Planck cryochain operations
Date Issued
2009
Author(s)
Lawrence, Charles
•
Tauber, Jan
•
Puget, Jean-Loup
•
Piacentini, Francesco
•
•
Pearson, David
•
Fourmond, Jean-Jacques
•
Leroy, C.
•
Piat, Michelle
•
Holmes, Warren
•
•
Taylor, D.
Abstract
The 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.
Volume
Planck/PSO/2007-017
Rights
open.access
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Planck PSO-2007-017 Cryo-chain Operations V3.0.pdf
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