HFI operations

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All satellite operations including the HFI(Planck) High Frequency Instrument instrument ones are under ESAEuropean Space Agency MOC[ESA's] Mission Operation Center [Darmstadt, Germany] responsibilty for obvious safety reasons. The HFI(Planck) High Frequency Instrument instrument operations are nevertheless delegated to the HFI(Planck) High Frequency Instrument Instrument Operations Team (IOTInstrument Operation Team) built from the HFI(Planck) High Frequency Instrument consortium and under the HFI(Planck) High Frequency Instrument Principal Investigator responsibility. Instrument management, operations and parameter monitoring are thus prepared and controlled by the IOTInstrument Operation Team and serviced by MOC[ESA's] Mission Operation Center [Darmstadt, Germany] either in near real time during the DTCPDaily Tele-Communication Period or uploaded in the satellite mission timeline for defered execution. The HFI(Planck) High Frequency Instrument instrument health and science data quality has been monitored daily by the IOTInstrument Operation Team from launch till the end of the HFI(Planck) High Frequency Instrument extension mission phase. Apart from ground based tests, different operations phases did occur:

  • 14/05/2009-18/05/2009 Launch Early Operational Phase
  • 18/05/2009-09/07/2009 Commissioning Phase. The operations during this phase were under ESAEuropean Space Agency's Planck Project responsibilty. The main HFI(Planck) High Frequency Instrument activities have been functional tests of the instrument and its cooldown till 100 mK. Given the performance, the helium flow has been set to the minimal one giving an End Of Life estimation second half of January 2012.
  • 10/07/2009-12/08/2009 Calibration and Performance Verification Phase. The operations during this phase were under ESAEuropean Space Agency's Planck Science Office responsibilty. The main HFI(Planck) High Frequency Instrument operations have been performance tests and activities to mesure the effects of several systematics. The only instrument failure happened the 6th of August were the electronic part of the 4K cooler has been switched off probably due to a major cosmic particle. It has to be noted that no tuning of the HFI(Planck) High Frequency Instrument parameters have been executed in flight till the end of the full HFI(Planck) High Frequency Instrument mission, excepted in December 2009 for an adjustment of the on-board numerical compression parameters.
  • 12/08/2009-28/11/2010 HFI(Planck) High Frequency Instrument Nominal mission
  • 28/11/2010-13/01/2012 HFI(Planck) High Frequency Instrument Extended mission
  • 13/01/2012-(to be continued) LFI(Planck) Low Frequency Instrument "only" extension phase

The detailled operation timeline for HFI(Planck) High Frequency Instrument is given in this annex.