Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Useful formulas for non-magnetized electron cooling   Recent success of Low Energy RHIC Electron Cooler (LEReC) opened a road for
development of high energy electron coolers based on non-magnetized electron
bunches accelerated by RF cavities. Electrons in such coolers can have velocity
distribution with various unequal horizontal, vertical and longitudinal
velocity spreads. In this paper we revisit a formula of friction force in
non-magnetized cooling and derive a number of useful expressions for different
limiting cases.

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The categories of this paper are: cond-mat
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
0
The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: supr-con
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: cs
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an