Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: HARPO: beam characterization of a TPC for gamma-ray polarimetry and high
  angular-resolution astronomy in the MeV-GeV range   A time projection chamber (TPC) can be used to measure the polarization of
gamma rays with excellent angular precision and sensitivity in the MeV-GeV
energy range through the conversion of photons to e+e- pairs. The Hermetic
ARgon POlarimeter (HARPO) prototype was built to demonstrate this concept. It
was recently tested in the polarized photon beam at the NewSUBARU facility in
Japan. We present this data-taking run, which demonstrated the excellent
performance of the HARPO TPC.

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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
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The categories of this paper are: econ
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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The categories of this paper are: stat
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The categories of this paper are: ao-sci
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The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas