The net erosion and deposition patterns in the inner and outer divertor of WEST were determined after different experimental campaigns (C3 and C4) of the first operational phase using ion beam analyses and scanning electron microscopy techniques. The analyses were performed on four entire tiles from inertially cooled, W-coated divertor units with an additional Mo marker coating covered with a further W coating. Strong erosion occurred at the expected location of the inner and outer strike line area with a campaign-averaged net erosion rate of >0.1 nm s⁻¹. On the high field side of the inner strike line area, thick deposited layers were found (>10 μm; growth rate >1 nm s⁻¹), mainly composed of B, C, O, and W. Additionally, strong arcing was observed in this region. At the end of the C4 campaign, He discharges were performed to study the He-W interaction. Although the conditions for nanotendrils, i.e. fuzz formation were fulfilled around the outer strike line position, neither nanotendrils nor He bubbles (>10 nm) were observed at this area.

WEST 内部和外部偏滤器的净侵蚀和沉积模式是在第一操作阶段的不同实验活动（C3 和 C4）之后使用离子束分析和扫描电子显微镜技术确定的。对来自惯性冷却、W 涂层偏滤器单元的四块整块瓷砖进行了分析，该偏滤器单元带有一个额外的 Mo 标记涂层，上面覆盖着另一个 W 涂层。强烈侵蚀发生在内部和外部走向线区域的预期位置，运动平均净侵蚀速率>0.1 nm s ^-1。在内侧走向线区域的高场端，厚的沉积层被发现（> 10 μ米;生长速率> 1nm的小号^-1)，主要由 B、C、O 和 W 组成。此外，在该区域观察到强电弧。在 C4 活动结束时，进行了 He 放电以研究 He-W 相互作用。尽管在外触线位置周围满足了纳米卷须的条件，即绒毛形成，但在该区域既没有观察到纳米卷须，也没有观察到 He 气泡（>10 nm）。