Editing BOOMERanG experiment (section)

==Instrumentation==
The experiment uses [[bolometer]]s<ref name="Crill">{{cite journal|title=BOOMERANG: A Balloon-borne Millimeter Wave Telescope and Total Power Receiver for Mapping Anisotropy in the Cosmic Microwave Background|journal=[[Astrophysical Journal Supplement Series]]|volume=148|pages=527–541|doi=10.1086/376894|arxiv=astro-ph/0206254|last1=Crill|first1=B. P.|display-authors=etal|date=October 2003|issue=2|bibcode=2003ApJS..148..527C|s2cid=545283}}</ref> for  radiation detection. These bolometers are kept at a temperature of 0.27 [[kelvin]]. At this temperature the material has a very low heat capacity according to the [[Debye model|Debye law]], thus incoming microwave light will cause a large temperature change, proportional to the intensity of the incoming waves, which is measured with sensitive thermometers.

An off-axis 1.3-meter primary mirror<ref name="Crill"/> focuses the microwaves onto the focal plane, which consist of 16 horns. These horns, operating at 145&nbsp;GHz, 245&nbsp;GHz and 345&nbsp;GHz, are arranged into 8 pixels. Only a tiny fraction of the sky can be seen concurrently, so the telescope must rotate to scan the whole field of view.