Lithium (Li) is a promising low-Z material for particle recycling and impurity control to improve plasma performance in fusion devices. In the experimental advanced superconducting tokamak (EAST), Li coating has become a routine method for wall conditioning, and a flowing liquid Li (FLiLi) limiter has been successfully tested several times. Deuterium retention characteristics in the Li film coated on the international thermonuclear experimental reactor-like tungsten divertor and FLiLi during plasma discharges, which is important for the utilization of Li in future fusion devices, were investigated in EAST. It is found that the absorption of the fuel particles by Li coatings decreases gradually, and recycling gradually increases over a series of discharges. The maximum net amount of deuterium retained reached ∼0.8 g, corresponding to 12% deuterium in the Li. This corresponds to a whole day’s worth of shots with a total of 87 plasma discharges and a total of ∼640s plasma time after 11.75 g Li was deposited. Compared to the Li coating, it is shown that FLiLi continuously traps fuel particles and achieves a higher deuterium retention ratio over both the short- and long-term, leading to lower recycling. Meanwhile, it is also observed that the fuel particle retention ratio increases when FLiLi is closer to the plasma. This result is likely due to higher plasma heating power and limiter temperature, which cause an increased Li efflux from FLiLi due to a higher limiter temperature, which then redeposits on the other plasma-facing surfaces and increases fuel particle absorption. It is estimated that ⩾80% of the retained D particles are captured by the continual renewal of the Li redeposition film during the FLiLi operation. This investigation would also be useful for D/T retention in future fusion devices if Li is used as a plasma-facing component.

锂（Li）是一种有前途的低Z材料，可用于颗粒回收和杂质控制，以改善聚变设备中的等离子体性能。在实验性的先进超导托卡马克（EAST）中，Li涂层已成为墙面调节的常规方法，流动性Li（FLiLi）限流剂已成功进行了多次测试。在EAST中研究了国际热核实验堆状钨分流器和FLiLi等离子放电过程中涂在Li膜中的氘保留特性，这对于将来在熔融装置中利用Li至关重要。已经发现，Li涂层对燃料颗粒的吸收逐渐降低，并且在一系列放电中循环利用逐渐增加。保留的最大氘净量达到约0.8 g，对应于Li中12％的氘 这相当于一整天的拍摄时间，总共放电了87次，放电了11.75 g锂后，放电时间总计约为640s。与Li涂层相比，FLiLi可以连续捕集燃料颗粒，并在短期和长期内实现更高的氘保留率，从而降低回收率。同时，还观察到，当FLiLi更接近等离子体时，燃料颗粒保留率增加。此结果可能是由于较高的等离子加热功率和限制器温度引起的，由于较高的限制器温度导致FLiLi的Li流出量增加，然后再沉积在其他面向等离子体的表面上，并增加了燃料颗粒的吸收。据估计，在FLiLi操作过程中，Li再沉积膜的不断更新会捕获约80％的保留D颗粒。如果将Li用作面向等离子体的组件，则该研究对于将来的融合设备中的D / T保留也将很有用。