5 October 2012 ALMA nutator design and preliminary performances
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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.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Pierre Martin-Cocher, Pierre Martin-Cocher, John Ford, John Ford, Patrick M. Koch, Patrick M. Koch, Chih-Wen Ni, Chih-Wen Ni, Wei-Long Chen, Wei-Long Chen, Ming-Tang Chen, Ming-Tang Chen, Philippe Raffin, Philippe Raffin, Ching-Long Ong, Ching-Long Ong, Paul T. P. Ho, Paul T. P. Ho, Arthur H. Symmes, 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); doi: 10.1117/12.925809; https://doi.org/10.1117/12.925809

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