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Influence of the electron cross-field diffusion in negative ion sources with the transverse magnetic field and the plasma-electrode bias

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4 Author(s)
Kuppel, S. ; Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan ; Matsushita, D. ; Hatayama, A. ; Bacal, M.

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The physical mechanisms involved in the extraction of H- ions from the negative ion source are studied with a PIC 2D3V code. The effect of a weak magnetic field transverse to the extraction direction is taken into account, along with a variable bias voltage applied on the plasma electrode (PE). In addition to previous modeling works, the electron diffusion across the magnetic field is taken into account as a simple one-dimensional random-walk process. The results show that without PE bias, the value of the diffusion coefficient has a significant influence upon the value of the extracted H- current. However, the value of this coefficient does not affect qualitatively the mechanism leading to the peak of extracted H- ion current observed for an optimum value of the PE bias.

Published in:

Review of Scientific Instruments  (Volume:81 ,  Issue: 2 )

Date of Publication:

Feb 2010

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