Numerical Analysis of the Hydrogen Atom Density in a Negative Ion Source.

Production and transport processes of H0 atoms are numerically simulated to obtain the H0 atom density. A three-dimensional transport code using a Monte Carlo method has been applied to analyze the local density of H0 atoms in the large “JAEA 10 ampere negative ion source” under Cs-seeded condition. In this study, the production rate of H0 atoms through the dissociation process of H2 molecules is estimated from single probe characteristics of the Langmuir probe measurement. In the code, the energy relaxation process of H0 atoms is also taken into account. The results show that the existence of high-energy electrons and the energy relaxation process of H0 atoms affect the H0 atom density. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]