Animation of the Herschel spacecraft build-up, showing the different components from the inside out. Starting with the optical bench and the focal plane units (FPUs) of the three instruments (HIFI, PACS and SPIRE), located in the top of the cryostat vacuum vessel.
Helium gas boils of from the superfluid helium II in the helium II tank and flows into pipes around the FPUs to cool them down to between
The external shield of the cryostat vacuum vessel, not being cooled down, stays at ambient
- September 19, 2007
- ESA/AOES Medialab