Cryostat Cover Mechanism for the HERSCHEL satellite: design and qualification test results

Physics

Scientific paper

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Deployment And Hold-Down Mechanisms

Scientific paper

The Cryostat Cover Mechanism closes the Cryostat Vacuum Vessel on ground and is preventing air-leakage from outside and keeping high-vacuum inside the Cryostat of the European infrared space telescope HERSCHEL. The cover and its mechanisms are single point failure critical items for the entire mission and are designed for cryogenic operation. Austrian Aerospace was contracted by EADS ASTRIUM and prime contractor ALCATEL to develop the Cryostat Cover Mechanism, which consists of the cover itself which features an active cooling loop, a deployment mechanism and a non-explosive hold-down- and release mechanism. The main challenges are clearly the actuation temperature at 70K, the required tightness on ground, and the high reliability of this device. The QM has been successfully delivered in January 2005, the FM will be finally delivered by end of 2005. The scope of this presentation is to present briefly the design of the Cryocover, and to highlight the qualification test results.

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