Drift distance survey in direct plasma injection scheme for high current beam production.
Drift distance survey in direct plasma injection scheme for high current beam production.
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DOI：
10.1063/1.3298845
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发表时间：
2010-02
期刊：
影响因子：
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通讯作者：
T. Kanesue;M. Okamura;K. Kondo;J. Tamura;H. Kashiwagi;Z. Zhang
中科院分区：
文献类型：
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作者：
T. Kanesue;M. Okamura;K. Kondo;J. Tamura;H. Kashiwagi;Z. Zhang
在激光离子源中，等离子体漂移距离是最重要的设计参数之一。离子电流密度和光束脉冲宽度由激光目标和光束提取位置之间的等离子体漂移距离确定。在使用激光离子源和射频四极直线加速器的直接等离子体注入方案中，由于正偏压电极的独特形状，我们可以在光束提取时施加相对较高的电场。然而，当我们的目标是非常高的电流加速度，如几十毫安，我们观察到不匹配的光束提取条件。通过改变等离子体漂移距离，在离子萃取区测试了三种不同的离子电流，以研究更好的萃取条件。本实验对C（6+）束流进行了加速。通过控制等离子体漂移距离可以改善匹配条件。
In a laser ion source, plasma drift distance is one of the most important design parameters. Ion current density and beam pulse width are defined by plasma drift distance between a laser target and beam extraction position. In direct plasma injection scheme, which uses a laser ion source and a radio frequency quadrupole linac, we can apply relatively higher electric field at beam extraction due to the unique shape of a positively biased electrode. However, when we aim at very high current acceleration such as several tens of milliamperes, we observed mismatched beam extraction conditions. We tested three different ion current at ion extraction region by changing plasma drift distance to study better extraction condition. In this experiment, C(6+) beam was accelerated. We confirmed that matching condition can be improved by controlling plasma drift distance.