Simulations of chopper jitter at the LET neutron spectrometer at the ISIS TS2

Kaspar Hewitt Klenø, Kim Lefmann, Peter Kjær Willendrup, P. Christiansen, R. Bewley

Research output: Contribution to journalJournal articleResearchpeer-review


The effect of uncertainty in chopper phasing (jitter) has been investigated for the high-resolution time-of-flight spectrometer LET at the ISIS second target station. The investigation is carried out using virtual experiments, with the neutron simulation package McStas, where the chopper jitter is found to cause a Lorentzian tail in the resolution function. We find that jitter even up to the unrealistically high value of 2 μs can be tolerated without any noticeable degradation of resolution or incident intensity. The results are supported by simple analytical estimates and are believed to be general for chopper spectrometers.
Original languageEnglish
JournalJournal of Neutron Research
Issue number2
Pages (from-to)77-85
Number of pages9
Publication statusPublished - 2014


  • SIMULATION methods & models
  • chopper jitter
  • disk chopper
  • ISIS
  • McStas
  • Neutron instrumentation
  • neutron spectrometer

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