Dynamical saturated concentration of deuterium in a beryllium foil studied by low energy D(d,p)T reaction

Zhao, Jiangtao; Wang, Q.; Wang, T.S.; Xu, Xin; Zhang, S.; Zhou, Yadong; Guan, Xin; Fang, Kan; Kasagi, J.

doi:10.1016/j.nimb.2013.08.028

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…Older data also focusing on co-deposits reported values in the range D/Be = 0.1-0.4 [8][9][10]. Values in the range D/Be = 0.2-0.4 have been measured under ion implantation of 20 keV D −1 with 10 19 D cm −2 [11]. For 9 keV D −1 implantation, a storage of D as D 2 molecules has been reported in bubbles tending to interconnect in the material [12].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen retention in beryllium: concentration effect and nanocrystalline growth

Pardanaud

Rusu

Martin

et al. 2015

J. Phys.: Condens. Matter

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We herein report on the formation of BeD2 nanocrystalline domes on the surface of a beryllium sample exposed to energetic deuterium ions. A polycrystalline beryllium sample was exposed to D ions at 2 keV/atom leading to laterally averaged deuterium areal densities up to 3.5 10(17) D cm(-2), and studied using nuclear reaction analysis, Raman microscopy, atomic force microscopy, optical microscopy and quantum calculations. Incorporating D in beryllium generates a tensile stress that reaches a plateau at ≈1.5 10(17) D cm(-2). For values higher than 2.0 10(17) cm(-2), we observed the growth of ≈90 nm high dendrites, covering up to 10% of the surface in some zones of the sample when the deuterium concentration was 3 × 10(17) D cm(-2). These dendrites are composed of crystalline BeD2, as evidenced by Raman microscopy and quantum calculations. They are candidates to explain low temperature thermal desorption spectroscopy peaks observed when bombarding Be samples with D ions with fluencies higher than 1.2 10(17) D cm(-2).

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Section: Introductionmentioning

confidence: 99%

Hydrogen retention in beryllium: concentration effect and nanocrystalline growth

Pardanaud

Rusu

Martin

et al. 2015

J. Phys.: Condens. Matter

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“…This explains why several studies based on ion irradiation of Be samples have been devoted to D behavior to ensure that tritium retention will not be a limiting issue in ITER operations. Previous studies found D/Be ratio in the range 0.1-0.7 using energies in the range 0.6-20 keV/D and fluency in the range 10 16 -10 19 cm −2 [76][77][78][79][80][81][82].…”

Section: Contextmentioning

confidence: 91%

Raman Microscopy: A Suitable Tool for Characterizing Surfaces in Interaction with Plasmas in the Field of Nuclear Fusion

Pardanaud¹,

Martin²,

Roubin³

2017

Raman Spectroscopy and Applications

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Raman microscopy, which is sensitive to chemical bonds, defects, structure, is a suitable tool that can give information on how a material can be modified by interacting with ions. We will first give concrete examples on how it can be used to characterize with a micrometric resolution samples extracted from tokamaks. We will then give concrete examples on what information can be obtained by doing a study on laboratory synthesized materials, benchmarking Raman microscopy with quantitative techniques. The first part of the chapter is focused on carbon-based material analysis. We will show how Raman spectra are sensitive to the presence of hydrogen, a major safety issue in the field. The second part of the chapter will be focused on beryllium-and tungsten-based material analysis. We will show that hydrogen can be stored as an hydride after ion implantation and that it can be released easily in tungsten oxide.

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“…Fusions in liquid metals and entropic correlations: the Tohoku group has measured a different effective screening potential in solid and liquid lithium, and we have recently proposed that the two-body correlation gives a negative contribution to the entropy that could explain the different screening between solid and liquid metal [38] (additional details and results from the experiments of interest can be found in [39][40][41][42][43]). …”

Section: Methodsmentioning

confidence: 99%

Negentropy in Many-Body Quantum Systems

Quarati

Lissia

Scarfone

2016

Entropy

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Negentropy (negative entropy) is the negative contribution to the total entropy of correlated many-body environments. Negentropy can play a role in transferring its related stored mobilizable energy to colliding nuclei that participate in spontaneous or induced nuclear fusions in solid or liquid metals or in stellar plasmas. This energy transfer mechanism can explain the observed increase of nuclear fusion rates relative to the standard Salpeter screening. The importance of negentropy in these specific many-body quantum systems and its relation to many-body correlation entropy are discussed.

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Dynamical saturated concentration of deuterium in a beryllium foil studied by low energy D(d,p)T reaction

Cited by 8 publications

References 20 publications

Hydrogen retention in beryllium: concentration effect and nanocrystalline growth

Hydrogen retention in beryllium: concentration effect and nanocrystalline growth

Raman Microscopy: A Suitable Tool for Characterizing Surfaces in Interaction with Plasmas in the Field of Nuclear Fusion

Negentropy in Many-Body Quantum Systems

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