Fundamental aspects of deuterium retention in tungsten at high flux plasma exposure

2015 ◽  
Vol 118 (7) ◽  
pp. 074902 ◽  
Author(s):  
O. V. Ogorodnikova
Keyword(s):  
High Flux ◽  
Plasma Exposure ◽  
Deuterium Retention

scholarly journals Surface morphology and deuterium retention of tungsten after low- and high-flux deuterium plasma exposure

2014 ◽  
Vol 54 (8) ◽  
pp. 083014 ◽  
Author(s):  
M.H.J. 't Hoen ◽  
M. Balden ◽  
A. Manhard ◽  
M. Mayer ◽  
S. Elgeti ◽  
...  
Keyword(s):  
Surface Morphology ◽  
High Flux ◽  
Deuterium Plasma ◽  
Plasma Exposure ◽  
Deuterium Retention

Impact of plastic deformation on plasma induced damage and deuterium retention in tungsten

MRS Advances ◽  
2017 ◽  
Vol 2 (55) ◽  
pp. 3347-3352 ◽  
Author(s):  
A. Bakaeva ◽  
D. Terentyev ◽  
A. Dubinko
Keyword(s):  
Surface Layer ◽  
Dislocation Line ◽  
Experimental Studies ◽  
Thermal Desorption Spectroscopy ◽  
Bubble Nucleation ◽  
Dislocation Network ◽  
High Flux ◽  
Plasma Exposure ◽  
Deuterium Retention ◽  
Core Migration

ABSTRACTRecent theoretical and subsequent experimental studies suggest that the uptake and release of deuterium (D) in tungsten (W) under high flux ITER-relevant plasma exposure is controlled by dislocation microstructure. Thanks to numerical calculations, a comprehensive mechanism for the nucleation and growth of D bubbles on dislocation network was proposed. The process of bubble nucleation can be described as D atom trapping at a dislocation line, its in-core migration, the coalescence of several D atoms into a multiple cluster eventually transforming into a nano-bubble. This view implies that the initial microstructure might be crucial for D uptake and degradation of the sub-surface layer under prolonged plasma exposure. In this work, we apply several experimental techniques to investigate the microstructure and mechanical properties of surface and sub-surface layer of W in recrystallized and plastically-deformed condition exposed to the high flux plasma. We use transmission and scanning electron microscopy, thermal desorption spectroscopy as well as nano-indentation measurements.

Surface Modification and Deuterium Retention in Tungsten and Molybdenum Exposed to Low-Energy, High Flux Deuterium Plasmas

2008 ◽  
Vol 59 ◽  
pp. 42-45
Author(s):  
Vladimir K. Alimov ◽  
Wataru M. Shu ◽  
J. Roth ◽  
D.A. Komarov ◽  
Stefan Lindig ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Surface Layer ◽  
Thermal Desorption Spectroscopy ◽  
Low Energy ◽  
High Flux ◽  
Plasma Exposure ◽  
Near Surface ◽  
Exposure Temperature ◽  
Deuterium Retention ◽  
Scanning Electron

Deuterium retention in single crystal and polycrystalline tungsten and molybdenum exposed to low-energy (38200 eV/D), high ion flux (10211022 D/m2s) deuterium plasmas at various temperatures were examined with the D(3He,p)4He nuclear reaction at a 3He energy varied from 0.69 to 4.0 MeV, and with thermal desorption spectroscopy. The surface morphology was examined by scanning electron microscope. Blisters formed on the Mo surfaces under plasma exposure are significantly larger in size than those for W. The D retention in the W and Mo samples increases with the exposure temperature, reaching its maximum at about 500 and 530 K (for ion fluxes of 1021 and 1022 D/m2/s), respectively, and then decreases as the temperature grows further. For polycrystalline W and Mo exposed at temperatures above 400 K, the D retention in the bulk (far beyond the ion implanted zone) is dominant. Plastic deformation caused by deuterium super-saturation within the near-surface layer is suggested as a mechanism for blister formation and creation of defects responsible for deuterium trapping at depths up to several micrometers.

scholarly journals Comparative study of surface modification and D retention between beryllium and beryllides under high flux plasma exposure

