Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The NuMI Neutrino Beam at Fermilab   The Neutrinos at the Main Injector (NuMI) facility at Fermilab is due to
begin operations in late 2004. NuMI will deliver an intense muon neutrino beam
of variable energy 2-20 GeV directed into the Earth at 58 mrad for short (~1
km) and long (~700-900 km) baseline experiments. Several aspects of the design
are reviewed, as are potential upgrade requirements to the facility in the
event a Proton Driver is built at Fermilab to enhance the neutrino flux.

11
The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
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The categories of this paper are: cond-mat
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-th
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg