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Modelling deuterium release from tungsten after high flux high temperature deuterium plasma exposure

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Abstract
Tungsten is a primary candidate for plasma facing materials for future fusion devices. An important safety concern in the design of plasma facing components is the retention of hydrogen isotopes. Available experimental data is vast and scattered, and a consistent physical model of retention of hydrogen isotopes in tungsten is still missing. In this work we propose a model of non-equilibrium hydrogen isotopes trapping under fusion relevant plasma exposure conditions. The model is coupled to a diffusion-trapping simulation tool and is used to interpret recent experiments involving high plasma flux exposures. From the computational analysis performed, it is concluded that high flux high temperature exposures (T = 1000 K, flux = 10(24) D/m(2)/s and fluence of 10(26) D/m(2)) result in generation of sub-surface damage and bulk diffusion, so that the retention is driven by both sub-surface plasma-induced defects (bubbles) and trapping at natural defects. On the basis of the non-equilibrium trapping model we have estimated the amount of H stored in the sub-surface region to be similar to 10 (5) at (1), while the bulk retention is about 4 x 10 (7) at (1), calculated by assuming the sub-surface layer thickness of about 10 mu m and adjusting the trap concentration to comply with the experimental results for the integral retention. (C) 2016 Elsevier B.V. All rights reserved.
Keywords
GRAIN-BOUNDARY, HYDROGEN, DIFFUSION, RETENTION, DENSITY, IRRADIATION, SURFACE

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Chicago
Grigorev, Petr, Dmitry Matveev, Anastasiia Bakaeva, Dmitry Terentyev, Evgeny E. Zhurkin, Guido Van Oost, and Jean-Marie Noterdaeme. 2016. “Modelling Deuterium Release from Tungsten After High Flux High Temperature Deuterium Plasma Exposure.” Journal of Nuclear Materials 481: 181–189.
APA
Grigorev, P., Matveev, D., Bakaeva, A., Terentyev, D., Zhurkin, E. E., Van Oost, G., & Noterdaeme, J.-M. (2016). Modelling deuterium release from tungsten after high flux high temperature deuterium plasma exposure. JOURNAL OF NUCLEAR MATERIALS, 481, 181–189.
Vancouver
1.
Grigorev P, Matveev D, Bakaeva A, Terentyev D, Zhurkin EE, Van Oost G, et al. Modelling deuterium release from tungsten after high flux high temperature deuterium plasma exposure. JOURNAL OF NUCLEAR MATERIALS. Amsterdam: Elsevier Science Bv; 2016;481:181–9.
MLA
Grigorev, Petr, Dmitry Matveev, Anastasiia Bakaeva, et al. “Modelling Deuterium Release from Tungsten After High Flux High Temperature Deuterium Plasma Exposure.” JOURNAL OF NUCLEAR MATERIALS 481 (2016): 181–189. Print.
@article{8517461,
  abstract     = {Tungsten is a primary candidate for plasma facing materials for future fusion devices. An important safety concern in the design of plasma facing components is the retention of hydrogen isotopes. Available experimental data is vast and scattered, and a consistent physical model of retention of hydrogen isotopes in tungsten is still missing. In this work we propose a model of non-equilibrium hydrogen isotopes trapping under fusion relevant plasma exposure conditions. The model is coupled to a diffusion-trapping simulation tool and is used to interpret recent experiments involving high plasma flux exposures. From the computational analysis performed, it is concluded that high flux high temperature exposures (T = 1000 K, flux = 10(24) D/m(2)/s and fluence of 10(26) D/m(2)) result in generation of sub-surface damage and bulk diffusion, so that the retention is driven by both sub-surface plasma-induced defects (bubbles) and trapping at natural defects. On the basis of the non-equilibrium trapping model we have estimated the amount of H stored in the sub-surface region to be similar to 10 (5) at (1), while the bulk retention is about 4 x 10 (7) at (1), calculated by assuming the sub-surface layer thickness of about 10 mu m and adjusting the trap concentration to comply with the experimental results for the integral retention. (C) 2016 Elsevier B.V. All rights reserved.},
  author       = {Grigorev, Petr and Matveev, Dmitry and Bakaeva, Anastasiia and Terentyev, Dmitry and Zhurkin, Evgeny E. and Van Oost, Guido and Noterdaeme, Jean-Marie},
  issn         = {0022-3115},
  journal      = {JOURNAL OF NUCLEAR MATERIALS},
  language     = {eng},
  pages        = {181--189},
  publisher    = {Elsevier Science Bv},
  title        = {Modelling deuterium release from tungsten after high flux high temperature deuterium plasma exposure},
  url          = {http://dx.doi.org/10.1016/j.jnucmat.2016.09.019},
  volume       = {481},
  year         = {2016},
}

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