轫致辐射转换靶靶面回流离子对电子束聚焦的影响
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摘要: 分析了轫致辐射转换靶靶面回流离子产生的机制及其对电子束聚焦的影响，并提出了相应的解决方法。结果表明，H+和C+轻离子回流约60ns后，将对束聚焦产生严重影响；Ta+或W+的回流，就短脉冲而言，对束聚焦的影响很小，对长脉冲而言(如脉冲宽度大于200ns)，则影响很大。Abstract: This paper analyses the mechanism which backstreaming ions are produced and the effect of backstreaming ions on focus of electron beams. The methods which control the effect of backstreaming ions are also given. The results show that if backstreaming ions are H+ or C+, they seriously affect the focus of electronic beams after H+ or C+ backstreams 60ns; if backstreaming ions are Ta+ or W+, they do almost not affect the focus of electronic beams when the beam pulse is short, but seriously destroy the effect of the beam focus when the beam pulse > 200ns.
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Key words:
- bremsstrahlung target /
- backstreaming ions /
- focus
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