Erlangen 2018 – scientific programme
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P: Fachverband Plasmaphysik
P 26: Magnetic Confinement II - Helmholtz Graduate School V
P 26.6: Talk
Thursday, March 8, 2018, 16:05–16:30, A 0.112
Development and evaluation of a synthetic helium beam diagnostic for Wendelstein 7-X — •Wladimir Zholobenko1, Michael Rack1, Detlev Reiter1, Motoshi Goto2, Bettina Küppers1, and Petra Börner1 — 1Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik, Partner of the Trilateral Cluster (TEC), 52425 Jülich, Germany — 2National Institute for Fusion Science, Toki 509-5292, Japan
Helium beam emission spectroscopy is an established diagnostic for the determination of temperature and density in the edge region of magnetically confined plasmas. It is also applied for the study of the divertor plasma at Wendelstein 7-X. However, its applicability in the whole possible parameter range and 3D geometry is still debated [1].
Our approach is to implement a synthetic diagnostic in the established 3D Monte Carlo transport code EMC3-EIRENE to study the propagation of the helium beam into a divertor plasma and its emission. The first step was to upgrade the He collisional-radiative model in EIRENE with the more recent one from M. Goto [2], which contains an internationally evaluated data set. Numerical investigation shows the importance of the often neglected higher excited states.
The extended diagnostic module enables simulation of HeI emission patterns in complex geometries in a few seconds computing time. Detailed evaluation of given (simplified) atomic models allows improvement of the diagnostic for the experiment and parameters of interest.
[1] M. Krychowiak et al., Plasma Phys. Control. Fusion 53, 035019 (2011)
[2] M. Goto, J. Quant. Spectrosc. Radiat. Transfer 76, 331-344 (2003)