title: Validation of source biasing method for its use in CSNS beamline shielding calculation.
abstract: The Chinese spallation neutron source (CSNS) is a high-performance pulsed neutron source, having 20 neutron beamlines for neutron scattering instruments. The shielding design of these beamlines is usually needed for Monte Carlo (MC) calculation, and the use of variance reduction methods is critical to carrying out an efficient, reliable MC shielding calculation. This paper discusses the source biasing method based on actual source term and geometry model of a CSNS neutron beamline. Dose distribution throughout the geometry model was calculated with the FLUKA MC code. Full analogue calculation and biased calculation were compared, and it was validated that the source biasing method can effectively promote the calculation efficiency.
authors.affiliation: Department of Physics, Nankai University, Tianjin 300071, China Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Tai-ran
authors.initials: TR
authors.lastname: Liang
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China The School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Shen
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Tian-jiao
authors.initials: TJ
authors.lastname: Liang
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China wenyin@aphy.iphy.ac.cn.
authors.forename: Wen
authors.initials: W
authors.lastname: Yin
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Quan-zhi
authors.initials: QZ
authors.lastname: Yu
authors.affiliation: Department of Physics, Nankai University, Tianjin 300071, China.
authors.forename: Chun-xu
authors.initials: CX
authors.lastname: Yu
mesh_terms: D002681:China; D003198:Computer Simulation; D006801:Humans; D008962:Models, Theoretical; D009502:Neutrons; D010315:Particle Accelerators / Q000295:instrumentation*; D011829:Radiation Dosage; D011832:Radiation Injuries / Q000517:prevention & control*; D011835:Radiation Protection / Q000295:instrumentation* / Q000379:methods*; D011874:Radiometry