Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fast automated scanning of OPERA emulsion films   The use of nuclear emulsions to record tracks of charged particles with an
accuracy of better than 1 micron is possible in large physics experiments
thanks to the recent improvements in the industrial production of emulsions and
to the development of fast automated microscopes.
  The European Scanning System (ESS) is a fast automatic system developed for
the mass scanning of the emulsions of the OPERA experiment, which requires
microscopes with scanning speeds of about 20 cm$^2$/h. Recent improvements in
the technique and measurements with ESS are reported.

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The categories of this paper are: cond-mat
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The categories of this paper are: econ
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The categories of this paper are: nucl-th
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The categories of this paper are: cs
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The categories of this paper are: mtrl-th
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The categories of this paper are: math
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: gr-qc