English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The LFI radiometers use a pseudo-correlation design where the signal from thesky is continuously compared with a stable reference signal, provided by acryogenic reference load system. The reference unit is composed by smallpyramidal horns, one for each radiometer, 22 in total, facing small absorbingtargets, made of a commercial resin ECCOSORB CR (TM), cooled to approximately4.5 K. Horns and targets are separated by a small gap to allow thermaldecoupling. 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 theradiometer 20K module or connected via external electro-formed bendedwaveguides. The requirement of high stability of the reference signal imposed acareful design for the radiometric and thermal properties of the loads.Materials used for the manufacturing have been characterized for thermal, RFand mechanical properties. We describe in this paper the design and theperformance of the reference system.

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