The VST active primary mirror support system
2010
The 2.6-m primary mirror of the VST telescope is equipped with an active optics system in order to correct low-order
aberrations, constantly monitoring the optical quality of the image and controlling the relative position and the shape of
the optical elements. Periodically an image analyser calculates the deviation of the image from the best quality. VST is
equipped with both a Shack-Hartmann in the probe system and a curvature sensor embedded in the OmegaCAM
instrument. The telescope control software decomposes the deviation into single optical contributions and calculates the
force correction that each active element has to perform to achieve the optimal quality. The set of correction forces, one
for each axial actuator, is computed by the telescope central computer and transmitted to the local control unit of the
primary mirror system for execution. The most important element of the VST active optics is the primary mirror, with its
active support system located within the primary mirror cell structure. The primary mirror support system is composed
by an axial and a lateral independent systems and includes an earthquake safety system. The system is described and the
results of the qualification test campaign are discussed.
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