Effect of impurities on the erosion behavior of beryllium under steady-state deuterium plasma bombardment

Hirooka, Y.; Won, J.; Boivin, R. L.; Sze, D.K.; Neumoin, V. E.

doi:10.1016/0022-3115(95)00166-2

Cited by 13 publications

(5 citation statements)

References 4 publications

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“…The sputtering yields calculated by MD calculations for the different incident energies and temperatures are reported in figure 3 and are correlated to the evolution of c D with temperature. Experimental data at room temperature on oxidized Be samples [22,24] and sintered BeO [23] are also reported. For all energies, Y BeO increases from 300 K to 500 K as c D is constant, and as soon as c D decreases, Y BeO decreases as well.…”

Section: Evolution Of Y Beo With the Temperaturementioning

confidence: 99%

Sputtering of beryllium oxide by deuterium at various temperatures simulated with molecular dynamics

Hodille¹,

Byggmästar²,

Safi³

et al. 2020

Phys. Scr.

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The sputtering yield of beryllium oxide (BeO) by incident deuterium (D) ions, for energies from 10 eV to 200 eV, has been calculated for temperatures between 300 K and 800 K using classical molecular dynamics. First, cumulative irradiations are done to build up a concentration of D in the material, equal to the one experimentally measured, that varies from 0.12 atomic fraction (300 K -500 K) to 0.02 atomic fraction (800 K). After building up the concentration of D, non-cumulative irradiations are done to estimate the sputtering yields of BeO. For all incident energies, the sputtering yield peaks at 500 K, being closely related to the decrease of the concentration of D above this temperature. While for 10 eV, the concentration of D on the surface drives the temperature dependence, above 30 eV, it is the amount of surface damage created during the cumulative irradiation.

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Section: Evolution Of Y Beo With the Temperaturementioning

confidence: 99%

Sputtering of beryllium oxide by deuterium at various temperatures simulated with molecular dynamics

Hodille¹,

Byggmästar²,

Safi³

et al. 2020

Phys. Scr.

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“…For the non-cumulative irradiation, Y X is estimated by averaging the number of sputtered X atoms over incoming D ions. The MD sputtering yields are compared to experimental data that have been obtained with oxidized Be samples [38,39] and sintered solid BeO [40] at room temperature. 3.1.1.…”

Section: Sputtering Of Be and O Atomsmentioning

confidence: 99%

“…The sputtering yields for the limited cumulative irradiation (c-limited) are also shown. The MD data are compared to experimental data: exp a :[38] exp b :[40] exp c :[39]…”

mentioning

confidence: 99%

Molecular dynamics simulation of beryllium oxide irradiated by deuterium ions: sputtering and reflection

Hodille¹,

Byggmästar²,

Safi³

et al. 2019

J. Phys.: Condens. Matter

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The sputtering and reflection properties of wurtzite beryllium oxide (BeO) subjected to deuterium (D) ions bombardment at 300 K with ion energy between 10 eV and 200 eV is studied by classical molecular dynamics. Cumulative irradiations of wurtzite BeO show a D concentration threshold above which an 'unphysical dramatic' sputtering is observed. From the cumulative irradiations, simulation cells with different D concentrations are used to run non-cumulative irradiations at different concentrations. Using a D concentration close to the experimentally determined saturation concentration (0.12 atomic fraction), the simulations are able to reproduce accurately the experimental sputtering yield of BeO materials. The processes driving the sputtering of beryllium (Be) and oxygen (O) atoms as molecules are subsequently determined. At low irradiation energy, between 10 eV and 80 eV, swift chemical sputtering is dominant and produces mostly ODz molecules. At high energy, the sputtered molecules are mostly BexOy molecules (mainly BeO dimer). Four different processes are associated to the formation of such molecules: the physical sputtering of BeO dimer, the delayed swift chemical sputtering not involving D ions and the detachmentinduced sputtering. The physical sputtering of BeO dimer can be delayed if the sputtering event implies two interactions with the incoming ion (first interaction in its way in the material, the other in its way out if it is backscattered). The detachment-induced sputtering is a characteristic feature of the 'dramatic' sputtering and is mainly observed when the concentration of D is close to the threshold leading to this sputtering regime.

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“…Finally, erosion terms due to asymmetries and off-normal events, such as ELMs [11], also contribute to the distribution of impurities throughout the ITER vessel. From the surface loss rate perspective, the surface temperature of the bombarded material is a critical factor in determining the chemical processes acting in the surface [12] and the resultant morphology of the exposed surface [13]. The creation of mixed-material compounds in the surface of plasma-exposed materials can potentially alter the thermal conductivity of these surfaces and thereby make reliable predictions of the surface temperature doubtful.…”

Section: Introductionmentioning

confidence: 99%

The implications of mixed-material plasma-facing surfaces in ITER

Doerner

2007

Journal of Nuclear Materials

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Effect of impurities on the erosion behavior of beryllium under steady-state deuterium plasma bombardment

Cited by 13 publications

References 4 publications

Sputtering of beryllium oxide by deuterium at various temperatures simulated with molecular dynamics

Sputtering of beryllium oxide by deuterium at various temperatures simulated with molecular dynamics

Molecular dynamics simulation of beryllium oxide irradiated by deuterium ions: sputtering and reflection

The implications of mixed-material plasma-facing surfaces in ITER

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