Investigation of propagation algorithms for ray-tracing simulation of polarized neutrons

Erik Bergbäck Knudsen, A. Tranum-Rømer, Peter Kjær Willendrup, P. Christiansen, Kim Lefmann

Research output: Contribution to journalJournal articleResearchpeer-review


Ray-tracing of polarized neutrons faces a challenge when the neutron propagates through an inhomogeneous magnetic field. This affects simulations of novel instruments using encoding of energy or angle into the neutron spin. We here present a new implementation of propagation of polarized neutrons within the McStas simulation package and show that it outperforms the de-facto standard method implemented in the NISP package by Seeger and Daemen. We include simulation of a simplified model of a spin-echo instrument, including a simple virtual experiment.
Original languageEnglish
JournalJournal of Neutron Research
Issue number1
Pages (from-to)27-34
Publication statusPublished - 2014


  • Ray-tracing
  • Neutron spin-echo
  • Larmor precession
  • McStas
  • Algorithms


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