This work is a part of the development of a laser ion source (LIS) for multiply charged ion injectors. This experiment is devoted to the investigation of the effect of a metal grid on the extracted ion characteristics. The energy spectra of the ions in the plasma expanding into a drift tube with and without a grid have been compared. Plasmas of two different target materials, carbon and tungsten, were generated by the CO2 laser pulses with the focal power density on the target of about 1011 W/cm2. The time-of-flight method with an electrostatic energy analyzer installed just behind the grid is used to measure the charge states and energy distributions of ions. A significant effect of the grid on the ion energy distributions has been observed. This effect depends strongly on the ion mass and should be taken into account when designing a LIS, especially in the case of heavy ions.

中文翻译：

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引出栅对离子束特性的影响

这项工作是开发用于多电荷离子注射器的激光离子源 (LIS) 的一部分。该实验致力于研究金属网格对提取离子特性的影响。已经比较了等离子体中离子在带有和不带有网格的情况下扩展到漂移管中的能谱。碳和钨两种不同目标材料的等离子体由 CO2 激光脉冲产生，目标上的聚焦功率密度约为 1011 W/cm2。使用安装在网格后面的静电能量分析仪的飞行时间方法来测量离子的电荷状态和能量分布。已经观察到网格对离子能量分布的显着影响。这种影响很大程度上取决于离子质量，在设计 LIS 时应予以考虑，