Control of impurities, fuel recycling and hydrogen content by lithium evaporative coatings and real-time lithium powder injection (LPI) in EAST are studied for high performance H-mode discharges of up to ∼100 s. The results show that the lithium evaporative coatings significantly reduced both the low-Z impurity carbon and high-Z impurity tungsten as well as molybdenum concentration in the plasmas, and the impurities concentration significantly reduced with the accumulated lithium coatings and maintained well afterwards. Specifically the high-Z tungsten core impurity concentration was maintained between 3 ppm–15 ppm during the 101 s H-mode discharge, which is acceptable for the long pulse operation. In addition, real-time wall conditioning via LPI successfully reduced the core high-Z metal impurities by 50% during ∼35 s long pulse H-mode discharge, exhibiting strong compatibility between real-time LPI with long pulse discharges. In addition, evaporative lithium coatings demonstra...

中文翻译：

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锂涂层对EAST中长脉冲高性能等离子体放电的影响

研究了通过EAST中的锂蒸发涂层和实时锂粉喷射（LPI）来控制杂质，燃料循环利用和氢含量的方法，以实现高达约100 s的高性能H模式放电。结果表明，锂蒸发涂层显着降低了等离子体中的低Z杂质碳和高Z杂质钨以及钼浓度，并且随着锂涂层的积累，杂质浓度显着降低，此后保持良好。特别是在101 s H模式放电期间，高Z钨芯杂质浓度保持在3 ppm-15 ppm之间，这对于长脉冲操作是可以接受的。此外，通过LPI进行的实时壁调节在约35 s的长脉冲H型放电过程中成功地将核心高Z金属杂质减少了50％，在实时LPI和长脉冲放电之间表现出强大的兼容性。此外，蒸发式锂涂层还证明了...