Hydrogen recycling properties of stainless steels

Wilson, Kenneth L.

doi:10.1016/0022-3115(82)90640-7

Cited by 85 publications

(12 citation statements)

References 72 publications

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“…According to Wilson (1981) measurements of kr vary with 100Ofl as predicted by Baskes, with various sticking coefficients a. The values of kr are sensitive to the ion energy distribution and to the surface conditions, such as oxygen concentration.…”

Section: Recombination Coefficientmentioning

confidence: 91%

Assessment of database for interaction of tritium with ITER plasma facing materials

Dolan¹,

Anderl²

1994

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Section: Recombination Coefficientmentioning

confidence: 91%

Assessment of database for interaction of tritium with ITER plasma facing materials

Dolan¹,

Anderl²

1994

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“…The reflection of atomic particles from solids is not only of fundamental interest but it has also gained some interest in fusion plasma physics [1]. Recent surveys of measured and computed data for particle and energy reflection coefficients as well as energy and angular distributions of backscattered particles are given in [2,3].…”

Section: Introductionmentioning

confidence: 99%

The reflection of light swift particles from heavy solid targets

Eckstein

Biersack

1983

Z Physik A

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The reflection of light particles bombarding heavy targets has been investigated with the single-collision model, which assumes straight line trajectories between the surface and the large angle scattering event upon incidence and exit of the swift particle. This model allows analytical integration, under some approximations, to yield energy and angular distributions of reflected particles as well as particle and energy reflection coefficients in terms of analytical formulae. The results are compared with data from the Monte Carlo computer program TRIM for H and He incident on Au. This comparison shows that the model can be applied for reduced energies larger than e = 5, and that it is well suited for any higher energy up to relativistic energies, in contrast to previous theoretical or empirical formulae.

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“…Recycling, the uptake and release of hydrogen from the first-wall, affects the plasma boundary layer and thus energy balance between the plasma and the external system. 5 Of particular interest for the present discussion are "refined wall models," which emphasize the details of the material response to plasma exposure. [6][7][8] Recombination, particle impact desorption of hydrogen on surfaces, and diffusion of hydrogen into the material all contribute to recycling, as illustrated in Figure 1.…”

Section: Motivationmentioning

confidence: 99%

“…A distinct signal associated with adsorbed hydrogen emerged that was consistent with hydrogen residing between atom rows. To aid in the interpretation of the experimental results, we developed a computational model to simulate ion scattering at grazing incidence [5]. For this purpose, we incorporated a simplified surface model into the Kalypso molecular dynamics code [6].…”

Section: Introductionmentioning

confidence: 99%

Fundamental hydrogen interactions with beryllium : a magnetic fusion perspective.

Wampler

Felter²,

Whaley³

et al. 2012

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Increasingly, basic models such as density functional theory and molecular dynamics are being used to simulate different aspects of hydrogen recycling from plasma facing materials [1,2]. These models provide valuable insight into hydrogen diffusion, trapping, and recombination from surfaces, but their validation relies on knowledge of the detailed behavior of hydrogen at an atomic scale. Despite being the first wall material for ITER, basic single crystal beryllium surfaces have been studied only sparsely from an experimental standpoint. In prior cases researchers used electron spectroscopy to examine surface reconstruction or adsorption kinetics during exposure to a hydrogen atmosphere [3]. While valuable, these approaches lack the ability to directly detect the positioning of hydrogen on the surface. Ion beam techniques, such as low energy ion scattering (LEIS) and direct recoil spectroscopy (DRS), are two of the only experimental approaches capable of providing this information.In this study, we applied both LEIS and DRS to examine how hydrogen binds to the Be(0001) surface. Our measurements were performed using an angle-resolved ion energy spectrometer (ARIES) to probe the surface with low energy ions (500 eV -3 keV He + and Ne + .)We were able to obtain a "scattering maps" of the crystal surface [4], providing insight on how low energy ions are focused along open surface channels. Once we completed a characterization of the clean surface, we dosed the sample with atomic hydrogen using a heated tungsten capillary. A distinct signal associated with adsorbed hydrogen emerged that was consistent with hydrogen residing between atom rows. To aid in the interpretation of the experimental results, we developed a computational model to simulate ion scattering at grazing incidence [5]. For this purpose, we incorporated a simplified surface model into the Kalypso molecular dynamics code [6]. This approach allowed us to understand how the incident ions interacted with the surface hydrogen, providing confirmation of the preferred binding site.[1] A. Allouche, Phys. Rev. B, 78 (2008) 085429.[2] R. Stumpf and P

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Hydrogen recycling properties of stainless steels

Cited by 85 publications

References 72 publications

Assessment of database for interaction of tritium with ITER plasma facing materials

Assessment of database for interaction of tritium with ITER plasma facing materials

The reflection of light swift particles from heavy solid targets

Fundamental hydrogen interactions with beryllium : a magnetic fusion perspective.

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