Analysis of the beam halo in negative ion sources by using 3D3V PIC code

K. Miyamoto, S. Nishioka, I. Goto, A. Hatayama, M. Hanada, A. Kojima, J. Hiratsuka

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7 Citations (Scopus)

Abstract

The physical mechanism of the formation of the negative ion beam halo and the heat loads of the multi-stage acceleration grids are investigated with the 3D PIC (particle in cell) simulation. The following physical mechanism of the beam halo formation is verified: The beam core and the halo consist of the negative ions extracted from the center and the periphery of the meniscus, respectively. This difference of negative ion extraction location results in a geometrical aberration. Furthermore, it is shown that the heat loads on the first acceleration grid and the second acceleration grid are quantitatively improved compared with those for the 2D PIC simulation result.

Original languageEnglish
Article number02B124
JournalReview of Scientific Instruments
Volume87
Issue number2
DOIs
Publication statusPublished - 2016 Feb 1

ASJC Scopus subject areas

  • Instrumentation

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    Miyamoto, K., Nishioka, S., Goto, I., Hatayama, A., Hanada, M., Kojima, A., & Hiratsuka, J. (2016). Analysis of the beam halo in negative ion sources by using 3D3V PIC code. Review of Scientific Instruments, 87(2), [02B124]. https://doi.org/10.1063/1.4932390