Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: SuperKEKB Collider   SuperKEKB, a 7 GeV electron - 4 GeV positron double-ring collider, is
constructed by upgrading KEKB in order to seek new physics beyond the Standard
Model. The design luminosity of SuperKEKB is 8 x 10^35 /cm^2 /s - 40 times
higher than that achieved by KEKB. The greater part of the gain comes from
significantly decreasing the beam sizes at the interaction point based on the
nanobeam collision scheme; the design beam currents in both rings are double
those achieved in KEKB. Large-scale construction to upgrade both the collider
rings and the injector was conducted, and beam commissioning without the Belle
II detector and final-focus magnets was successfully carried out from February
to June in 2016. Subsequently, renovation of the interaction region, including
the installation of the final-focus magnets and Belle II, and construction in
the final stage of a new positron damping ring were conducted. Having completed
the interaction region, beam collision tuning is scheduled from March till July
in 2018. This paper reviews the design, construction, and beam commissioning of
SuperKEKB.

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The categories of this paper are: chem-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: atom-ph
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The categories of this paper are: q-alg
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The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: comp-gas
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: astro-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: quant-ph