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24 September 2012 An experimental VLT cryo-cooler instrumentation vibration analysis
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Cryo-coolers are widely used to provide the required temperature levels of ESO’s VLT instrumentation suite, mainly for infrared instruments and their detectors. Nevertheless, mechanical vibrations induced by these refrigerator systems became a serious issue over the last years. Especially for the extremely sensitive VLT-Interferometer even micro vibration levels can be critical. As a consequence ESO started some time ago a comprehensive vibration reduction program. Major tasks involved are the quantification of typical cryo-cooler instrument vibration levels and their impact on the VLT / VLT-I optical stability. This paper describes the design, construction and calibration of a dedicated VLT dummy instrument comprising six powerful state-of-the-art 2-stage cold heads and the subsequent comprehensive vibration measurement test campaign. As a result trendsetting cryo-cooler instrument design and operation recommendations are presented.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gerd Jakob and Jean-Louis Lizon "An experimental VLT cryo-cooler instrumentation vibration analysis", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 844638 (24 September 2012);

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