Study of deuterium reflection on tungsten material with lithium coating in EAST tokamak

IF 2.7 2区物理与天体物理 Q1 NUCLEAR SCIENCE & TECHNOLOGY Nuclear Materials and Energy Pub Date : 2024-12-01 Epub Date: 2024-12-07 DOI:10.1016/j.nme.2024.101840

Qian Long , Guoliang Xu , Rui Ding , Hui Wang , Yunjia Zhang , Ran Hai , Xue Bai , Bingfu Gao , Junling Chen

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Abstract

Lithium (Li) coating of the first wall has been used as a routine way of wall conditioning on EAST and proved to have a significant influence on particle recycling. Whereas the deuterium (D) reflection process on tungsten (W) with Li coating is not well understood. The SDTrim.SP code is employed to investigate the D reflection process on the Li-W mixed material wall surface for EAST tokamak. The study reveals that the existence of Li coating can reduce the deuterium reflection rate significantly. This reduction in reflection is influenced by both the D impact energy and the thickness of the Li overlayer. Unlike the D reflection on pure metal materials, the D reflection rate shows a non-monotonic relationship with the D impact energy. Detail analysis shows that with the increase of D impact energy, the fraction of D which can penetrate through the Li overlayer and interact with the W substrate increases, leading to a significant increase of D reflection rate. For normal EAST divertor operation conditions, a Li overlayer thickness of 30 nm is required to keep the D reflection rate at a low level. The D reflection on W with a Li-W mixed overlayer has also been investigated and discussed in this work.

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EAST托卡马克中锂包覆钨材料的氘反射研究

第一壁涂覆锂（Li）已被作为EAST的常规壁面调理方式，并被证明对颗粒回收有显著影响。而氘(D)在Li涂层钨(W)上的反射过程尚不清楚。SDTrim。采用SP程序研究了EAST托卡马克锂钨混合材料壁面上的D反射过程。研究表明，锂涂层的存在可以显著降低氘的反射率。这种反射的减少受D冲击能和Li覆盖层厚度的影响。与纯金属材料的D反射不同，D反射率与D冲击能呈非单调关系。详细分析表明，随着D冲击能量的增加，D能穿透Li覆盖层与W衬底相互作用的比例增加，导致D反射率显著增加。对于正常的EAST转流器操作条件，需要30 nm的Li层厚度来保持较低的D反射率。本文还研究和讨论了锂钨混合覆盖层对W的D反射。

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来源期刊

Nuclear Materials and Energy Materials Science-Materials Science (miscellaneous)

CiteScore

3.70

自引率

15.40%

发文量

175

审稿时长

20 weeks

期刊介绍： The open-access journal Nuclear Materials and Energy is devoted to the growing field of research for material application in the production of nuclear energy. Nuclear Materials and Energy publishes original research articles of up to 6 pages in length.