Deuterium trapping in divertor tiles of ASDEX-Upgrade

Hildebrandt, D.; Akbi, Mohamed; Jüttner, B.; Schneider, W.

doi:10.1016/s0022-3115(98)00833-2

Cited by 20 publications

(21 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This was shown in a recent study which examined near-surface D retention by NRA, total D retention by TDS and the spatial distribution of D and deposited material, in graphite tiles from the ASDEX-Upgrade divertor [722]. Earlier work [525] outer strike-points, as shown in Fig.…”

Section: Asdex-upgradementioning

confidence: 69%

“…The deuterium was observed to be present in deposited material consisting mainly of carbon, boron, H and D of non-uniform thickness due to the roughness of the substrate [722]. The total amount of H and D in the graphite divertor tiles was estimated to be about 7x10 23 atoms or about 2 g [525].…”

Section: Asdex-upgradementioning

confidence: 99%

“…On the outer divertor the deposition was discontinuous on the scale of the surface roughness [586,722], and the deposited low-Z material was found in microdepressions of the rough surface, which are shielded from reerosion, whereas adjacent protruding parts of the rough surface undergo net erosion and…”

Section: Asdex-upgradementioning

confidence: 99%

See 2 more Smart Citations

Plasma-material interactions in current tokamaks and their implications for next step fusion reactors

et al. 2001

View full text Add to dashboard Cite

The major increase in discharge duration and plasma energy in a next step DT fusion reactor will give rise to important plasma-material effects that will critically influence its operation, safety and performance. Erosion will increase to a scale of several centimetres from being barely measurable at a micron scale in today's tokamaks. Tritium co-deposited with carbon will strongly affect the operation of machines with carbon plasma facing components. Controlling plasma-wall interactions is critical to achieving high performance in present day tokamaks, and this is likely to continue to be the case in the approach to practical fusion reactors. Recognition of the important consequences of these phenomena stimulated an internationally co-ordinated effort in the field of plasma-surface interactions supporting the Engineering Design Activities of the International Thermonuclear Experimental Reactor project (ITER), and significant progress has been made in better understanding these issues. The paper reviews the underlying physical processes and the existing experimental database of plasma-material interactions both in tokamaks and laboratory simulation facilities for conditions of direct relevance to next step fusion reactors. Two main topical groups of interaction are considered: (i) erosion/redeposition from plasma sputtering and disruptions, including dust and flake generation and (ii) tritium retention and removal. The use of modelling tools to interpret the experimental results and make projections for conditions expected in future devices is explained. Outstanding technical issues and specific recommendations on potential R&D avenues for their resolution are presented.

show abstract

Section: Asdex-upgradementioning

confidence: 69%

Section: Asdex-upgradementioning

confidence: 99%

See 1 more Smart Citation

Plasma-material interactions in current tokamaks and their implications for next step fusion reactors

et al. 2001

View full text Add to dashboard Cite

show abstract

“…The deuterium inventory in plasma-sprayed tungsten coatings on graphite divertor tiles of ASDEX Upgrade was analyzed after 800 plasma discharges and 6 boronizations [7]. It was found that in some areas the tungsten was covered with a deposit consisting mainly of carbon, boron and hydrogen isotopes.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Retention In Plasma-Sprayed Tungsten

Голубева

Kurnaev

Mayer

et al. 2006

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract.Deuterium retention in plasma-sprayed tungsten (PSW) was investigated by means of the thermodesorption technique. . The observed retention in PSW is four times higher than in polycrystalline tungsten (PCW). An additional high-temperature peak was found in the thermodesorption spectra of PSW (at 1050 K). The nature of the high-temperature peak and the mechanism of higher retention in PSW are discussed.

show abstract

“…Since W divertors were used in ASDEX-Upgrade [3] and planned for ITER hydrogen retention in the W divertors has been a key issue. Recently, influences on the hydrogen retention by material-mixing with plasma impurities are examined intensively.…”

Section: Inroductionmentioning

confidence: 99%

Interstitial Diffusion of C Interacting with Ambient H in Tungsten Crystals

Kato

Iwakiri

Morishita

et al. 2011

Plasma and Fusion Research

View full text Add to dashboard Cite

Negative binding energies between interstitial C (octahedral) and H (tetrahedral) in a bulk crystal of W (bcc) were obtained with the first-principle calculations, which indicate repulsive interaction in the interstitial C-H pair. The electron cloud associated to the each interstitial atom was analyzed with Bader's method. This analysis gives negative fractional charges of −0.35 and −0.37 for the interstitial C and H, respectively, supporting the repulsive interaction between them. Interstitial diffusion of C was studied including influences of ambient H atoms in the mean field approximation and the ergodic assumption. The calculated diffusion coefficients are significantly increased by the repulsive interaction with the H atoms.

show abstract

Deuterium trapping in divertor tiles of ASDEX-Upgrade

Cited by 20 publications

References 3 publications

Plasma-material interactions in current tokamaks and their implications for next step fusion reactors

Plasma-material interactions in current tokamaks and their implications for next step fusion reactors

Hydrogen Retention In Plasma-Sprayed Tungsten

Interstitial Diffusion of C Interacting with Ambient H in Tungsten Crystals

Contact Info

Product

Resources

About