TY - GEN
T1 - Effects of the extraction voltage applied by the puller-electrode on the H- Extraction in the Linac4 negative ion source
AU - Abe, S.
AU - Nishioka, S.
AU - Mattei, S.
AU - Hatayama, A.
AU - Lettry, J.
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017/8/9
Y1 - 2017/8/9
N2 - In order to understand the H- extraction mechanism and investigate the effect of the extraction voltage applied by the puller-electrode on the H- extraction in the Linac4 negative ion source, we are developing a 2D3V-PIC (two dimensions in the real space and three dimensions in the velocity space, Particle in Cell) model with volume produced H- ions. It is shown that how to take the magnetic filter field direction is important for the 2D modeling to take into account the important 3D effect of electron ExB drift. It is also shown that the meniscus formation is not symmetric due to the electron ExB drift in the extraction region and the divergence of the H- beam is asymmetric. In order to make more quantitative comparison of the extracted H- and electron currents with the experiments and 3D modeling, further improvements, especially the electron loss along the magnetic filter field line will be needed.
AB - In order to understand the H- extraction mechanism and investigate the effect of the extraction voltage applied by the puller-electrode on the H- extraction in the Linac4 negative ion source, we are developing a 2D3V-PIC (two dimensions in the real space and three dimensions in the velocity space, Particle in Cell) model with volume produced H- ions. It is shown that how to take the magnetic filter field direction is important for the 2D modeling to take into account the important 3D effect of electron ExB drift. It is also shown that the meniscus formation is not symmetric due to the electron ExB drift in the extraction region and the divergence of the H- beam is asymmetric. In order to make more quantitative comparison of the extracted H- and electron currents with the experiments and 3D modeling, further improvements, especially the electron loss along the magnetic filter field line will be needed.
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U2 - 10.1063/1.4995771
DO - 10.1063/1.4995771
M3 - Conference contribution
AN - SCOPUS:85030101468
T3 - AIP Conference Proceedings
BT - 5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016
A2 - Faircloth, Dan
PB - American Institute of Physics Inc.
T2 - 5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016
Y2 - 12 September 2016 through 16 September 2016
ER -