Optimization of Cs deposition in the 1/3 scale hydrogen negative ion source for the large helical device-neutral beam injection system.

Presents the compact cesium (Cs) coating system which was used for the direct deposition of Cs atoms and ions onto the inner surface of a third scale hydrogen negative ion source for the large helical device-neutral beam injection system. Beam current evolution after Cs depositions; Effect of temperature on hydrogen current.