An experimental VLT cryo-cooler instrumentation vibration analysis

Gerd Jakob; Jean-Louis Lizon

doi:10.1117/12.925373

24 September 2012 An experimental VLT cryo-cooler instrumentation vibration analysis

Gerd Jakob, Jean-Louis Lizon

Proceedings Volume 8446, Ground-based and Airborne Instrumentation for Astronomy IV; 844638 (2012) https://doi.org/10.1117/12.925373
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.925373

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