Modeling of negative ion extraction from a magnetized plasma source: Derivation of scaling laws and description of the origins of aberrations in the ion beam
Modeling of negative ion extraction from a magnetized plasma source: Derivation of scaling laws and description of the origins of aberrations in the ion beam
复制标题
从磁化等离子体源提取负离子的建模：比例定律的推导和离子束像差起源的描述
DOI：
10.1063/1.4999707
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发表时间：
2018
影响因子：
2.2
通讯作者：
J. Boeuf
中科院分区：
文献类型：
--
作者：
G. Fubiani;L. Garrigues;J. Boeuf
我们对从高亮度大功率磁化负离子源中提取负离子进行建模。该模型是一种带有蒙特卡罗碰撞的粒子模拟（PIC）算法。负离子仅在等离子体栅极表面产生（该表面将等离子体与下游的静电加速器隔开）。这项工作的范围是推导出负离子束特性相对于提取电压（加速器第一栅极的电势）和等离子体密度的标度定律，并研究离子束像差的来源。我们表明，负离子束导流系数的给定值与提取栅极上的束流轮廓相关性良好，与模拟的等离子体密度无关。此外，提取的束流电流可根据等离子体密度的任何值进行缩放。缩放因子必须通过数值推导得出，但与在实际等离子体密度下进行粒子模拟相比，计算成本的总体节省是显著的。像差……
We model the extraction of negative ions from a high brightness high power magnetized negative ion source. The model is a Particle-In-Cell (PIC) algorithm with Monte-Carlo Collisions. The negative ions are generated only on the plasma grid surface (which separates the plasma from the electrostatic accelerator downstream). The scope of this work is to derive scaling laws for the negative ion beam properties versus the extraction voltage (potential of the first grid of the accelerator) and plasma density and investigate the origins of aberrations on the ion beam. We show that a given value of the negative ion beam perveance correlates rather well with the beam profile on the extraction grid independent of the simulated plasma density. Furthermore, the extracted beam current may be scaled to any value of the plasma density. The scaling factor must be derived numerically but the overall gain of computational cost compared to performing a PIC simulation at the real plasma density is significant. Aberrations ap...