The EAST lower divertor features a partially implemented flat-type structure, and visible damage has been observed, particularly at the outer horizontal target location after plasma operations. This study conducts a detailed analysis of the damage to the outer horizontal target. The findings reveal instances of plastic deformation, cracking, and even tungsten flake detachment at specific locations on the outer horizontal target. Furthermore, different degrees of recrystallization are identified in the tungsten plates after plasma operations, with a more pronounced effect closer to the surface of the tungsten plates. These observations offer pertinent insights for ongoing research into the microstructural enhancement design of tungsten materials and the enhancement of crack thresholds at the W/Cu interface.

中文翻译：

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等离子操作后EAST下偏滤器外水平靶损伤行为研究

EAST 下部偏滤器采用部分实施的扁平型结构，并且已观察到明显的损坏，特别是在等离子体操作后的外部水平目标位置。本研究对外侧水平目标的损伤进行了详细分析。研究结果揭示了外部水平目标特定位置处的塑性变形、破裂甚至钨片脱落的情况。此外，在等离子操作后，在钨板中发现了不同程度的再结晶，其中靠近钨板表面的影响更为明显。这些观察结果为正在进行的钨材料微观结构增强设计和钨/铜界面裂纹阈值增强的研究提供了相关见解。