24 September 2012 The high altitude qualification tests of the cryogenic and vacuum system for ALMA
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The Cryogenic System of ALMA is one of the core sub systems of the Front End low noise receiver and the failsafe operation is mandatory to ensure the successful astronomical observations. ESO has done a comprehensive test campaign on the ALMA operational site Chajnantor1 at an altitude of 5000m, to qualify this system for the harsh operational conditions. In this contribution we will present an overview of those Qualification tests which have been carried out on ALMA`s 4K Cryogenic and Vacuum System components and the additional required measures to operate the system under the special environmental conditions, respectively the operational constrains. That will include the findings concerning the optimization of the remote diagnostic and the definition of additional monitor and control parameters. The resulting solutions have considerable influence on the maintenance processes, the operational staff requirements and the reduction of the operational costs in particularly with regards to the large system number of 66 antennas.
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Armin Silber, Armin Silber, } "The high altitude qualification tests of the cryogenic and vacuum system for ALMA", Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 84523D (24 September 2012); doi: 10.1117/12.925194; https://doi.org/10.1117/12.925194


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