Radiation shielding mass saving for the magnet coils of the VISTA spacecraft |
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| Affiliation: | 1. Gazi Üniversitesi, Teknik Eg ̌itim Fakültesi, Beşevler, Ankara 06503, Turkey;2. Niǵde Üniversitesi, Mühendislik-Mimarlik Fakültesi, Niǵde, Turkey;1. School of Nuclear Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China;2. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China;1. Medical School of Yangtze University, People’s Republic of China;2. Radiobiology Research Laboratory, Singapore Nuclear Research and Safety Initiative (SNRSI), National University of Singapore, Singapore;1. Department of Nuclear Science and Technology, Xi''an Jiaotong University, Xi''an, Shaanxi, 710049, China;2. Shaanxi Key Lab. of Advanced Nuclear Energy and Technology, Xi''an Jiaotong University, China;1. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University Harbin, 150001, China;2. Nigerian Nuclear Regulatory Authority (NNRA), Abuja, Nigeria;3. Science and Technology on Reactor Design Technology, Nuclear Power Institute of China, Chengdu, 610213, China |
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| Abstract: | Radiation shielding structure of a design concept with inertial fusion energy propulsion for manned or heavy cargo deep space missions beyond earth orbit has been investigated. Fusion power deposited in the inertial confined fuel pellet debris delivers the rocket propulsion with the help of a magnetic nozzle. The nuclear heating in the super conducting magnet coils determines the radiation shielding mass of the spacecraft. It was possible to achieve considerable mass saving with respect to a recent design work, coupled with higher design limits for coil heating (up to 5 mW/cm3). The neutron and γ-ray penetration into the coils is calculated using the SN methods with a high angular resolution in (r–z) geometry in S16P3 approximation by dividing the solid space angle in 160 sectors. Total peak nuclear heat generation density in the coils is calculated as 3.143 mW/cm3 by a fusion power of 17 500 MW. Peak neutron heating density is 1.469 mW/cm3 and peak γ-ray heating density is 1.674 mW/cm3. However, volume averaged heat generation in the coils is much lower, namely 74, 163 and 337 μW/cm3 for neutron, γ-ray and total nuclear heating, respectively. The net mass of the radiation shielding for the magnet coils is 200 tonne by a total mass of 6000 tonne of the space craft. |
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