Ray tracing simulation for radiation trapping of the He I resonance transitions in a linear plasma device

Kajita, Shin; Nishijima, Daisuke; Hollmann, Eric M.; Ohno, Noriyasu
June 2009
Physics of Plasmas;Jun2009, Vol. 16 Issue 6, p063303
Academic Journal
A ray tracing code combined with a He I collisional-radiative (CR) model has been developed to investigate effects of radiation trapping on the population distribution of He atoms in a weakly ionized plasma. The code accurately reproduces experimentally observed vertical profiles of emission intensities in a linear plasma device. On the other hand, the CR code and that modified with the optical escape factor method to include the radiation trapping effects show that vertical profiles significantly deviate from measured ones at the periphery of the plasma column. This work therefore demonstrates that accurate matching of line intensity profiles over the entire plasma column requires a ray tracing code, not just an optical escape factor approximation.


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