Compositions and chemical states on the co-deposition layer of lithiated tungsten of plasma-facing components of EAST
Compositions and chemical states on the co-deposition layer of lithiated tungsten of plasma-facing components of EAST
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EAST 面向等离子体组件的锂化钨共沉积层的成分和化学状态
DOI：
10.1016/j.nme.2017.02.002
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发表时间：
2017-08
影响因子：
2.6
通讯作者：
Ding H.
中科院分区：
文献类型：
--
作者：
Ding H.;Li C.;Wang Y.;Wu X.;Li H.;Hu J.;Chen J.;Luo G.-N.;Ding H.
锂化有利于通过经由锂（Li）壁调节减少氢和杂质再循环来增强EAST中的等离子体性能。在EAST托卡马克装置中，高Z材料如钨（W）已被选作上偏滤器。然而，Li-W共沉积层的化学组成和状态的本质仍然不清楚。本文利用级联电弧线性等离子体发生器进行了带Li沉积层的纯W面向等离子体元件的实验研究。研制了空间分辨率约为1 mm、深度分辨率约为200 nm的激光诱导击穿光谱（LIBS）系统，用于对Li-W共沉积层的成分和分布进行真实的实时监测。共沉积层和激光烧蚀点的化学状态通过X射线光电子能谱（XPS）的事后分析来确定。LIBS和XPS结果都表明，在靠近Li源的区域可以观察到较高的Li浓度。XPS谱表明，Li分布对Li 2CO 3在289 eV和531.6 eV处的峰强度有明显影响。此外，在锂化的W样品中，在Li-W共沉积层的表面上形成了高比例的W氧化物。激光烧蚀斑对应的元素W信号比未激光烧蚀的Li-W共沉积层表面区域明显得多。这一工作有助于加深对EAST装置钨偏滤器锂壁条件作用的理解。
Lithiation is beneficial to enhance plasma performance in EAST by reducing hydrogen and impurities recycling via lithium (Li) wall conditioning. High-Z materials like tungsten (W) have been selected as up–divertor in EAST tokamak. However, the nature of the chemical compositions and states on Li-W co-deposition layer is still unclear. In this paper, pure W plasma-facing component experiments with Li deposition layer were carried out by a cascaded-arc linear plasma generator. An in-situ laser-induced breakdown spectroscopy (LIBS) system with spatial resolution about 1 mm and depth resolution about 200 nm was developed to real time monitor the composition and distribution on Li-W co-deposition layer. The chemical states of the co-deposition layer and laser ablation spots were determined by a post-mortem analysis of X-ray photoelectron spectroscopy (XPS). Both LIBS and XPS results shew that higher concentration of Li could be observed at the region closed to the Li source. The XPS spectra indicated that Li2CO3peaks intensities at 289 eV and 531.6 eV were obviously changed with the Li distribution. In addition, high proportional W oxides were formed on the surface of Li-W co-deposition layer in the lithiated W sample. Elemental W signals corresponding to the laser ablation spots were much more obvious than them in the area of Li-W co-deposition layer surface without laser ablation. This work could improve the understanding of the Li-wall conditioning for tungsten divertor in EAST tokamak.
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影响因子：
3.3
作者：
M. Hoen;B. Tyburska-Pueschel;K. Ertl;M. Mayer;J. Rapp;A. Kleyn;P. Zeijlmans van Emmichoven
通讯作者：
M. Hoen;B. Tyburska-Pueschel;K. Ertl;M. Mayer;J. Rapp;A. Kleyn;P. Zeijlmans van Emmichoven
使用激光诱导击穿光谱研究暴露于高通量氘等离子体的锂化钨的氘保留
影响因子：
1.7
作者：
Zhang, Chenfei;Ding, Hongbin;De Temmerman, G.;van der Meiden, H. J.
通讯作者：
van der Meiden, H. J.
通过激光烧蚀分析和去除 ITER 相关材料和沉积物
影响因子：
3.1
作者：
Niels Gierse;Philippe Mertens;Ran Hai;Hongbin Ding
通讯作者：
Hongbin Ding
影响因子：
2.2
作者：
J. Allain;C. Taylor
通讯作者：
J. Allain;C. Taylor
影响因子：
3.1
作者：
J. Allain;D. Rokusek;S. S. Harilal-S.;M. Nieto-Pérez;C. Skinner;H. Kugel;B. Heim;R. Kaita;R. Maje
通讯作者：
J. Allain;D. Rokusek;S. S. Harilal-S.;M. Nieto-Pérez;C. Skinner;H. Kugel;B. Heim;R. Kaita;R. Maje