2021 ◽  
pp. 101014
Author(s):  
M. Miyamoto ◽  
Y. Sugimoto ◽  
D. Nishijima ◽  
M.J. Baldwin ◽  
R.P. Doerner ◽  
...  
Keyword(s):  
Surface Modification ◽  
Comparative Study ◽  
High Flux ◽  
Plasma Exposure

scholarly journals Fluence Dependence of Surface Morphology and Deuterium Retention in W Bulks and Nanocrystalline W Films Exposed to Deuterium Plasma

2021 ◽  
Vol 11 (4) ◽  
pp. 1619
Author(s):  
Jing Yan ◽  
Xia Li ◽  
Kaigui Zhu
Keyword(s):  
Surface Morphology ◽  
Thermal Desorption Spectroscopy ◽  
Low Energy ◽  
High Flux ◽  
Deuterium Plasma ◽  
Vacancy Clusters ◽  
Plasma Irradiation ◽  
Deuterium Retention ◽  
Fluence Dependence ◽  
Scanning Electron

The surface morphology of pure W bulks and nanocrystalline tungsten films was investigated after exposure to a low-energy (100 eV/D), high-flux (1.8 × 1021 D·m−2s−1) deuterium plasma. Nanocrystalline tungsten films of 6 μm thickness were deposited on tungsten bulks and exposed to deuterium plasma at various fluences ranging from 1.30 × 1025 to 5.18 × 1025 D·m−2. Changes in surface morphology from before to after irradiation were studied with scanning electron microscopy (SEM). The W bulk exposed to low-fluence plasma (1.30 × 1025 D·m−2) shows blisters. The blisters on the W bulk irradiated to higher-fluence plasma are much larger (~2 µm). The blisters on the surface of W films are smaller in size and lower in density than those of the W bulks. In addition, the modifications exhibit the appearance of cracks below the surface after deuterium plasma irradiation. It is suggested that the blisters are caused by the diffusion and aggregation of the deuterium-vacancy clusters. The deuterium retention of the W bulks and nanocrystalline tungsten films was studied using thermal desorption spectroscopy (TDS). The retention of deuterium in W bulks and W films increases with increasing deuterium plasma fluence when irradiated at 500 K.

scholarly journals The high-flux effect on deuterium retention in TiC and TaC doped tungsten at high temperatures

2017 ◽  
Vol 494 ◽  
pp. 211-218 ◽  
Author(s):  
Mikhail Zibrov ◽  
Kirill Bystrov ◽  
Matej Mayer ◽  
Thomas W. Morgan ◽  
Hiroaki Kurishita
Keyword(s):  
High Temperatures ◽  
High Flux ◽  
Deuterium Retention

scholarly journals Surface morphology and deuterium retention in tungsten and tungsten–rhenium alloy exposed to low-energy, high flux D plasma

2014 ◽  
Vol 454 (1-3) ◽  
pp. 136-141 ◽  
Author(s):  
V.Kh. Alimov ◽  
Y. Hatano ◽  
K. Sugiyama ◽  
M. Balden ◽  
M. Oyaidzu ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Low Energy ◽  
High Flux ◽  
Deuterium Retention ◽  
Rhenium Alloy ◽  
And Tungsten

scholarly journals Deuterium retention in RAFM steels after high fluence plasma exposure

2017 ◽  
Vol 12 ◽  
pp. 648-654 ◽  
Author(s):  
Y. Martynova ◽  
S. Möller ◽  
M. Rasiński ◽  
D. Matveev ◽  
M. Freisinger ◽  
...  
Keyword(s):  
High Fluence ◽  
Plasma Exposure ◽  
Deuterium Retention

scholarly journals Saturation of deuterium retention in self-damaged tungsten exposed to high-flux plasmas

2012 ◽  
Vol 52 (2) ◽  
pp. 023008 ◽  
Author(s):  
M.H.J. 't Hoen ◽  
B. Tyburska-Püschel ◽  
K. Ertl ◽  
M. Mayer ◽  
J. Rapp ◽  
...  
Keyword(s):  
High Flux ◽  
Deuterium Retention
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