Spectroscopic characterisation of the PSI-2 plasma in the ionising and recombining state
Spectroscopic characterisation of the PSI-2 plasma in the ionising and recombining state
In the linear plasma simulator PSI-2, capable of producing electron temperatures and densities of 1–20 eV and 1017–1019 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...
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Personal Name(s): | Pospieszczyk, A. (Corresponding author) |
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Reinhart, M. / Unterberg, B. / Brezinsek, S. / Kreter, A. / Samm, U. / Sergienko, G. / Schweer, B. / Salmagne, C. / Reiter, D. / Baelmans, M. / Wünderlich, D. / Fantz, U. | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Published in: | Journal of nuclear materials, 438 (2013) S. S1249 - S1252 |
Imprint: |
Amsterdam [u.a.]
Elsevier Science
2013
|
DOI: |
10.1016/j.jnucmat.2013.01.277 |
Document Type: |
Journal Article |
Research Program: |
Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) Plasma-Wall-Interaction |
Publikationsportal JuSER |
In the linear plasma simulator PSI-2, capable of producing electron temperatures and densities of 1–20 eV and 1017–1019 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 Te and ne – profiles via the analysis of the Paschen-series resulting in drops down to 0.1 eV and 2 × 1018 m−3 in the recombining region whereas intensity ratios of Hα, Hβ and Hγ provided ne in the ionising part. In the latter case ne was also deduced from the rotational temperature of the D2 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. |