TY - GEN
T1 - A suite of SNS neutron instrument models
AU - Hamilton, A. C.
AU - Gallmeier, F. X.
PY - 2011
Y1 - 2011
N2 - MCSTAS models of the Spallation Neutron Source (SNS) neutron scattering instruments are being developed in a unified approach. Models aid performance assessment of the instruments, diagnosis of the component setup, and provide a tool for experiment planning and evaluation for the user community. The MCSTAS code has become a standard tool for neutron optics simulations in the neutron scattering community. Neutrons are tracked through the instrument model starting from moderator emission profiles through beam shaping components to the scattering at the sample and neutron detection. Models for the POWGEN, TOPAZ, VULCAN, and NOMAD instruments were completed utilizing as-built information as much as possible. Simulation results with the models are validated with measured data. While measurements and simulations of the neutron spectra incident to the sample location can agree within 10%, as for VULCAN, discrepancies have been identified for POWGEN and TOPAZ that indicate misalignment of components as neutron guide segments. Ideally, these misalignments are traced down and corrected as found.
AB - MCSTAS models of the Spallation Neutron Source (SNS) neutron scattering instruments are being developed in a unified approach. Models aid performance assessment of the instruments, diagnosis of the component setup, and provide a tool for experiment planning and evaluation for the user community. The MCSTAS code has become a standard tool for neutron optics simulations in the neutron scattering community. Neutrons are tracked through the instrument model starting from moderator emission profiles through beam shaping components to the scattering at the sample and neutron detection. Models for the POWGEN, TOPAZ, VULCAN, and NOMAD instruments were completed utilizing as-built information as much as possible. Simulation results with the models are validated with measured data. While measurements and simulations of the neutron spectra incident to the sample location can agree within 10%, as for VULCAN, discrepancies have been identified for POWGEN and TOPAZ that indicate misalignment of components as neutron guide segments. Ideally, these misalignments are traced down and corrected as found.
UR - http://www.scopus.com/inward/record.url?scp=84878231419&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84878231419
SN - 9781622767915
T3 - 10th International Topical Meeting on Nuclear Applications of Accelerators 2011, AccApp 2011
SP - 223
EP - 227
BT - 10th International Topical Meeting on Nuclear Applications of Accelerators 2011, AccApp 2011
T2 - 10th International Topical Meeting on Nuclear Applications of Accelerators 2011, AccApp 2011
Y2 - 3 April 2011 through 7 April 2011
ER -