The Low Frequency Instrument (LFI) on-board the Planck satellite, is composed by an array of 54 receivers. They follow a pseudo-correlation scheme, continuously observing the sky and a stable reference load, at a temperature T～4K. The so-called 4K Reference Load is made of 54 small absorbing targets, mechanically and thermally connected to the High Frequency Instrument (HFI) cryostat. The 4K Reference Load requirements pose severe limits to its mass, dimensions, power dissipation and performance.
展开▼
