A Unified Model and Optimization for Deep Space Radiation Shielding Based on Proton Density
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866914205026746368 |
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| author | Zhenchao, Li Aixiang, Yang |
| author_facet | Zhenchao, Li Aixiang, Yang |
| contents | In the field of deep space radiation shielding design, traditional high-Z metals are being progressively replaced by novel low-Z materials such as hydrogenated graphene foam, polyethylene-carbon nanotube composite fibers, and boron-rich hydrogen-containing metal-organic frameworks. This transition stems from the constraints of the "gram-scale weight reduction" bottleneck. However, the mechanisms behind these materials' outstanding "lightweight performance" remain at the purely phenomenological level. To address this issue, this paper innovatively proposes a ternary coupled semi-empirical model, with "proton density" (rho_p) as the core independent variable (equivalent to electron density), establishing correlations with full absorption threshold (Eth) and proton utilization rate (eta_p). To validate the model's practicality in complex system design, we embedded it into the NSGA-II genetic algorithm (POP=20, MAXGEN=10). Under constraints of 2-5 layer structures with total thickness <=1 cm, the model's predicted optimal solutions showed an average design error of only 6.2%-8.2% compared to Geant4 heavy simulation dose results. This study provides the first quantitative physical explanation of the inherent trade-off between low-Z materials' "mass savings" and high-Z materials' "space savings." When rho_p<1 mol cm^-3, materials demonstrate extremely high proton utilization rates (eta_p reaching 60-100 MeV cm^-2 mol^-1), achieving 35%-55% mass savings. Conversely, when rho_p>1 mol cm^-3, although eta_p drops below 30 MeV cm^-2 mol^-1, its exceptionally high full absorption threshold (Eth) enables ultra-thin shielding technology. This work offers a robust, physically interpretable, and scalable design tool for multi-objective optimization of area density, thickness, and dose in deep space missions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_07430 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Unified Model and Optimization for Deep Space Radiation Shielding Based on Proton Density Zhenchao, Li Aixiang, Yang Instrumentation and Methods for Astrophysics Nuclear Experiment Applied Physics In the field of deep space radiation shielding design, traditional high-Z metals are being progressively replaced by novel low-Z materials such as hydrogenated graphene foam, polyethylene-carbon nanotube composite fibers, and boron-rich hydrogen-containing metal-organic frameworks. This transition stems from the constraints of the "gram-scale weight reduction" bottleneck. However, the mechanisms behind these materials' outstanding "lightweight performance" remain at the purely phenomenological level. To address this issue, this paper innovatively proposes a ternary coupled semi-empirical model, with "proton density" (rho_p) as the core independent variable (equivalent to electron density), establishing correlations with full absorption threshold (Eth) and proton utilization rate (eta_p). To validate the model's practicality in complex system design, we embedded it into the NSGA-II genetic algorithm (POP=20, MAXGEN=10). Under constraints of 2-5 layer structures with total thickness <=1 cm, the model's predicted optimal solutions showed an average design error of only 6.2%-8.2% compared to Geant4 heavy simulation dose results. This study provides the first quantitative physical explanation of the inherent trade-off between low-Z materials' "mass savings" and high-Z materials' "space savings." When rho_p<1 mol cm^-3, materials demonstrate extremely high proton utilization rates (eta_p reaching 60-100 MeV cm^-2 mol^-1), achieving 35%-55% mass savings. Conversely, when rho_p>1 mol cm^-3, although eta_p drops below 30 MeV cm^-2 mol^-1, its exceptionally high full absorption threshold (Eth) enables ultra-thin shielding technology. This work offers a robust, physically interpretable, and scalable design tool for multi-objective optimization of area density, thickness, and dose in deep space missions. |
| title | A Unified Model and Optimization for Deep Space Radiation Shielding Based on Proton Density |
| topic | Instrumentation and Methods for Astrophysics Nuclear Experiment Applied Physics |
| url | https://arxiv.org/abs/2511.07430 |