To investigate the optimal scenario of impurity seeding to obtain divertor plasma detachment for target protection, experiments with Ar&D₂ seeding from two different poloidal locations, the upper outer (UO) divertor target and lower outer (LO) target, were carried out on EAST. Partial energy detachment (the electron temperature near the strike point T _e,spt ⩽ 10 eV) were obtained with Ar&D₂ mixture puffing from the UO target and, for the first time, from the LO target into H-mode plasmas in the upper single null (USN) configuration. The peak heat flux q _t on the UO target was significantly reduced (by ∼80%). The rollover of ion flux density j _s did not appear probably due to insufficient momentum loss, which is independent of the puff locations. The poloidal asymmetries of particle and heat fluxes on the targets have also been investigated. The UO-dominant asymmetry of particle flux was reversed, while the UO-dominant asymmetry of heat flux was mitigated but not reversed. The plasma confinement dropped by only 14% and 8.2% in the LO-puff case and UO-puff case, respectively, during detachment. The high level of C may contributed greatly to the higher radiation in the bulk plasma region and the greater decline in W _MHD in the LO-puff case.

为了研究杂质播种以获得偏滤器等离子体脱离以保护目标的最佳方案，在 EAST 上进行了来自两个不同极向位置的Ar&D ₂播种实验，即上外 (UO) 偏滤器目标和下外 (LO) 目标。部分能量脱离（撞击点T _e,spt ⩽ 10 eV附近的电子温度）是通过从 UO 靶中喷出的Ar&D ₂混合物获得的，并且第一次从 LO 靶进入上单层中的 H 模式等离子体。空 (USN) 配置。UO 目标上的峰值热通量q _t显着降低（约 80%）。离子通量密度j _s的翻转没有出现可能是由于动量损失不足，这与抽吸位置无关。还研究了目标上的粒子和热通量的极向不对称性。粒子通量的 UO 主导的不对称性被逆转，而热通量的 UO 主导的不对称性得到缓解但没有逆转。在分离过程中，LO-puff 和 UO-puff 的等离子体约束分别仅下降了 14% 和 8.2%。高水平的 C 可能对体等离子体区域中更高的辐射和LO-puff 情况下W _MHD的更大下降有很大贡献。