MD simulations of onset of tungsten fuzz formation under helium irradiation

Lasa, A.; Henriksson, Krister O. E.; Nordlund, K.

doi:10.1016/j.nimb.2012.11.029

Cited by 64 publications

(50 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Molecular dynamics (MD) is a useful simulation tool that has been used by several research groups, including ours, to investigate this tungsten surface deformation phenomenon [8][9][10][11][12]. Previous MD simulations have involved pure helium as well as mixed helium/hydrogen exposure conditions, though most work to date has focused on the helium-tungsten system.…”

Section: Introductionmentioning

confidence: 99%

A comparison of interatomic potentials for modeling tungsten–hydrogen–helium plasma–surface interactions

Cusentino

Hammond

Sefta

et al. 2015

Journal of Nuclear Materials

View full text Add to dashboard Cite

Article history:Available online xxxx a b s t r a c tWe compare the hydrogen and helium clustering characteristics of three interatomic potential energy models intended for simulation of plasma-facing materials for fusion applications. Our simulations compare a Finnis-Sinclair potential and two different Tersoff-style bond order potentials created by Juslin et al. (2005) and Li et al. (2011), respectively, with respect to both helium and hydrogen clustering behavior in tungsten. We find significant differences between the Juslin and Li potentials in terms of both hydrogen and helium clustering behavior as well as the spatial distribution of hydrogen below the surface. These simulations are an important test on the road to more accurate models of gas clustering and surface evolution of tungsten divertors in ITER and other plasma devices.

show abstract

Section: Introductionmentioning

confidence: 99%

A comparison of interatomic potentials for modeling tungsten–hydrogen–helium plasma–surface interactions

Cusentino

Hammond

Sefta

et al. 2015

Journal of Nuclear Materials

View full text Add to dashboard Cite

show abstract

“…This is a key problem, as He bubbles increase the retention of tritium in the wall, drastically influencing the long-term thermomechanical stability and creating a large radioactive inventory, with hazardous consequences and a significant increase in fuel costs. Moreover, experiments have shown that a fuzzlike nanostructure develops on the W surface under the operating conditions (temperature, He impact energy, and He flux) expected for ITER's divertor, which increases the nucleation of bubbles, the retention of hydrogen isotopes, and the production of high-Z dust [5,6].While numerous computational studies have examined He-W interactions [7][8][9][10][11][12][13][14], these correspond to unrealistically high He uptake scenarios as compared to typical experimental conditions [15]. The impact of such high rates on the microstructural evolution is unclear.…”

mentioning

confidence: 99%

“…While numerous computational studies have examined He-W interactions [7][8][9][10][11][12][13][14], these correspond to unrealistically high He uptake scenarios as compared to typical experimental conditions [15]. The impact of such high rates on the microstructural evolution is unclear.…”

mentioning

confidence: 99%

Competing Kinetics and He Bubble Morphology in W

et al. 2015

View full text Add to dashboard Cite

The growth process of He bubbles in W is investigated using molecular dynamics and parallel replica dynamics for growth rates spanning 6 orders of magnitude. Fast and slow growth regimes are defined relative to typical diffusion hopping times of W interstitials around the He bubble. Slow growth rates allow the diffusion of interstitials around the bubble, favoring the biased growth of the bubble towards the surface. In contrast, at fast growth rates interstitials do not have time to diffuse around the bubble, leading to a more isotropic growth and increasing the surface damage.

show abstract

“…Another peak was occur at higher than 2000 K, where no nanostructures were formed on the W [16]. Moreover molecule dynamics simulation suggested that the He bubble growth and des- orption are activated with increasing the temperature [17]. Thus, the He desorption increase from ∼ 800 K on Pt suggested that He diffusion and growth of He bubbles were activated on Pt surface at the temperature.…”

Section: He Plasma Irradiation To Tungsten Carbidementioning

confidence: 96%

Morphology Changes of Platinum and Tungsten Carbide by He Plasma Irradiation

Tomita

Kajita

Ohno

et al. 2018

Plasma and Fusion Research

View full text Add to dashboard Cite

Fuzz nanostructure formation on metal by helium plasma irradiation has potential in industrial application due to the increasing in surface area. We have investigated the influence on the surfaces of platinum and tungsten carbide by helium plasma irradiation. On tungsten carbide, fuzz nanostructure was formed when the surface temperature was higher than 1000 K. However, when helium irradiation was conducted at the surface temperature of 940 K or higher, tungsten carbide changed to W possibly because of radiation enhanced sublimation. On platinum, fuzz nanostructure was formed when the surface temperature was in the range of 800 -1000 K and the fluence was on the order of 10 26 m −2 . The nanostructure formation mechanism of platinum should be similar to that of tungsten, but incubation fluence of platinum was higher and the growth rate of fuzzy layer was likely to be lower than those of tungsten.

show abstract

MD simulations of onset of tungsten fuzz formation under helium irradiation

Cited by 64 publications

References 8 publications

A comparison of interatomic potentials for modeling tungsten–hydrogen–helium plasma–surface interactions

A comparison of interatomic potentials for modeling tungsten–hydrogen–helium plasma–surface interactions

Competing Kinetics and He Bubble Morphology in W

Morphology Changes of Platinum and Tungsten Carbide by He Plasma Irradiation

Contact Info

Product

Resources

About