Numerical simulation of BL06 neutron beamline for 'VIN ROSE' at J-PARC/MLF

A new beam line for neutron resonance spin echo spectrometers is under construction at BL06 in the Materials and Life Science Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC). To design the radiation shielding in the setup for commissioning experiments we have performed the neutron beam transport calculation and dose evaluation via Monte Carlo method in the three-dimensional geometry. The radiation dose rates were kept below about 6 μSv/h outside of the thickness of 30 cm concrete shield surrounding the experimental area. We propose the conceptual design of radiation shielding of the beam line and simulation result playing an important role in determining engineering design and starting the construction. (author)