The Herschel ESA spacecraft was launched at low temperature to reduce cooling fluid consumption in orbit. Therefore, focal instruments had to be vibrated at low temperature similar to the temperature encountered during the launch phase.
A temperature of 20 K on the specimen had to be achieved before starting the test.
The facility is made of a vacuum vessel with a flat bottom part attached firmly to the ground of the clean room.
The vessel itself surrounds the vibration table of the shaker.
Six feet go through the bottom plate of the vessel and the tightness is done by bellows that connect the moving part that is the vibration interface to the static part which is the vessel. These bellows allow the relative movement of those parts.
Inside the vessel, around the vibration interface welded box, is installed a thermal tent whose aim is to obtain the given temperature on the specimen. It is made of a double wall shrouds fed with Liquid Nitrogen and Helium.
The whole equipment is designed to be compatible for both the transversal vibration tests and the vertical test.
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