基于毛细管放电等离子体产生瞬态高热负荷的实验研究

The Type I edge-localized mode (ELM) in the Tokamak device will generate transient high thermal load, however, it is difficult to do research on the ELM thermal load directly in existing devices. In this paper, the idea of simulating the transient high thermal load of ELM based on the capillary discharge plasma was proposed. A capillary jet plasma generator with a capability of operating in repetitive frequency was firstly developed, and the charging circuit realized 1~10Hz adjustable and stable operation. An optical diagnosis system for the capillary plasma jet was established, combined with the Bartels and other spectral analysis methods. Key parameters such as plasma jet morphology, electron temperature, and density were obtained, and the problem of the difficulty in analyzing the self-erosion spectrum was solved. Finally, a heat load measurement system based on a thin film calorimeter was established to measure the thermal load directly and effectively, which had the advantages of high precision and fast response speed. The research results show that under the condition of negative charging voltage of -(1~2)kV and dry air of 50 Pa, the transient thermal load power can reach the magnitude of GW•m^-2, the effective uniform area is more than 5cm^-2, and the electron density 1.78×10²³ m^-3, which meets the core index requirements of ELM high thermal load.