氢化钛镍合金阴极真空弧放电离子特性研究

Study of Ion Characteristic of Vacuum Arc Ion Source with Titanium-nickel Alloy Hydride Cathode

本文将氢化钛镍合金材料应用于强流长脉冲(200 A/270μs)真空弧放电实验中,该材料能在强流长脉冲真空弧放电产生的高温条件下保持较好的稳定性。使用飞行时间谱仪获得了氢化钛镍合金阴极真空弧放电产生的离子电荷态分布和离子成分。结果表明:Tin+和Nin+电荷态为1+、2+和3+,在放电过程的早期(0~30μs),H+成分随时间逐渐增加,在30μs时达到最大比例57%,而Tin+和Nin+(n=1,2,3)离子成分随时间逐渐减少,在30μs时达到最小比例43%;在放电过程的后期(30~270μs),H+成分迅速下降且在75μs后保持在总离子流的12%左右直至放电结束,Tin+和Nin+(n=1,2,3)含量随时间逐步增加,且在75μs后保持在总离子流的88%左右直至放电结束。

The titanium-nickel alloy hydride was applied to high-current long pulse(200 A/270μs)vacuum arc discharging in this paper,which is more resistant to fragmentation and maintains good stability under high temperature condition generated by high-current long pulse vacuum arc discharging.In addition,an experimental study of the ion charge state distribution and mass-charge component of vacuum arc discharging with titanium-nickel alloy hydride cathode by the time-of-flight method was carried out for the first time.The results show that titanium ion and nickel ion have charge states of 1+,2+,and 3+.Meanwhile,in the early stage of the discharging process(0-30μs),the composition of H+gradually increases with time,and reaches a maximum ratio of 57%at 30μs,while the compositions of Tin+and Nin+(n=1,2,3)rapidly decrease with time,and reach a minimum ratio of 43%at 30μs;in the later stage of the discharging process(30-270μs),the composition of H+begins to decrease rapidly and remains unchanged at around 12%after 75μs until the end of the pulse,and the compositions of Tin+and Nin+(n=1,2,3)gradually increase with time and remain around 88%after 75μs until the end of the pulse.