Shattered pellet injection (SPI) systems that form cryogenic pellets in a pipe-gun for injection of material to mitigate disruptions have been fabricated and installed for use in thermal mitigation and runaway electron (RE) dissipation experiments on JET and KSTAR. These systems are to support disruption mitigation research for ITER and are based on an ORNL three-barrel design for flexibility in pellet size selection and variable pellet composition studies. The SPI systems for JET and KSTAR have a common feature of the barrels being collimated into a single injection line that enters the vacuum vessel. The pellets are shattered in bent stainless steel tubes that are mounted inside the vacuum vessel of the tokamak, vertically on JET and horizontally on KSTAR. The JET installation has the unique feature of vertical SPI mounting and injection with the shatter plume aimed toward the inner wall to intercept known RE beam locations generated from argon gas injection induced disruptions. The KSTAR SPI installation has two identical SPIs that are mounted on the midplane 180 degrees apart with identical injection lines and shatter tubes aimed at the plasma magnetic axis. Installation and operation of these SPI systems has provided useful lessons learned in the implementation of this SPI technology and valuable experience in optimizing the formation and firing of the pellets to optimize the physics performance.

破碎弹丸注射 (SPI) 系统在管枪中形成低温弹丸以注入材料以减轻中断，已制造并安装用于 JET 和 KSTAR 上的热缓解和失控电子 (RE) 耗散实验。这些系统将支持 ITER 的干扰缓解研究，并基于 ORNL 三桶设计，可灵活选择颗粒尺寸和可变颗粒成分研究。用于 JET 和 KSTAR 的 SPI 系统有一个共同特点，即桶被准直成一条进入真空容器的注射线。颗粒在弯曲的不锈钢管中破碎，不锈钢管安装在托卡马克真空容器内，垂直在 JET 上，水平在 KSTAR 上。JET 安装具有垂直 SPI 安装和注入的独特功能，粉碎羽流指向内壁，以拦截由氩气注入引起的中断产生的已知 RE 束位置。KSTAR SPI 装置有两个相同的 SPI，它们以 180 度间隔安装在中板上，并具有相同的注入线和瞄准等离子体磁轴的破碎管。这些 SPI 系统的安装和运行为实施该 SPI 技术提供了有用的经验教训，并在优化弹丸的形成和发射以优化物理性能方面提供了宝贵的经验。KSTAR SPI 装置有两个相同的 SPI，它们以 180 度间隔安装在中板上，具有相同的注入线和瞄准等离子体磁轴的粉碎管。这些 SPI 系统的安装和运行为实施该 SPI 技术提供了有用的经验教训，并在优化弹丸的形成和发射以优化物理性能方面提供了宝贵的经验。KSTAR SPI 装置有两个相同的 SPI，它们以 180 度间隔安装在中板上，具有相同的注入线和瞄准等离子体磁轴的粉碎管。这些 SPI 系统的安装和运行为实施该 SPI 技术提供了有用的经验教训，并在优化弹丸的形成和发射以优化物理性能方面提供了宝贵的经验。