Pellet injection device for fusion devices

摘要

PURPOSE:To provide a pellet injection device for nuclear fusion device capable of preventing the dissolution of solid hydrogen and improving the repeated injecting performance of a pellet. CONSTITUTION:An inner pipe 13 and a heat-isolating gap part 14 are provided in the inner part of an accelerated gas supply pipe 1, and the heat-insulating gap part 14 is also provided between a punched pipe 11 and an injection pipe 2 to suppress the heat penetration of an accelerated gas 17 to a nozzle 8 and a solid hydrogen forming part 5. Thus, the dissolution of solid hydrogen can be prevented, and the repeated pellet injection of several hundreds to several thousands can be performed. Further, small pellets can be supplied to a furnace at high frequency, and the more stable density control of plasma can be performed.