Six nominally repeat neon shattered pellet injection (SPI) shutdowns of stable DIII-D Super H-modes are studied to understand the 3D properties of the radiation and impurity transport. The radiation efficiency and radiation peaking determine whether first wall melting is expected following disruption mitigation in ITER. Previous studies make use of axisymmetric approximations to infer radiation efficiencies, but validating the high efficiency required by ITER necessitates improved accuracy, and this work contributes by exploring the 3D radiation and density structures that will inform forward modeling. When the neon shatter plume produced by the SPI reaches the plasma edge, m/n = 3/1 and 2/1 island O-points are observed to align with the injection trajectory in five out of six cases, suggesting that the injected material seeds the island O-points. Field aligned neon structures emitting Ne-I line radiation drift at 1 km s⁻¹ in the ion diamagnetic drift direction during the pre-thermal quench, tracking the motion of the m/n = 2/1 island O-point. Neon fragments penetrate to the q = 2 surface by the time of the thermal quench. Techniques to constrain the 3D emissivity are explored, and one method constrains a 3D flux tube that is consistent with the radiation data, and when mapped to the interferometers, intersects the lasers that measure the highest density. The resulting structure derived from the radiation measurements exists near the 2/1 island X-point. In five repeatable discharges, the peak of the radiation in the toroidal direction exists in a 120 toroidal sector where the injection occurs, in contrast with the outlier discharge where the toroidal peak exists in the complementary 240 toroidal sector far from the injector, and where a 50% lower density rise is observed. The n = 1 phase behavior is markedly different in the outlier discharge, suggesting a possible dependence of the radiation structure and the assimilation efficiency on MHD.

研究了稳定 DIII-D 超级 H 模式的六个名义上重复的氖破碎颗粒注入 (SPI) 关闭，以了解辐射和杂质传输的 3D 特性。辐射效率和辐射峰值决定了 ITER 中的中断缓解后是否预计会出现第一次壁面熔化。以前的研究利用轴对称近似来推断辐射效率，但验证 ITER 所需的高效率需要提高精度，而这项工作通过探索将为正向建模提供信息的 3D 辐射和密度结构做出贡献。当SPI产生的氖碎羽流到达等离子体边缘时，m / n= 3/1 和 2/1 岛 O 点在六种情况中的五种情况下观察到与注入轨迹对齐，这表明注入的材料为岛 O 点提供种子。场对齐氖结构发射 Ne-I 线辐射在预热猝灭期间在离子抗磁漂移方向上以 1 km s ^-1漂移，跟踪m / n = 2/1 岛 O 点的运动。霓虹碎片渗透到q= 2 热淬火时的表面。探索了限制 3D 发射率的技术，一种方法限制了与辐射数据一致的 3D 通量管，当映射到干涉仪时，与测量最高密度的激光相交。从辐射测量得出的结构存在于 2/1 岛 X 点附近。在五次可重复放电中，环形方向的辐射峰值存在于发生注入的 120 度环形扇区中，而异常放电中环形峰值存在于远离注入器的互补 240 环形扇区中，并且观察到密度上升低 50%。该ñ = 1 相行为在异常放电中明显不同，这表明辐射结构和同化效率可能依赖于 MHD。