8 July 2014 Tests and procedures for optimizing EMIR cooling system
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Abstract
EMIR is a wide-field camera and a multi-object, intermediate resolution near-infrared spectrograph for the GTC telescope. EMIR is a cryogenic instrument whose cooling system is based on four two-stage CCCs’ Leybold Coolpower 5/100 whose cooling capacity is 100W@80K, in the 1st stage, and 5W@20K, in the 2nd stage, operated directly by two compressors in dual mode (two cold heads for each compressor). During the verification phase some phenomena affecting the cooling system efficiency have been observed. In consequence, the possible influences of the temperature of the water in the cooling unit the compressor, the compressor input power and the quality of the insulating vacuum in the instrument have been studied. Contamination in the Closed Helium Cycle is another possible cause that has been evaluated. The methods used in the tests and the cleaning procedures are described. The results allow us to reach some conclusions regarding the use and maintenance of this type of cooling systems.
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Patricia Fernández Izquierdo, Patricia Fernández Izquierdo, Jean Louis Lizon, Jean Louis Lizon, Miguel Ángel Núñez Cagigal, Miguel Ángel Núñez Cagigal, Jesús Patrón Recio, Jesús Patrón Recio, Maria Barreto Cabrera, Maria Barreto Cabrera, Francisco Garzón López, Francisco Garzón López, } "Tests and procedures for optimizing EMIR cooling system", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91474H (8 July 2014); doi: 10.1117/12.2055811; https://doi.org/10.1117/12.2055811
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