《Table 1.The cooling water flow rate of each component of RF plasma source with RF power of 35 kW.》下

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《Achievement of 1000 s plasma generation of RF source for neutral beam injector》

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The RF plasma source achieved long pulse of 1000 s plasma discharge with RF power of 35 kW on the RF source test bed for the first time.It lays the foundation of development of high power ion source with quasi-steady-state or steady-state operation.According to the experimental results，the side wall of FS was the component with highest heat load.Considering that the plasma in the driver will sputter the ceramic insulator，the FS is mainly used to protect the ceramic insulator，so，the FS cannot be removed even it has high heat deposition.The water cooling was optimized with more cooling pipes to increase the water flow rate for enhancing the heat remove efficiency.Furthermore，the source pressure is higher than the requirement of 0.3 Pa for the negative ion source.In the future，low pressure plasma discharge will be tested more.