Effect of basic physical parameters to control plasma meniscus and beam halo formation in negative ion sources

K. Miyamoto, S. Okuda, S. Nishioka, A. Hatayama

研究成果: Article査読

17 被引用数 (Scopus)

抄録

Our previous study shows that the curvature of the plasma meniscus causes the beam halo in the negative ion sources: the negative ions extracted from the periphery of the meniscus are over-focused in the extractor due to the electrostatic lens effect, and consequently become the beam halo. In this article, the detail physics of the plasma meniscus and beam halo formation is investigated with two-dimensional particle-in-cell simulation. It is shown that the basic physical parameters such as the H- extraction voltage and the effective electron confinement time significantly affect the formation of the plasma meniscus and the resultant beam halo since the penetration of electric field for negative ion extraction depends on these physical parameters. Especially, the electron confinement time depends on the characteristic time of electron escape along the magnetic field as well as the characteristic time of electron diffusion across the magnetic field. The plasma meniscus penetrates deeply into the source plasma region when the effective electron confinement time is short. In this case, the curvature of the plasma meniscus becomes large, and consequently the fraction of the beam halo increases.

本文言語English
論文番号103302
ジャーナルJournal of Applied Physics
114
10
DOI
出版ステータスPublished - 2013 9 14

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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