- Conference date: 3–7 September 2012
- Location: Jyväskylä, Finland
VUV-diagnostics results of a filament-driven multi-cusp arc discharge H− ion source (LIISA) are reported. It has been found that 15 - 30 % of the discharge power is dissipated via light emission in measured VUV-range (120-250 nm). The radiance measurements at different wavelengths are used for estimating reaction rates. The volumetric rate of vibrational heating of hydrogen molecules and the lower limit for volumetric rate of ionization are 6.6 ⋅ 1016 s−1 cm−3 per kW of discharge power. The corresponding density of hot electron population is 5.9 ⋅ 1010 cm−3/kW. The correlation between the VUV-emission and H− production is studied. It is concluded that the distribution of high vibrational states contributing to the volume production of H− is is not strongly affected by ion source parameters.
Data & Media loading...
Article metrics loading...