Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Traveling wave method for simulating geometric beam coupling impedance
  of a beamscreen with pumping holes   In particle accelerators, pumping holes in a vacuum chamber can be a source
of unwanted broadband coupling impedance, leading to beam instabilities.
Analytical methods have been previously developed to estimate the impedance of
holes in circular-like chambers e.g. the beamscreen of the Large Hadron
Collider (LHC). More sophisticated chamber designs like that of the High Energy
LHC (HE-LHC) and the Future Circular Collider (FCC-hh) call for a different way
to calculate the impedance. We propose using decomposition of the wakefield
into synchronous traveling waves and employing a numerical solver to find the
impedance of each wave. This method is compared to the direct time domain
wakefield calculation method and its greater sensitivity to small impedances is
shown.

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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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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: atom-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: alg-geom
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The categories of this paper are: hep-th
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The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-ex