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Non-static surfaces in MCNPX: The chopper extension

Conference ·
DOI:https://doi.org/10.3233/JNR-200148· OSTI ID:1779158
 [1];  [1];  [1]
  1. ORNL
+ Show Author Affiliations
Rotating objects, such as choppers, are common components of a neutron beamline, and the motion of these components is not described in the static geometry of an MCNPX model. The special case of non-static surfaces for rotation about a stationary point in space has been developed for MCNPX. In addition, velocity dependent kinematics due to the motion of the medium have been implemented. This implementation allows for the simulation of rotating objects at speeds comparable to the velocity of cold neutrons. Applications of the chopper extension will be discussed, including the direct simulation of a bandwidth chopper system, the thermalization of neutrons inside a spinning material, and the discussion of the implementation of a spinning single crystal.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
DOE Contract Number:
AC05-00OR22725
OSTI ID:
1779158
Country of Publication:
United States
Language:
English

References (3)

A Chopper Extension to model neutron transport with non-static surfaces and high-speed moving media in MCNPX 2.7
  • Grammer, Kyle B.; Gallmeier, Franz X.; Iverson, Erik B.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 932 https://doi.org/10.1016/j.nima.2019.04.052
journal July 2019
Moving crystal slow-neutron wavelength analyser journal February 1973
Implementation of Neutron Mirror Modeling Capability into MCNPX and Its Demonstration in First Applications journal December 2009

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