The GREGOR dome, pathfinder for the EST dome
2012
The completely open-foldable dome of the GREGOR telescope is a further development of the DOT dome, respectively
9 and 7 meter in diameter. New technical developments are implemented and tested at the GREGOR dome, that are
important for the design of the much larger dome for the EST, which will be 28 meter in diameter. The GREGOR dome
is the first with more than one clamp working simultaneously for closing the dome and bringing the membranes on the
required high tension for storm resistance. The storm Delta with 245 km/h 1-minute mean maximum at the location of
the GREGOR gave no problems nor did the storms afterwards. Opening and closing experiences are up to wind speeds
of 90 km/h without problems. Good observing circumstances never occur with higher wind speeds. A double layer of
membranes is applied in the GREGOR construction whereas the DOT dome is equipped with a single layer.
Simultaneous climate measurements inside and outside the dome have proven the thermal-insulation capability of this
double-layer construction. The experiences with the GREGOR showed that the elongation by tensioning of the prestrained
membrane material is much lower than originally expected. In the meantime, more strong and stiff membrane
material is available and applied in the EST design. As a consequence, the clamps of the EST can have a relatively much
shorter length and there is no need anymore for simultaneous operation of the clamps and the main actuators in low
speed with help of a frequency inverter. The clamps can close after the main bow operation is finished, which simplifies
the electrical control.
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