报告摘要：
The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory was commissioned in April, 2006 and reached a nominal operating power of 1 MW in September, 2009. Even at ~2/3 of its designed capacity, SNS already becomes the brightest pulsed neutron source in the world, and a premier facility for material and life science research. To provide accurate target performance estimation and to meet future development needs, we developed an as-built model for the operating target system of the SNS. Following a brief introduction of SNS, the design of the SNS target system as exhibited in this as-built model is discussed. We further present a map of neutron economy for the SNS target system by investigating the neutron and proton flux distributions, the neutron balance, and the energy deposition. Based on the as-built model, the moderator performance at SNS was recalculated taking advantage of the improved physics in the Monte Carlo simulation code, MCNPX, and most recent scattering kernels. The neutron intensity spectra, pulse shapes and brightness profiles regarding the SNS moderator performance are discussed in this talk.
报告人简介：
MAJOR RESEARCH FIELDS
• Spallation neutronics analysis and code development, including spallation target system (target-moderator-reflector assembly) modeling, design and optimization, burn-up calculation and programming,radiation dosage analysis and shielding design.
• Spallation material science on Monte Carlo simulation and analysis of radiation damage to materials.
EDUCATION
• Tsinghua University, Beijing, China (1993 – 1999)
M.S., Nuclear Science and Technology
B.S., Engineering Physics
• North Carolina State University (NCSU), Raleigh, NC (1999 – 2003)
Ph.D., Nuclear Engineering
Master of Computer Science
POSITIONS
• 2008 – pres. Nuclear analyst
Oak Ridge National Laboratory, Oak Ridge, TN.
• 2005 – 2008 Post-doctoral Research Associate
Oak Ridge National Laboratory, Oak Ridge, TN.
• 2004 – 2005 Post-doctoral Research Associate, Department of Nuclear Engineering, North Carolina State University, Raleigh, NC.
• Summer, 2002 Visiting Scientist, Paul Scherrer Institute, Villigen, Switzerland. |
