Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Longitudinal Single Bunch Instability Study on BEPCII   In order to study the single bunch longitudinal instability in BEPCII,
experiments on the positron ring (BPR) for the bunch lengthening phenomenon
were made. By analyzing the experimental data based on Gao's theory, the
longitudinal loss factor for the bunch are obtained. Also, the total wake
potential and the beam current threshold are estimated.

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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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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: alg-geom
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The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph