Plasma grid shape and size effects on the extraction of negative ions

被引：7
|
作者：
Taccogna, F. [1 ]
Minelli, P. [1 ]
Capitelli, M. [1 ]
Longo, S. [1 ]
Schneider, R. [2 ]
机构：
[1] Univ Bari, Ist Metodol Inorgan & Plasmi IMIP, CNR, Via Amendola 122-D, I-70126 Bari, Italy
[2] Ernst Moritz Arndt Univ Greifswald, Inst Phys, D-17487 Greifswald, Germany
来源：
THIRD INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2012) | 2013年 / 1515卷
关键词：
Particle-in-Cell Model; Plasma Sheath; Surface-produced negative Ion;
D O I：
10.1063/1.4792764
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
By means of a self-consistent three-dimensional particle model of the source-extraction transition region of a surface-produced negative ion source, the characteristics of negative ion transport have been revealed. It is purely electrostatic and collision-induced (charge exchange with atoms) and magnetic-induced (gyration around filter field) transport contributions play no relevant role for the H- transport. In fact, the key point is the penetration of the EG field inside the source, which helps removing negative ions produced on the surface. This study suggests that the best PG shape is characterized such to allow the extraction EG field from attaching the surface from where H- are produced and that the best aperture size is directly related to this particular shape.
引用
收藏
页码：3 / 11
页数：9
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