First-principles study of the impact of rhenium and osmium on the energetics of helium clusters in tungsten

被引：0
|
作者：
Zhou, Yanyao [1 ,2 ]
Huang, Gui-Yang [1 ,2 ]
Hu, Xunxiang [1 ,2 ]
机构：
[1] Sichuan Univ, Coll Phys, Chengdu 610065, Peoples R China
[2] Sichuan Univ, Key Lab High Energy Dens Phys & Technol, Minist Educ, Chengdu 610065, Peoples R China
来源：
NUCLEAR FUSION | 2025年 / 65卷 / 03期
关键词：
plasma facing material; helium clusters; first-principles study; transmutant elements; AB-INITIO; LOW-ENERGY; HIGH-FLUX; EVOLUTION; PRECIPITATION; TEMPERATURE; DISSOLUTION; MECHANISM; DYNAMICS; SURFACE;
D O I：
10.1088/1741-4326/adb1f4
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
Understanding interaction between transmutation elements and helium is critically important for precisely predicting the performance of tungsten plasma facing materials in fusion reactors. The energetics of He interstitial clusters (Hen), He interstitial- rhenium (Re)/osmium (Os) substitutional clusters (HenResub/HenOssub), He interstitial-tungsten(W)/Re/Os interstitial clusters (HenIW/Re/Os), He-vacancy-Re/Os substitutional clusters (HenV1/2Resub/HenV1/2Ossub) and He-vacancy-W/Re/Os interstitial clusters (HenV1/2 IW/Re/Os) in bulk body-centered cubic tungsten were investigated by using first-principles calculations. The critical numbers of He required for the self-trapping and trap mutation reactions were calculated with/without a neighboring Re/Os substitutional as well as for the case of a neighboring W/Re/Os interstitial present, based on both dissociation and transformation mechanisms. The trapping effects of Re/Os substitutional or W/Re/Os interstitial on the mobile small Hen clusters were discussed.
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页数：17
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