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

Journal Article · Mon Feb 15 00:00:00 EST 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4932390· OSTI ID:22482944

Nishioka, S.; Goto, I.; Hatayama, A. ^[1]; Hanada, M.; Kojima, A.; Hiratsuka, J. ^[2]

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1. Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522 (Japan)
2. Japan Atomic Energy Agency, 801-1 Mukouyama, Naka 319-0913 (Japan)

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.

• OSTI ID: 22482944
• Journal Information: Review of Scientific Instruments, Vol. 87, Issue 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ACCELERATION
ANIONS
BEAMS
COMPARATIVE EVALUATIONS
GEOMETRICAL ABERRATIONS
GRIDS
HEATING LOAD
SIMULATION