Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Archeops: A balloon experiment to measure CMB anisotropies with a broad
  range of angular sizes   The Cosmic Microwave Background Radiation is the oldest photon radiation that
can be observed, having been emitted when the Universe was about 300,000 year
old. It is a blackbody at 2.73 K, and is almost perfectly isotropic, the
anisotropies being about one part to 100,000. However, these anisotropies,
detected by the COBE satellite in 1992, constrain the cosmological parameters
such as the curvature of the Universe.
  Archeops is a balloon-borne experiment designed to map these anisotropies.
The instrument is composed of a 1.5 m telescope and bolometers cooled at 85 mK
to detect radiation between 150 and 550 GHz. To lower atmosphere parasitic
signal, the instrument is lifted at 32 km altitude with a stratospheric balloon
during the arctic night. This instrument is also a preparation for the Planck
satellite mission, as its design is similar.
  We discuss here the results of the first scientific flight from Esrange (near
Kiruna, Sweden) to Russia on January 29th 2001, which led to a 22 %
(sub)millimetre sky coverage unprecedented at this resolution.

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The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: stat