Investigation of 3D elemental distribution on the dome surface of HL-2A divertor by laser-induced breakdown spectroscopy

IF 2 3区物理与天体物理 Q3 OPTICS Applied Physics B Pub Date : 2025-03-10 DOI:10.1007/s00340-025-08435-w

X. R. Huangfu, D. Zhao, D. Wu, J. Liu, Y. He, X. Shi, J. Han, L. Gao, L. Cai, J. Wang, J. Gao, C. Ke, H. Ding

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Abstract

In this work, three-dimensional (3D) diagnostics of the graphite tile surface elements in the dome region of the HL-2A divertor in both poloidal and toroidal directions were investigated using laser-induced breakdown spectroscopy (LIBS) technology under simulated HL-2A vacuum conditions. LIBS spectroscopic analysis revealed the presence of impurity elements such as Si, Cu, Ca, Al, Fe, Cr, Ni, and Mn on the graphite tile surface. Depth profile results of the impurity deposited layer on the shoulder part of graphite tile showed that Fe, Cr, Ni, and Mn emission intensities gradually decreased and disappeared with depth. The Si, Cu, Ca, and Al initially increased, then decreased, and eventually disappeared in the depth profile. Two-dimensional (2D) depth profile results of impurity elements in the poloidal direction showed significant asymmetry in impurity deposition within 70 mm of the shoulder and 20 mm from the top, and the impurity layer thickness on the shoulder greater than that on the top (approximately 5.7 μm vs. 3.1 μm). Further 3D imaging of the surface elements of the HL-2A divertor demonstrated strong asymmetry of impurity elements on the graphite tile surface in the poloidal direction, but no significant asymmetry was observed in the toroidal direction within 50 mm.

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激光诱导击穿光谱法研究HL-2A导流器圆顶表面三维元素分布

在模拟HL-2A真空条件下，利用激光诱导击穿光谱（LIBS）技术，研究了HL-2A导流器顶盖区石墨瓦表面元素在极向和环向的三维（3D）诊断。LIBS光谱分析显示石墨瓦表面存在Si、Cu、Ca、Al、Fe、Cr、Ni、Mn等杂质元素。石墨瓦肩部杂质堆积层的深度剖面结果表明，Fe、Cr、Ni、Mn的发射强度随着深度的增加逐渐减小并消失。Si、Cu、Ca、Al在深度剖面上呈先升高后降低的趋势，最终趋于消失。杂质元素极向二维深度剖面结果显示，在离肩70 mm和离顶20 mm范围内杂质沉积存在明显的不对称性，且肩处杂质层厚度大于顶部（约5.7 μm vs. 3.1 μm）。进一步对HL-2A导流器表面元素进行三维成像，发现石墨瓦表面杂质元素在极向方向上存在较强的不对称性，但在环向50 mm范围内未发现明显的不对称性。

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来源期刊

Applied Physics B 物理-光学

CiteScore

4.00

自引率

4.80%

发文量

202

审稿时长

3.0 months

期刊介绍： Features publication of experimental and theoretical investigations in applied physics Offers invited reviews in addition to regular papers Coverage includes laser physics, linear and nonlinear optics, ultrafast phenomena, photonic devices, optical and laser materials, quantum optics, laser spectroscopy of atoms, molecules and clusters, and more 94% of authors who answered a survey reported that they would definitely publish or probably publish in the journal again Publishing essential research results in two of the most important areas of applied physics, both Applied Physics sections figure among the top most cited journals in this field. In addition to regular papers Applied Physics B: Lasers and Optics features invited reviews. Fields of topical interest are covered by feature issues. The journal also includes a rapid communication section for the speedy publication of important and particularly interesting results.