PENTrack—a simulation tool for ultracold neutrons, protons, and electrons in complex electromagnetic fields and geometries

W. Schreyer, T. Kikawa, M. J. Losekamm, S. Paul, R. Picker

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Modern precision experiments trapping low-energy particles require detailed simulations of particle trajectories and spin precession to determine systematic measurement limitations and apparatus deficiencies. We developed PENTrack, a tool that allows to simulate trajectories of ultracold neutrons and their decay products—protons and electrons—and the precession of their spins in complex geometries and electromagnetic fields. The interaction of ultracold neutrons with matter is implemented with the Fermi-potential formalism and diffuse scattering using Lambert and microroughness models. The results of several benchmark simulations agree with STARucn v1.2, uncovered several flaws in Geant4 v10.2.2, and agree with experimental data. Experiment geometry and electromagnetic fields can be imported from commercial computer-aided-design and finite-element software. All simulation parameters are defined in simple text files allowing quick changes. The simulation code is written in C++ and is freely available at github.com/wschreyer/PENTrack.git.

Original languageEnglish
Pages (from-to)123-129
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume858
DOIs
StatePublished - 21 Jun 2017
Externally publishedYes

Keywords

  • Charged-particle tracking
  • Monte Carlo simulation
  • Neutron electric dipole moment
  • Neutron lifetime
  • Spin tracking
  • Ultracold neutrons

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