Planck-LFI: Design and Performance of the 4 Kelvin Reference Load Unit

Details Planck-LFI: Design and Performance of the 4 Kelvin Reference Load Unit Planck-LFI: Design and Performance of the 4 Kelvin Reference Load Unit

2010-01-26

arxiv.org/abs/1001.4778v1

2009 JINST 4 T12006

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

This is an author-created, un-copyedited version of an article accepted for publication in JINST. IOP Publishing Ltd is not re

Scientific paper

10.1088/1748-0221/4/12/T12006

The LFI radiometers use a pseudo-correlation design where the signal from the sky is continuously compared with a stable reference signal, provided by a cryogenic reference load system. The reference unit is composed by small pyramidal horns, one for each radiometer, 22 in total, facing small absorbing targets, made of a commercial resin ECCOSORB CR (TM), cooled to approximately 4.5 K. Horns and targets are separated by a small gap to allow thermal decoupling. Target and horn design is optimized for each of the LFI bands, centered at 70, 44 and 30 GHz. Pyramidal horns are either machined inside the radiometer 20K module or connected via external electro-formed bended waveguides. The requirement of high stability of the reference signal imposed a careful design for the radiometric and thermal properties of the loads. Materials used for the manufacturing have been characterized for thermal, RF and mechanical properties. We describe in this paper the design and the performance of the reference system.

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