ALMA nutator design and preliminary performances

Pierre Martin-Cocher; John Ford; Patrick M. Koch; Chih-Wen Ni; Wei-Long Chen; Ming-Tang Chen; Philippe Raffin; Ching-Long Ong; Paul T. P. Ho; Arthur H. Symmes

doi:10.1117/12.925809

5 October 2012 ALMA nutator design and preliminary performances

Pierre Martin-Cocher, John Ford, Patrick M. Koch, Chih-Wen Ni, Wei-Long Chen, Ming-Tang Chen, Philippe Raffin, Ching-Long Ong, Paul T. P. Ho, Arthur H. Symmes

Author Affiliations +

Proceedings Volume 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI; 845221 (2012) https://doi.org/10.1117/12.925809
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

We report the past two years of collaboration between the different actors on the ALMA nutator. Building on previous developments, the nutator has seen changes in much of the design. A high-modulus carbon fiber structure has been added on the back of the mirror in order to transfer the voice coils forces with less deformation, thus reducing delay problems due to flexing. The controller is now an off-the-shelf National Instrument NI-cRIO, and the amplifier a class D servo drive from Advanced Motion Controls, with high peak power able to drive the coils at 300 Volts DC. The stow mechanism has been totally redesigned to improve on the repeatability and precision of the stow position, which is also the reference for the 26 bits Heidenhain encoders. This also improves on the accuracy of the stow position with wind loading. Finally, the software, written largely with National Instrument's LabView, has been developed. We will discuss these changes and the preliminary performance achieved to date.

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Pierre Martin-Cocher, John Ford, Patrick M. Koch, Chih-Wen Ni, Wei-Long Chen, Ming-Tang Chen, Philippe Raffin, Ching-Long Ong, Paul T. P. Ho, and Arthur H. Symmes "ALMA nutator design and preliminary performances", Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 845221 (5 October 2012); https://doi.org/10.1117/12.925809

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KEYWORDS

Mirrors

Servomechanisms

Control systems

Computer programming

Actuators

Control systems design

Field programmable gate arrays

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