Development of Electromagnetic Pellet Injector for disruption mitigation of tokamak plasma

Abstract Disruption remains to be a serious threat to large tokamaks like ITER. The injection speed of disruption mitigation systems (DMS) driven by high pressure gas is limited by the sound speed of the propellent gas. When extrapolating to ITER-like tokamaks, long overall reaction duration and shallow penetration depth due to low injection speed make it stricter for Plasma Control System to predict the impending disruptions. Some disruptions with a short warning time may be unavoidable. Thus, a fast time response and high injection speed DMS is essential for large scale devices. Electromagnetic Pellet-Injection (EMPI) system is a novel massive material injection system aiming to provide rapid and effective disruption mitigation. Based on railgun concept, EMPI can accelerate the payload to over 1000 m/s and shorten the overall reaction time to a few milliseconds. To verify the injection ability and stability of the EMPI, the prototype injector EMPI-1 has been designed and assembled. The preliminary test has been carried out using a 5.9 g armature to propel a dummy pellet and the results suggest that the EMPI configuration has a great potential to be the DMS of the large scale fusion devices.