Abstract
The impact of different spallation models implemented in the particle transport code PHITS on the shielding design of Transmutation Experimental Facility is investigated. For 400-MeV proton incident on a lead-bismuth eutectic target, an effective dose rate at the end of a thick radiation shield (3-m-thick iron and 3-m-thick concrete) calculated by the Liege intranuclear cascade (INC) model version 4.6 (INCL4.6) coupled with the GEMcode (INCL4.6/GEM) yields about twice as high as the Bertini INC model (Bertini/GEM). A comparison with experimental data for 500-MeV proton incident on a thick lead target suggest that the prediction accuracy of INCL4.6/GEM would be better than that of Bertini/GEM. In contrast, it is found that the dose rates in beam ducts in front of targets calculated by the INCL4.6/GEMare lower than those by the Bertini/GEM. Since both models underestimate the experimental results for neutron-production doubledifferential cross sections at 180◦ for 140-MeV proton incident on carbon, iron, and gold targets, it is concluded that it is necessary to allow a margin for uncertainty caused by the spallation models, which is a factor of two, in estimating the dose rate induced by neutron streaming through a beam duct.
Highlights
To promote research, development, and demonstration of elemental technologies for acceleratordriven systems (ADS) [1,2,3,4,5], the Japan Atomic Energy Agency (JAEA) is planning to construct the Transmutation Experimental Facility (TEF) at J-PARC [6, 7]
Within the framework of the International Atomic Energy Agency (IAEA) benchmark program [11], a benchmark survey of spallation models demonstrated that the INCL model was the most accurate, further validation is still required to employ the INCL4.6 implemented in PHITS for specific applications such as ADS
This study investigates the impact of different spallation models, i.e., INCL4.6 and Bertini intranuclear cascade (INC), on the TEF shielding characteristics
Summary
Development, and demonstration of elemental technologies for acceleratordriven systems (ADS) [1,2,3,4,5], the Japan Atomic Energy Agency (JAEA) is planning to construct the Transmutation Experimental Facility (TEF) at J-PARC [6, 7]. TEF utilizes a 250-kW proton beam accelerated with a 400-MeV LINAC accelerator at J-PARC. The proton beam is injected to the LBE target, in which intense spallation neutrons are produced. Basic concept of the TEF shielding design is the same as existing spallation neutron source facilities such as JSNS [13] at J-PARC, namely, the LBE target is surrounded by iron blocks, and an ordinary concrete shield is arranged outside the iron shield. Air Concrete Iron SUS316 void Water-cooled shield A5083 LBE Iron(7.4) void Copper UC4 Lead x [cm]
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