Spectroscopic characterisation of the PSI-2 plasma in the ionising and recombining state

[摘要] In the linear plasma simulator PSI-2, capable of producing electron temperatures and densities of 1-20 eV and 10(17)-10(19) m(-3) in the target region, a deuterium plasma with a simultaneous ionising and recombining region has been produced. The latter appeared when a sufficiently high extra deuterium gas flow was applied at the target region. An imaging spectrometer was used to measure T-e and n(e) - profiles via the analysis of the Paschen-series resulting in drops down to 0.1 eV and 2 x 10(18) m(-3) in the recombining region whereas intensity ratios of H alpha, H beta and H gamma provided ne in the ionising part. In the latter case ne was also deduced from the rotational temperature of the D-2 molecules. Comparison with probe data yielded a reasonable agreement in that case. A detailed analysis of the atomic level populations and their light emissions provided some insight into the contribution of possible recombination mechanisms such as EIR and MAR. (C) 2013 Elsevier B. V. All rights reserved.

[发布日期] 2013-07-01

[效力级别]  Proceedings Paper