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Miyamoto K, Nishioka S, Goto I, et al. Analysis of the beam halo in negative ion sources by using 3D3V PIC code. Rev Sci Instrum. 2016;87(2):02B124doi: 10.1063/1.4932390.
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. The Review of scientific instruments, 87(2), 02B124. https://doi.org/10.1063/1.4932390
Miyamoto, K, et al. "Analysis of the beam halo in negative ion sources by using 3D3V PIC code." The Review of scientific instruments vol. 87,2 (2016): 02B124. doi: https://doi.org/10.1063/1.4932390
Miyamoto K, Nishioka S, Goto I, Hatayama A, Hanada M, Kojima A, Hiratsuka J. Analysis of the beam halo in negative ion sources by using 3D3V PIC code. Rev Sci Instrum. 2016 Feb;87(2):02B124. doi: 10.1063/1.4932390. PMID: 26932006.
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Rev Sci Instrum. 2016 Feb;87(2):02B124. doi: 10.1063/1.4932390.

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

The Review of scientific instruments

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

Affiliations

  1. Naruto University of Education, 748 Nakashima, Takashima, Naruto-cho, Naruto-shi, Tokushima 772-8502, Japan.
  2. Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
  3. Japan Atomic Energy Agency, 801-1 Mukouyama, Naka 319-0913, Japan.

PMID: 26932006 DOI: 10.1063/1.4932390

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.

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