The AMiBA Hexapod Telescope Mount

Details The AMiBA Hexapod Telescope Mount The AMiBA Hexapod Telescope Mount

2009-02-13

arxiv.org/abs/0902.2335v1

Astrophys.J.694:1670-1684,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Accepted for ApJ, 33 pages, 15 figures

Scientific paper

10.1088/0004-637X/694/2/1670

AMiBA is the largest hexapod astronomical telescope in current operation. We present a description of this novel hexapod mount with its main mechanical components -- the support cone, universal joints, jack screws, and platform -- and outline the control system with the pointing model and the operating modes that are supported. The AMiBA hexapod mount performance is verified based on optical pointing tests and platform photogrammetry measurements. The photogrammetry results show that the deformations in the inner part of the platform are less than 120 micron rms. This is negligible for optical pointing corrections, radio alignment and radio phase errors for the currently operational 7-element compact configuration. The optical pointing error in azimuth and elevation is successively reduced by a series of corrections to about 0.4 arcmin rms which meets our goal for the 7-element target specifications.

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