The characteristics of the extracted ion current have a significant impact on the design and testing of ion source performance. In this paper, a 2D in space and 3D in velocity space particle in cell (2D3V PIC) method is utilized to simulate plasma motion and ion extraction characteristics under various initial plasma velocity distributions and extraction voltages in a Cartesian coordinate system. The plasma density is of the order of 10¹⁵ m⁻³–10¹⁶ m⁻³ and the extraction voltage is of the order of 100 V–1000 V. The study investigates the impact of various extraction voltages on the velocity and density distributions of electrons and positive ions, and analyzes the influence of different initial plasma velocity distributions on the extraction current. The simulation results reveal that the main reason for the variation of extraction current is the space-charge force formed by the relative aggregation of positive and negative net charges. This lays the foundation for a deeper understanding of extraction beam characteristics.

中文翻译：

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提取电压对电子和离子行为特征的影响

提取离子流的特性对离子源性能的设计和测试有重大影响。本文采用2D空间和3D速度空间粒子在细胞内（2D3V PIC）方法来模拟笛卡尔坐标系中不同初始等离子体速度分布和提取电压下的等离子体运动和离子提取特性。等离子体密度约为 10 ¹⁵ m ^-3 –10 ¹⁶ m ^-3，提取电压约为 100 V–1000 V。该研究研究了不同提取电压对等离子体速度和密度分布的影响。电子和正离子，并分析了不同初始等离子体速度分布对提取电流的影响。仿真结果表明，引出电流变化的主要原因是正负净电荷相对聚集形成的空间电荷力。这为更深入地了解提取光束特性奠定了基础。