Beamline Performance Simulations for the Fundamental Neutron Physics Beamline at the Spallation Neutron Source.
Monte Carlo simulations are being performed to design and characterize the neutron optics components for the two fundamental neutron physics beamlines at the Spallation Neutron Source. Optimization of the cold beamline includes characterization of the guides and benders, the neutron transmission through the 0.89 nm monochromator, and the expected performance of the four time-of-flight choppers. The locations and opening angles of the choppers have been studied using a simple spreadsheet-based analysis that was developed for other SNS chopper instruments. The spreadsheet parameters are then optimized using Monte Carlo techniques to obtain the results presented in this paper. Optimization of the 0.89 nm beamline includes characterizing the double crystal monochromator and the downstream guides. The simulations continue to be refined as components are ordered and their exact size and performance specifications are determined.
North Carolina State University, Raleigh, NC.
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Huffman
Oak Ridge National Laboratory, Oak Ridge, TN.
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Greene
Oak Ridge National Laboratory, Oak Ridge, TN.
R R
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Allen
Oak Ridge National Laboratory, Oak Ridge, TN.
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Cianciolo
Oak Ridge National Laboratory, Oak Ridge, TN.
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Huerto
Oak Ridge National Laboratory, Oak Ridge, TN.
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Koehler
The University of Tennessee, Knoxville, TN.
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Desai
The University of Tennessee, Knoxville, TN.
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Mahurin
The University of Tennessee, Knoxville, TN.
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A
Yue
North Carolina State University, Raleigh, NC.
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Palmquist
Indiana University, Bloomington, IN.
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Snow
McStas; neutron optics; neutron sources