Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: HARPO - A Gaseous TPC for High Angular Resolution Gamma-Ray Astronomy
  and Polarimetry from the MeV to the TeV   We propose a "thin" detector as a high-angular-precision telescope and
polarimeter for cosmic gamma-rays above the pair-creation threshold. We have
built a demonstrator based on a gaseous TPC. We are presently characterizing
the detector with charged cosmic rays in the laboratory. Here we present some
of its properties.

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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
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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: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom
1
The categories of this paper are: cs