Research on Influence of Metal-Vapor Deposition on Target Injected into a Laser Fusion Reactor

在未来的激光聚变反应堆中，液态金属将用于保护第一壁免受微爆炸成核的高能粒子的影响。反应堆将充满低压金属蒸汽，加热低温靶。从理论和实验两方面研究了金属蒸气对靶的影响，建立了金属蒸气在注入式低温靶上沉积速率的计算模型。通过对均匀性要求的比较，讨论了蒸镀金属蒸气的厚度和均匀性。讨论得出了蒸汽压力和喷射速度的设计空间。由于沉积金属层厚度的不均匀性，在注入时反应器中的蒸气压必须小于0.05托。讨论了气相流动对注入靶轨迹的影响，并研制了测量沉积速率和分布的实验装置。进行了空气中靶的预喷射实验，记录到40 m/s的喷射速度。为了模拟反应器环境，准备电炉。记录的炉的温度为110 ℃，其足以在反应器中达到所需的蒸气压。注射实验正在进行中。

In a future laser fusion reactor, liquid metal will be used to protect the first wall from energetic particles nucleated by micro-explosions. The reactor will be filled with low pressure metal vapor that heat the cryogenic target. The influence of metal vapor on target is studied theoretically and experimentally.A model to evaluate the deposition rate of metal vapor on the injected cryogenic target is nucleated. The thickness and the uniformity of the deposited metal vapor is discussed comparing requirement for the uniformity. The discussion resulted in a design space for the vapor pressure and the injection velocity. The vapor pressure in the reactor at the time of the injection must be less than 0.05 Torr due to the non-uniformity of the thickness of the deposited metal layer. Influence of the vapor flow on the trajectory of injected target is also discussed.Experimental equipment to check the deposition rate and the distribution was prepared. Preliminary experiment on injection of a target in the air was conducted and the injection velocity of 40m/s was recorded. To simulate the reactor environment, an electric furnace was prepared. The recorded temperature of the furnace was 1100C that is sufficient to achiever the required vapor pressure in the reactor. The injection experiment is now in progress.