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Lopez-Cansino, R; Perseo, V; Viezzer, E; Kriete, D M; Ford, O P; Romba, T; Poloskei, P Zs
Plasma physics and controlled fusion, 04/2024, Volume: 66, Issue: 4Journal Article
Abstract In this work, the Coherence Imaging Spectroscopy technique is exploited for active charge exchange radiation measurements to infer high spatial resolution 2D ion temperature ( T i ) maps in the core region of Wendelstein 7-X plasmas. A synthetic model of the diagnostic is developed and used for the optimization of the hardware components for the expected ion temperatures ( T i ∼ 2 keV) prioritizing T i measurements while also considering the ion velocity flow resolution. The experimental set-up is shown and the diagnostic calibration procedure for T i measurements is introduced. A combination of both simulations and experimental calibrations enable high fidelity system group delay ( ∂ ϕ ∂ λ ) characterization in the whole visible spectral range. Finally, the signal processing techniques applied to the diagnostic signal are introduced and first measurements of 2D T i maps are presented and validated against standard Charge eXchange Recombination Spectroscopy T i profiles, finding excellent agreement.
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