Dynamics of small mobile helium clusters near tungsten surfaces

Hu, Lin; Hammond, Karl D.; Wirth, Brian D.; Maroudas, Dimitrios

doi:10.1016/j.susc.2014.03.020

Cited by 78 publications

(67 citation statements)

References 28 publications

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“…This correlation, much like other studies of helium bubble energetics and bubble growth in tungsten [21][22][23][24][25][26][27][28][29][30] , has been useful in developing coarse-grained models of helium transport and surface morphological evolution in tungsten [31][32][33][34][35][36] . However, the correlation in Eq.…”

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confidence: 71%

Theoretical Model of Helium Bubble Growth and Density in Plasma-Facing Metals

Hammond

Maroudas

Wirth

2020

Sci Rep

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We present a theoretically-motivated model of helium bubble density as a function of volume for high-pressure helium bubbles in plasma-facing tungsten. the model is a good match to the empirical correlation we published previously [Hammond et al., Acta Mater. 144, 561-578 (2018)] for small bubbles, but the current model uses no adjustable parameters. The model is likely applicable to significantly larger bubbles than the ones examined here, and its assumptions can be extended trivially to other metals and gases. We expect the model to be broadly applicable and useful in coarse-grained models of gas transport in metals.

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confidence: 71%

Theoretical Model of Helium Bubble Growth and Density in Plasma-Facing Metals

Hammond

Maroudas

Wirth

2020

Sci Rep

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“…In addition, trap mutation reactions [37,38] have been considered. These trap mutation reactions, enhanced near the irradiation surface [39][40][41], constitute an efficient way of He trapping (Hen → HenV + I). The maximum He/V ratio allowed in these simulations is 9, i.e., He9mVm clusters.…”

Section: Simulation Methodsmentioning

confidence: 99%

Temperature dependence of underdense nanostructure formation in tungsten under helium irradiation

Valles

Martín-Bragado

Nordlund

et al. 2017

Journal of Nuclear Materials

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Recently, tungsten has been found to form a highly underdense nanostructured morphology ("W fuzz") when bombarded by an intense flux of He ions, but only in the temperature window 900-2000 K. Using object kinetic Monte Carlo simulations (pseudo-3D simulations) parameterized from first principles, we show that this temperature dependence can be understood based on He and point defect clustering, cluster growth, and detrapping reactions. At low temperatures (<900 K), fuzz does not grow because almost all He is trapped in very small He-vacancy clusters. At high temperatures (>2300 K), all He is detrapped from clusters, preventing the formation of the large clusters that lead to fuzz growth in the intermediate temperature range.

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“…Sefta et al [11,12] suggested that the accumulation of surface adatom islands resulting from single self-interstitial migration, bubble bursting and prismatic loop punching were responsible for the initial stages of fuzz formation. Hu et al [13] studied the trap mutation and dissociation of He clusters in the near-surface region of tungsten, which has significant impact on the W surface morphology and near-surface structure. More recently, Sandoval et al [14] have studied the growth process of He bubbles in W and found that the evolution of surface morphology is very sensitive to the growth rate of He bubbles.…”

Section: Introductionmentioning

confidence: 99%