An unmovable limiter without water cooling structure is designed for the HH70 device. The main components are the graphite tile assembly and the base. The graphite tile assembly is mounted on the base through the inner hexagon bolt and butterfly gasket. The transient heat transfer analysis and thermal stress analysis of HH70 unmovable limiter are carried out based on COMSOL multi-physics simulation software. The simulation results show that under the working conditions of the loading heat load of the unmovable limiter being 1 MW·m^‒2, 1.5 MW·m^‒2 and 2 MW·m^‒2, and its sustainable time being 19 seconds, 12 seconds and 9 seconds respectively the stress and temperature of the component materials are within the allowable range, which proves that the designed unmovable limiter meets the requirements of HH70 short pulse operation. Moreover, it provides a beneficial reference for the design of other high heat load components of the device.

为HH70装置设计了一种无水冷结构的固定限制器，主要部件是石墨瓦组件和底座，石墨瓦组件通过内六角螺栓和蝶形垫片安装到底座上。基于COMSOL多物理仿真软件对HH70固定限制器进行瞬态传热分析和热应力分析。计算结果表明，在固定限制器的热负荷为1 MW·m^‒2、1.5 MW·m^‒2和2 MW·m^‒2，加载时间分别为19 s、12 s和9 s的工况下，其各部件材料的温度和应力均在允许范围内。这证明所设计的固定限制器的结构满足HH70装置短脉冲运行的需求，而且为装置其他高热负荷部件的设计提供了有益的参考。