RF plasma modeling of the Linac4 H− ion source
RF plasma modeling of the Linac4 H− ion source
复制标题
Linac4 H− 离子源的射频等离子体建模
DOI：
10.1063/1.4792807
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
C. Schmitzer
中科院分区：
文献类型：
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作者：
S. Mattei;M. Ohta;A. Hatayama;J. Lettry;Y. Kawamura;M. Yasumoto;C. Schmitzer
这项研究聚焦于欧洲核子研究中心（CERN）目前正在建造的直线加速器4（Linac4）H⁻离子源中感应耦合等离子体射频（ICP RF）等离子体的建模。通过粒子模拟 - 蒙特卡罗碰撞（PIC - MCC）方法，已经开发出了一个包含射频电磁场的等离子体动力学自洽模型。在本文中，该模型被应用于低密度等离子体放电起始的分析，尤其关注外部磁场对等离子体特性的影响，例如壁面损失、电子密度和电子能量。采用多尖峰磁场有效地限制了壁面损失，特别是在径向方向。然而，初步结果表明，在这种配置下加热效率会降低。这种影响可能是由于电子被多尖峰磁场捕获，阻止了它们在方位角方向的持续加速。
This study focuses on the modelling of the ICP RF-plasma in the Linac4 H− ion source currently being constructed at CERN. A self-consistent model of the plasma dynamics with the RF electromagnetic field has been developed by a PIC-MCC method. In this paper, the model is applied to the analysis of a low density plasma discharge initiation, with particular interest on the effect of the external magnetic field on the plasma properties, such as wall loss, electron density and electron energy. The employment of a multi-cusp magnetic field effectively limits the wall losses, particularly in the radial direction. Preliminary results however indicate that a reduced heating efficiency results in such a configuration. The effect is possibly due to trapping of electrons in the multi-cusp magnetic field, preventing their continuous acceleration in the azimuthal direction.