Cryomechanism: a cryogenic rotating actuator

J.-C. Barriere; M. Berthé; M. Carty; B. Duboué; J. Fontignie; D. Leboeuf; J. Martignac; C. Cara; P. Charon; G. A. Durand; D. Bachet

doi:10.1117/12.2022997

27 September 2013 Cryomechanism: a cryogenic rotating actuator

J.-C. Barriere, M. Berthé, M. Carty, B. Duboué, J. Fontignie, D. Leboeuf, J. Martignac, C. Cara, P. Charon, G. A. Durand, D. Bachet

Author Affiliations +

Proceedings Volume 8863, Cryogenic Optical Systems and Instruments 2013; 886305 (2013) https://doi.org/10.1117/12.2022997
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

Fifteen years ago, CEA started the development of cryogenic rotating actuators for the astrophysical infrared camera (VISIR) that is set on the Very Large Telescope (VLT). At the time of the VISIR first light in 2004, 10 cryogenic rotating actuators, also known as “CryoMechanisms” (CM), were present in the instrument. Today VISIR is still operating and the CM that are actuated several times a day, have no reported failure up to now. In continuation of the VISIR project, CEA undertook space qualification tests with the aim of making the CM compatible with space missions. Relying on this background, a smaller model of the mechanism has been built and tested at cryogenic temperatures. Today, the cryomechanisms are selected for the ESA/EUCLID [1] space mission. The qualification program will run throughout 2014. This paper first describes the VISIR’s baseline specification, the CM design and its operation principle. Then, the upgrades for the space constrains are shown and the qualification plan with respect to vibrations, thermal cycling and life testing campaigns is given. Some results of the tests carried out on a qualification model are addressed. At end, the design improvements for the EUCLID project are presented and a summary of the CM capabilities is highlighted.

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J.-C. Barriere, M. Berthé, M. Carty, B. Duboué, J. Fontignie, D. Leboeuf, J. Martignac, C. Cara, P. Charon, G. A. Durand, and D. Bachet "Cryomechanism: a cryogenic rotating actuator", Proc. SPIE 8863, Cryogenic Optical Systems and Instruments 2013, 886305 (27 September 2013); https://doi.org/10.1117/12.2022997

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KEYWORDS

Curium

Cryogenics

Computer aided design

Actuators

Space operations

Mirrors

Large telescopes

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