Herschel/Planck Environmental Tests in the CSL Facilities

Details Herschel/Planck Environmental Tests in the CSL Facilities Herschel/Planck Environmental Tests in the CSL Facilities

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.558..505t&link_type=abstract

Proceedings of the 5th International Symposium on Environmental Testing for Space Programmes Noordwijk, The Netherlands (ESA SP-

Computer Science

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The Herschel/Planck scientific mission is the fourth cornerstone project in the European Space Agency (ESA) science "Horizon 2000"plan. In the scope of this project, the Centre Spatial de Liege (CSL) has in charge to perform cryo-optical environmental tests on systems and subsystems of the two satellites. The tests will be conducted in four of the CSL facilities. Most of them have been especially upgraded in order to receive the mission systems and subsystems: Focal XXL, the cryovibrations chamber and Focal 5. In the frame of the Planck satellite, tests campaign will be accomplished on the Secondary and the Primary Reflectors of the Telescope, on the Telescope itself and on the overall Spacecraft. This last one consists in a high technical challenge as it is the only way to measure the end-to-end cooling chain of the instrument. Concerning the Herschel satellite, the Telescope will be tested in space conditions while scientific focal plane instruments will undergo cryogenic vibrations (PACS, HIFI, SPIRE) in a specific facility. In addition to the optical measurements specifications, each test requires cryogenic temperatures, lower than 20 [K]. Consequently, all the facilities are linked to a common cold helium circuitry. This allows performing some of the aboved-mentionned tests independently in several facilities, at the same time. From the facilities point of view, the relevant testing philosophies used to meet the specifications, the related problems and the CSL solutions are presented. Results of the first campaigns will also be presented.

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