A detailed simulation for the transmission spectrum of hot aluminium plasma

Abstract

The experimental transmission spectrum [Jiamin Yang et al., Phys. Plasmas 10, 4881 (2003)] of hot aluminium plasma is simulated by using a detailed term accounting model. The fine absorption structures are reproduced reasonably well for both the absorption strength and the line positions. The discrepancies between the detailed simulation and the experiment show that the temperature gradient exists in the experimental sample. By fitting the measured transmission spectrum with the variation of the population of the ion stage, it is concluded that the experimental transmission spectrum was obtained mainly at the temperature of about 65 eV but overlapped by some lower temperature spectra of even down to 35 eV. The relative strength of the fine absorption lines within one stage of the ion cannot be reproduced accurately without considering the non-Boltzmann distributions among the energy levels of the ion.