Planck early results
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Table 2

Main operational and interface parameters of the active cooling chain.

Interface Sorption cooler-4He-JT cooler (4 K gas pre-cooling temperature) 17.2 K
Interface 4He-JT cooler-dilution cooler (dilution gas pre-cooling temperature) 4.37 K
Interface 1.4 K cooler-dilution gas precooling 1.34 K
Temperature of dilution plate (after regulation) 100.4 mK
Temperature of bolometer plate (after regulation) 103 mK
Temperature of 1.4 K plate (after regulation) 1.395 K
Temperature of 4 K plate (after regulation) 4.80 K
Dilution plate PID power 24.3–30.7 nW
Bolometer plate PID power 5.1–7.4 nW
1.4 K PID power 270 μW
4 K PID power 1.7 mW
4He-JT cooler stroke amplitude 3450 μm
Dilution cooler 4He flow rate 16.19–16.65 μmole/s
Dilution cooler 3He flow rate 5.92–6.00 μmole/s
Present survey life time (started 6 August 2009) 29.4 months

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