harness actuator for the Thirty Meter Telescope primary mirror segments", Proc. SPIE 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV, 1145150 (14 December 2020); https://doi.org/10.1117/12.2563256

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
19 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Thirty Meter Telescope

Actuators

Mirrors

Accelerated life testing

Aspheric lenses

Optical calibration

Polishing

Show All Keywords

Keywords/Phrases

Search In:

Publication Years