The exhaust of excessively high heat and particle fluxes on the divertor target is crucial for EAST long-pulse operation. In the recent EAST experiments, stable partial energy detachment around the upper outer strike point with H _98,y2 ∼ 1 was achieved with either Ne or Ar seeding from the upper outer divetor target in the upper single null configuration with ITER-like tungsten divertor. With either Ar or Ne seeding, the electron temperature around the upper outer strike point (T _et,UOSP) was maintained at around 5eV, the peak temperature of divertor target surface around the upper outer strike point (T _div,UO) decreased significantly, and material sputtering was well suppressed. It was observed that there was less Ar seeding needed for partial energy detachment onset than Ne seeding, which shows that Ar is more efficient in the cooling of T _et on the upper outer divertor than Ne. However, there was no detachment on the upper inner divertor with T _et around strike point (T _et,UISP) remaining >10eV with either Ar or Ne seeding from the upper outer divertor. Accompanied with the disappearance of double peak phenomenon of ion flux density on the upper inner divertor target (j _s,UI), the peak T _div,UI around the strike point increased to around 300 C. Although the heat flux on the upper inner divertor target (q _t,UI) is still in the acceptable level, either Ar or Ne seeding only from the upper outer divertor target is not enough to protect the upper inner divertor target from sputtering under current EAST conditions. On the other hand, Ar seeding always causes confinement degradation in the partial energy detachment state. It was observed that there is a slight confinement improvement (∼10%) with Ne seeding, which may be due to density peaking, dilution effects and stabilization of the ion temperature gradient mode.

偏滤器目标上过高的热量和粒子通量的排放对于 EAST 长脉冲操作至关重要。在最近的 EAST 实验中，在具有类似 ITER 的钨偏滤器的上部单零配置中，通过从上部外部偏导器靶中注入 Ne 或 Ar 来实现H _98,y2 ∼ 1周围上部外撞击点的稳定部分能量分离。无论是 Ar 还是 Ne_引晶种，上外撞击点 ( T _et,UOSP )周围的电子温度保持在 5eV 左右，上外撞击点附近偏滤器靶表面的峰值温度 ( T _div,UO) 显着降低，材料溅射得到很好的抑制。据观察，部分能量脱离开始所需的 Ar 晶种比 Ne 晶种少，这表明 Ar 在冷却上部外偏滤器上的T _et时比 Ne更有效。然而，有在与上内偏滤器没有脱离Ť _等周围击点（Ť _等，UISP）剩余> 10EV与任一Ar或氖从上部外偏滤器播种。伴随着上部内偏滤器靶（j _s,UI）上离子通量密度双峰现象的消失，峰T _div,UI撞击点附近增加到 300 C 左右。虽然上部内偏滤器靶上的热通量 ( q _t,UI ) 仍处于可接受的水平，但仅从上部外偏滤器靶中注入 Ar 或 Ne 不足以保护在当前 EAST 条件下溅射的上部内部偏滤器靶。另一方面，在部分能量脱离状态下，Ar 晶种总是导致约束退化。据观察，Ne 晶种的限制略有改善（~10%），这可能是由于密度峰值、稀释效应和离子温度梯度模式的稳定性。