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Proceedings Paper

Tests and procedures for optimizing EMIR cooling system
Author(s): Patricia Fernández Izquierdo; Jean Louis Lizon; Miguel Ángel Núñez Cagigal; Jesús Patrón Recio; Maria Barreto Cabrera; Francisco Garzón López
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Paper 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.

Paper Details

Date Published: 8 July 2014
PDF: 14 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91474H (8 July 2014); doi: 10.1117/12.2055811
Show Author Affiliations
Patricia Fernández Izquierdo, Instituto de Astrofísica de Canarias (Spain)
Jean Louis Lizon, European Southern Observatory (Germany)
Miguel Ángel Núñez Cagigal, Instituto de Astrofísica de Canarias (Spain)
Jesús Patrón Recio, Instituto de Astrofísica de Canarias (Spain)
Maria Barreto Cabrera, Instituto de Astrofísica de Canarias (Spain)
Francisco Garzón López, Instituto de Astrofísica de Canarias (Spain)


Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)

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