Monte-Carlo calculations of the activation of the accelerator target holder and shadow cone during the calibration of the ITER diagnostic devices with monoenergetic neutrons |
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| Institution: | 1. Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China;2. Advanced Energy Research Center, Shenzhen University, Shenzhen 518060, China;3. Institute of Energy, Hefei Comprehensive National Science Center, Anhui 230000, China;4. University of Science and Technology of China, Hefei 230026, China;5. Shanghai Nuclear Engineering Research and Design Institute Co., Ltd, Shanghai 200233, China;1. Department of Radiation Physics and Technology, Southern Tohoku Proton Therapy Center, Fukushima, Japan;2. Department of Radiological Sciences, School of Health Sciences, Fukushima Medical University, Fukushima, Japan;3. Department of Radiation Oncology, Southern Tohoku Proton Therapy Center, Fukushima, Japan |
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| Abstract: | The ITER International Fusion Energy Organization has solicited IRSN Laboratory for Neutron Metrology and Dosimetry to study the possibility to calibrate, in monoenergetic neutron fields at 14 and 2.45 MeV, the neutron detectors to be placed inside the future fusion reactor. In addition to the estimate of the necessary irradiation times, the dose equivalent rates from some of the neutron activated beam line elements had been calculated to consider the cooling time mandatory before access. Neutron activation calculations have been performed with the Fluka Monte-Carlo code. The resulting dose equivalent rates depend strongly of the neutron beam intensity as well as the neutron energy. In the worst case, for 14 MeV neutrons at an emission rate of 1012 s−1, a cooling time of 24 h would be needed for a close access to the shadow cone. Several days would be mandatory in the case of the target holder. |
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