摘要
To match the large power long pulse neutral beam injectors for HL-2A Tokarnak,a circular magnetic multipole line-cusp ion source(namely a bucket ion source)has been designed.The arc chamber of this ion source is a water-cooled,stainless-steel cylinder 26cm in diameter,4mm thick,and 24cm long.So far,many arc discharge experiments on this ion source have demonstrated that the plasma density has been 0.24A/cm^2,for 3 seconds duration, within 5%—7% plasma uniformity,and 3 seconds maximum pulse.Arc discharge characteristics,such as the gas pressure dependence and filaments arrangements dependence have been studied experimentally and theoretically in this paper.
为了在HL-2A上实现3MW的中性束注入,我院自主研制了直径为260mm,高度为240mm的大功率多磁极会切场离子源.目前,它的性能已达到并超过了最初设计指标,放电脉冲为1s时,最大离子流密度为0.44A/cm^2;放电脉冲为3s时,等离子体离子流密度0.24A/cm^2;等离子体非均匀性都在5%—7%范围之内.目前,它是我国国内等离子体密度最高,放电功率最大的长脉冲桶式离子源.本文通过实验数据与理论相结合的方式对弧放电特性进行分析.
