Evaluation of local erosion and deposition on the W-monoblock of JA-DEMO divertor
We developed and performed a 3D Monte-Carlo simulation on local erosion and deposition in outer divertor target of JA-DEMO. The local erosion and deposition were evaluated considering the divertor plasma parameters and the roof shape of W-monoblocks. First, for local erosion simulation, the trajecto...
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2024-12-01
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| author | M. Oya K. Hoshino N. Asakura Y. Sakamoto N. Ohno K. Hanada |
| author_facet | M. Oya K. Hoshino N. Asakura Y. Sakamoto N. Ohno K. Hanada |
| author_sort | M. Oya |
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| description | We developed and performed a 3D Monte-Carlo simulation on local erosion and deposition in outer divertor target of JA-DEMO. The local erosion and deposition were evaluated considering the divertor plasma parameters and the roof shape of W-monoblocks. First, for local erosion simulation, the trajectories of D ions and impurity (He and Ar) ions were traced before irradiating the monoblock surface. The physical sputtering was calculated by these ions irradiation, considering their charge states, incident-energies and -angles. The highest sputtering flux was produced by multiply-charged Ar ions (Ar3+–Ar5+). The sputtering flux strongly depended on the poloidal positions along the divertor target. Although almost no erosion (sputtering) was obtained in low-temperature zone (∼1 eV), the erosion occurred in mid- (∼10 eV) and high-temperature (>10 eV) zone. Second, for local deposition simulation, the trajectories of W atoms emitted from the monoblock surface were traced. After transport (including ionization and recombination) in the plasma, W atoms and ions were deposited on the monoblock surface. The deposition occurred even on the area where plasmas did not irradiate (shadow). This was due to perpendicular diffusion to magnetic field lines, gyro-orbit effects for W ions and straight-line motion for neutral W atoms. The poloidal distribution of the deposition fluxes was similar to that of the sputtering fluxes. In low-temperature zone, no deposition flux occurred due to very low sputtering flux. The deposition flux in mid-temperature zone increased significantly and that in high-temperature zone remained high. |
| format | Article |
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| institution | OA Journals |
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| language | English |
| publishDate | 2024-12-01 |
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| spelling | doaj-art-4e70bfb21a7e43488c20aa7af30039552025-08-20T02:34:59ZengElsevierNuclear Materials and Energy2352-17912024-12-014110179310.1016/j.nme.2024.101793Evaluation of local erosion and deposition on the W-monoblock of JA-DEMO divertorM. Oya0K. Hoshino1N. Asakura2Y. Sakamoto3N. Ohno4K. Hanada5Faculty of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 8168580, Japan; Corresponding author.Faculty of Science and Technology, Keio University, Yokohama, Kanagawa 2238522, JapanNational Institute for Quantum Science and Technology, Naka, Ibaraki 3111093, JapanNational Institute for Quantum Science and Technology, Rokkasho, Aomori 0393212, JapanGraduate School of Engineering, Nagoya University, Nagoya, Aichi 4648403, JapanResearch Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 8168580, JapanWe developed and performed a 3D Monte-Carlo simulation on local erosion and deposition in outer divertor target of JA-DEMO. The local erosion and deposition were evaluated considering the divertor plasma parameters and the roof shape of W-monoblocks. First, for local erosion simulation, the trajectories of D ions and impurity (He and Ar) ions were traced before irradiating the monoblock surface. The physical sputtering was calculated by these ions irradiation, considering their charge states, incident-energies and -angles. The highest sputtering flux was produced by multiply-charged Ar ions (Ar3+–Ar5+). The sputtering flux strongly depended on the poloidal positions along the divertor target. Although almost no erosion (sputtering) was obtained in low-temperature zone (∼1 eV), the erosion occurred in mid- (∼10 eV) and high-temperature (>10 eV) zone. Second, for local deposition simulation, the trajectories of W atoms emitted from the monoblock surface were traced. After transport (including ionization and recombination) in the plasma, W atoms and ions were deposited on the monoblock surface. The deposition occurred even on the area where plasmas did not irradiate (shadow). This was due to perpendicular diffusion to magnetic field lines, gyro-orbit effects for W ions and straight-line motion for neutral W atoms. The poloidal distribution of the deposition fluxes was similar to that of the sputtering fluxes. In low-temperature zone, no deposition flux occurred due to very low sputtering flux. The deposition flux in mid-temperature zone increased significantly and that in high-temperature zone remained high.http://www.sciencedirect.com/science/article/pii/S2352179124002163TungstenSputter erosionLocal depositionDivertorDEMOMonte Carlo simulation |
| spellingShingle | M. Oya K. Hoshino N. Asakura Y. Sakamoto N. Ohno K. Hanada Evaluation of local erosion and deposition on the W-monoblock of JA-DEMO divertor Nuclear Materials and Energy Tungsten Sputter erosion Local deposition Divertor DEMO Monte Carlo simulation |
| title | Evaluation of local erosion and deposition on the W-monoblock of JA-DEMO divertor |
| title_full | Evaluation of local erosion and deposition on the W-monoblock of JA-DEMO divertor |
| title_fullStr | Evaluation of local erosion and deposition on the W-monoblock of JA-DEMO divertor |
| title_full_unstemmed | Evaluation of local erosion and deposition on the W-monoblock of JA-DEMO divertor |
| title_short | Evaluation of local erosion and deposition on the W-monoblock of JA-DEMO divertor |
| title_sort | evaluation of local erosion and deposition on the w monoblock of ja demo divertor |
| topic | Tungsten Sputter erosion Local deposition Divertor DEMO Monte Carlo simulation |
| url | http://www.sciencedirect.com/science/article/pii/S2352179124002163 |
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