Deuterium transport in ITER-grade tungsten

Byeon, W.J.; Noh, S. J.

doi:10.1016/j.jnucmat.2020.152675

Cited by 7 publications

(1 citation statement)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Transportation of hydrogen isotopes (HIs) in materials has been attracted much attention in fields like nuclear energy and hydrogen energy in recent years. In the context of nuclear fusion, understanding HIs transportation is an important issue from the viewpoint of economy and security [1,2]. It could affect many key processes in the operation of a fusion device: the balance of HIs into and out of the plasma-facing materials (PFMs) determines the stability of the fuel recycling process and therefore affects the stable operation of the core plasma, the retention of HIs in the bulk reduces the self-sustaining ability of tritium, and the permeation of tritium into the coolant leads to the formation of tritiated water which is extremely difficult to be dealt with because of its acidity.…”

Section: Introductionmentioning

confidence: 99%

Modelling of deuterium diffusion and thermal desorption in tungsten exposed to high-flux deuterium plasma

Sun,

Cheng,

Zhou

et al. 2023

Mater. Res. Express

View full text Add to dashboard Cite

In nuclear fusion, hydrogen isotopes transportation in tungsten has been identified as a crucial process which could affect various key processes in the operation of a fusion device, such as tritium self-sustaining and operational safety. To enhance the understanding of deuterium diffusion and trapping in millimeter-thick tungsten under high-flux plasma conditions, we carried out a systematic simulation investigation on the deuterium plasma exposure and subsequent thermal desorption using the TMAP7 code based on experimental results. The simulation reveals that the defect concentration with a low de-trapping energy , as estimated solely from simulating thermal desorption, is lower than its actual density due to the temperature history of plasma exposure and subsequent cooling processes. Moreover, the growth rate of deuterium mobile concentration exhibits nonmonotonic behavior over time during plasma exposure, which strongly depends on the ratio of defect concentration with a high de-trapping energy to that with a low de-trapping energy. Additionally, we observed that the maximum deuterium diffusion depth does not follow a proportional relationship with the square root of exposure time, which is attributed to the growing number of plasma-induced defects and the reducing injection coefficient with increasing fluences. This work provides valuable insights into the understanding of deuterium transportation in tungsten during high-flux plasma exposure which could contribute to understanding and modelling of hydrogen isotopes recycling in future fusion devices.

show abstract

Section: Introductionmentioning

confidence: 99%