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

TY - JOUR

T1 - Simulations of chopper jitter at the LET neutron spectrometer at the ISIS TS2

AU - Klenø, Kaspar Hewitt

AU - Lefmann, Kim

AU - Willendrup, Peter Kjær

AU - Christiansen, P.

AU - Bewley, R.

PY - 2014/4/9

Y1 - 2014/4/9

N2 - 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.

AB - 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.

U2 - 10.3233/jnr-140010

DO - 10.3233/jnr-140010

M3 - Journal article

SN - 1023-8166

VL - 17

SP - 77

EP - 85

JO - Journal of Neutron Research

JF - Journal of Neutron Research

IS - 2

ER -