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Left: telescope spacer design. Right: mounted SiC telescope spacer. The inset shows one of the sister blocks.
A two-stages suspension system (springs + blades) was installed in order to decouple the telescope from ground vibrations. The telescope was surrounded by polyethylene terephthalate (PET) shields in order to achieve a benign thermal environment. A 25-liter LN reservoir was thermally linked to the telescope by means of four copper rods in order to be able to cool it. Temperature sensors were attached to the spacer. The pressure was kept at ≃5×10−5 Pa.
Left: dimensional stability results at room temperature. Right: idem at −62 °C.
Temperature stability and transfer functions in the telescope. See text for details.
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