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Title: PENTRAN Modeling for Design and Optimization of the Spherical-Shell Transmission Experiments

Abstract

The development of PENTRAN models and new methodologies for accurate and efficient simulations for the design and analysis of time-of-flight (TOF) experiments is discussed. The experimental setup measures the transmission of accelerator-generated neutrons (E > 1 MeV) through spherical iron shells using the TOF spectroscopy. The TOF facility includes a collimator, a thick wall with a hole, a TOF tunnel, and a detector placed {approx}620 cm from the neutron source. The goal of the experiment is to correlate the measured spectrum to different types of interactions, such as the total nonelastic-scattering cross section and its various components. The development of several 3-D PENTRAN models and the effectiveness of new quadrature sets are discussed. Initial calculations by means of the developed 3-D discrete ordinates model of the TOF experimental setup using the PENTRAN code with the S{sub 20} level-symmetric quadrature resulted in inaccurate solutions due to ray effects. To overcome this difficulty, new quadrature sets with local refinement capability were used. These new quadrature sets allowed more accurate, yet efficient, calculations. This study indicated that for the TOF model the P{sub n}-T{sub n} (Chebyshev) set with ordinate-splitting yields accurate results in a relatively short time.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
The Pennsylvania State University, University Park, Pennsylvania (US); National Institute of Standards and Technology, Gaithersburg, Maryland (US); Ohio University, Athens, Ohio (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
786232
Report Number(s):
ISSN 0003-018X; CODEN TANSAO
ISSN 0003-018X; CODEN TANSAO; TRN: US0108849
Resource Type:
Conference
Resource Relation:
Conference: 2001 Annual Meeting, Milwaukee, WI (US), 06/17/2001--06/21/2001; Other Information: Transactions of the American Nuclear Society, volume 84; PBD: 17 Jun 2001
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; P CODES; TIME-OF-FLIGHT SPECTROMETERS; NEUTRON TRANSPORT; DISCRETE ORDINATE METHOD; IRON; NEUTRON SOURCES; QUADRATURES; THREE-DIMENSIONAL CALCULATIONS; REACTOR VESSELS; FAST NEUTRONS; TRANSMISSION; SHELLS; NEUTRON TRANSPORT THEORY; MEV RANGE 01-10; SPHERES; COMPUTERIZED SIMULATION; DISCRETE ORDINATES METHOD

Citation Formats

Kucukboyaci, Vefa, Haghighat, Alireza, Adams, James M, Carlson, Allan D, Grimes, Steven M, and Massey, Thomas N. PENTRAN Modeling for Design and Optimization of the Spherical-Shell Transmission Experiments. United States: N. p., 2001. Web.
Kucukboyaci, Vefa, Haghighat, Alireza, Adams, James M, Carlson, Allan D, Grimes, Steven M, & Massey, Thomas N. PENTRAN Modeling for Design and Optimization of the Spherical-Shell Transmission Experiments. United States.
Kucukboyaci, Vefa, Haghighat, Alireza, Adams, James M, Carlson, Allan D, Grimes, Steven M, and Massey, Thomas N. 2001. "PENTRAN Modeling for Design and Optimization of the Spherical-Shell Transmission Experiments". United States.
@article{osti_786232,
title = {PENTRAN Modeling for Design and Optimization of the Spherical-Shell Transmission Experiments},
author = {Kucukboyaci, Vefa and Haghighat, Alireza and Adams, James M and Carlson, Allan D and Grimes, Steven M and Massey, Thomas N},
abstractNote = {The development of PENTRAN models and new methodologies for accurate and efficient simulations for the design and analysis of time-of-flight (TOF) experiments is discussed. The experimental setup measures the transmission of accelerator-generated neutrons (E > 1 MeV) through spherical iron shells using the TOF spectroscopy. The TOF facility includes a collimator, a thick wall with a hole, a TOF tunnel, and a detector placed {approx}620 cm from the neutron source. The goal of the experiment is to correlate the measured spectrum to different types of interactions, such as the total nonelastic-scattering cross section and its various components. The development of several 3-D PENTRAN models and the effectiveness of new quadrature sets are discussed. Initial calculations by means of the developed 3-D discrete ordinates model of the TOF experimental setup using the PENTRAN code with the S{sub 20} level-symmetric quadrature resulted in inaccurate solutions due to ray effects. To overcome this difficulty, new quadrature sets with local refinement capability were used. These new quadrature sets allowed more accurate, yet efficient, calculations. This study indicated that for the TOF model the P{sub n}-T{sub n} (Chebyshev) set with ordinate-splitting yields accurate results in a relatively short time.},
doi = {},
url = {https://www.osti.gov/biblio/786232}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jun 17 00:00:00 EDT 2001},
month = {Sun Jun 17 00:00:00 EDT 2001}
}

Conference:
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