Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultracold Neutron Storage Simulation Using the Kassiopeia Software
  Package   The Kassiopeia software package was originally developed to simulate
electromagnetic fields and charged particle trajectories for neutrino mass
measurement experiments. Recent additions to Kassiopeia also allow it to
simulate neutral particle trajectories in magnetic fields based on their
magnetic moments. Two different methods were implemented: an exact method that
can work for arbitrary fields and an adiabatic method that is limited to
slowly-varying fields but is much faster for large precession frequencies.
Additional interactions to simulate reflection of ultracold neutrons from
material walls and to allow spin-flip pulses were also added. These tools were
used to simulate neutron precession in the Paul Scherrer Institute's neutron
electric dipole moment experiment and predict the values of the longitudinal
and transverse relaxation times as well as the trapping lifetime. All three
parameters are found to closely match the experimentally determined values when
simulated with both the exact and adiabatic methods, confirming that Kassiopeia
is able to accurately simulate neutral particles. This opens the door for
future uses of Kassiopeia to prototype the next generation of atomic traps and
ultracold neutron experiments.

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The categories of this paper are: alg-geom
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: nlin
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The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-th