Thermal modeling of the multiple shattered pellet injection system for HL-3

Abstract

In order to study the physical mechanism and control strategy of disruption mitigation, and to alleviate the destructive effects during disruption, a multiple shattered pellet injection system (multi-SPI) was designed for the HL-3 tokamak. This paper describes the preliminary engineering design of the multi-SPI, and the thermal analysis results of the pellet preparation system. In-situ condensation and propellant acceleration technologies are adopted for the multi-SPI. Three pellets can be prepared at one time and injected individually or simultaneously, one of which is 7 mm and the other two are 5.5 mm in diameter. As the key component of multi-SPI, thermal analysis of the pellet preparation system is given by ANSYS. Results show that the temperature distribution of the heat sink is relatively uniform, and the temperature of standby guns remains lower than the working gas triple point when the other guns were fired. The results verify that the structure design of the pellet preparation system can satisfy the design requirements.