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  News 
news News from the Cryogenic Qualification Model (CQM) tests in Liège
The Cryogenic Qualification Model (CQM) of the Planck satellite is beeing tested at the CSL (Centre Spatial de Liège). On Monday 26 September, HFI goes down to 100/101 mK on the cold end of the dilution cooler, in the CQM S/C configuration, at CSL plants, in Focal 5 vacuum chamber. The bolometer plate reaches 107 mK. It was achieved during a second cool down, after 3 weeks of investigations or/and instrument test phases involving only the 4K and 1.6K stages.
ESA-Belgium
     
Instrument

The High Frequency Instrument (HFI) onboard the Planck satellite use bolometric detectors cooled to 100mK to detect sub-millimeter and millimeter radiation. A Simplified functional block-diagram of HFI, from the radiation coming from the observed source to the data flow, is shown on the following figure:

HFI block-diagram (JPEG)

The different sub-systems of HFI are described in this section. I hope you will find all answers to the questions you have on the HFI hardware. If it is not the case or if you have any comment, please do not hesitate to contact me (Michel Piat).

   
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