Lawrence, CharlesCharlesLawrenceTauber, JanJanTauberPuget, Jean-LoupJean-LoupPugetPiacentini, FrancescoFrancescoPiacentiniMORGANTE, GIANLUCAGIANLUCAMORGANTEPearson, DavidDavidPearsonFourmond, Jean-JacquesJean-JacquesFourmondLeroy, C.C.LeroyPiat, MichelleMichellePiatHolmes, WarrenWarrenHolmesTERENZI, LUCALUCATERENZITaylor, D.D.Taylor2023-02-152023-02-152009http://hdl.handle.net/20.500.12386/33477The Planck cryo-system comprises the following main elements: - The warm radiator of the Payload Module, maintained in the 260-280 K range - The radiating surfaces on the Payload Module (PPLM), which passively cool the payload below ~50 K on the 3rd V-groove, and ~40 K on the reflectors - The 20 K Sorption Cooler, which is pre-cooled by the passive radiators to 60 K and cools the LFI focal plane and the HFI interface to ~18 K - The 4 K cooler, which is pre-cooled by the passive radiators and the 20 K cooler and cools the outer parts of the HFI-FPU and the LFI reference loads to ~4 K - the 0.1 K dilution cooler, which is pre-cooled by the passive radiators, the 20 K cooler, and the 4 K cooler, and cools the inner HFI-FPU box to ~1.6K and the HFI detector plane to ~0.1 K. These elements have been developed by JPL and Industry within the two instruments consortia and under the overall management of the Herschel-Planck Project Team. The Sorption Cooler is common to both instruments but managed by the LFI Project Manager. The two other coolers were developed by the HFI team. The main objective of this document is to define the optimum operation of this complex cryo system during: - cool-down of the system after launch, and in the early stage of the mission; - tuning of the system; - routine operations; - special operations such as the switchover between the two Sorption Coolers, and their regeneration; - anomalies and contingencies. The document also contains information about the expected lifetime of the elements.ELETTRONICOenResearch reportFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_17 Instrumentation – telescopes, detectors and techniques