[6a-PA8-1~4] 7.5 Ion beams

[6a-PA8-1] Thickness of Cs layer on the plasma grid of H^- ion source operated with deuterium

〇Motoi Wada¹, Takahiro Kenmotsu², Mamiko Sasao³, Katsuyoshi Tsumori⁴ (1.Sch. Sci. Eng. Doshisha Univ., 2.L&M Sci. Doshisha Univ., 3.R&D Prmot. Doshisha Univ., 4.NIFS)

Keywords:negative ion, deuterium, plasma grid

Using the ACAT (Atomic Collision in Amorphous Targe) code, negative ionization probabilities for both hydrogen and deuterium at the cesiated plasma grid surface were computed. The ion induced desorption component showed substantial reduction as the operating gas was switched from hydrogen to deuterium. Deuterium plasma sputters out more Cs adsorbed on the plasma grid surface more than hydrogen plasma.