title: Numerical analysis of surface produced H- ions by using two-dimensional particle-in-cell method.
abstract: The modeling and analysis of a negative ion source is proceeding by using a 2D particle-in-cell simulation. The effect of the H(-) ion production on the plasma grid (PG) surface is investigated. It is shown that with the increase of H(-) ions per time step, the H(-) ion current density is enhanced, while the electron current density decreases with increasing the H(-) production rate on the PG surface. These results agree well with the experimental results observed in typical negative ion sources. Moreover, it is found that plasma quasi-neutrality is held mainly by both H(+) and H(-) ions in the bulk plasma around the PG.
authors.affiliation: Naruto University of Education, 748 Nakashima, Takashima, Naruto-cho, Naruto-shi, Tokushima 772-8502, Japan. kmiyamot@naruto-u.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Miyamoto
authors.forename: S
authors.initials: S
authors.lastname: Okuda
authors.forename: A
authors.initials: A
authors.lastname: Hatayama
authors.forename: M
authors.initials: M
authors.lastname: Hanada