Technical Paper
Planck Payload Thermal Design
2000-07-10
2000-01-2323
PLANCK is an ESA scientific mission dedicated to produce accurate map of the temperature fluctuations of the Cosmic Microwave Background, the fossil radiation carrying direct information from the early universe. The launch is foreseen in 2007 by an Ariane 5 rocket, together with the ESA cornerstone mission FIRST. The selected operational orbits for both satellites are Lissajous orbits around the second Lagrangian Libration point (L2) in the Earth - sun system. The PLANCK scientific payload is composed basically of the two scientific instruments HFI (High Frequency Instrument) and LFI (Low Frequency Instrument) which detectors are located at the focal plane of a 1.5 m Gregorian telescope. The LFI detectors are based on HEMT amplifier technology and need to be cooled down to 20 K. The detectors for the HFI are bolometers operating at 0.1 K.
