Theoretical Model of ITER High Resolution H-alpha Spectroscopy for a Strong Divertor Stray Light and Validation Against JET-ILW Experiments.

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Theoretical Model of ITER High Resolution H-alpha Spectroscopy for a Strong Divertor Stray Light and Validation Against JET-ILW Experiments A multi-parametric inverse problem with allowance for (i) a strong divertor stray light (DSL) on the main-chamber lines-of-sight (LoS), (ii) substantial deviation of neutral atom velocity distribution function from a Maxwellian in the SOL (a model for line shape asymmetry), (iii) data for direct observation of divertor. JPN 85844: Ip=2 MA, Bt=2.8 T, Ne0=5.8 10(19) m(-3), Te0=2.6 keV, Paux(NBI)=7.5 MW, Paux(ICRH)=2 MW 2.0 1.5 1.0 0.5 1.0 0.8 0.6 0.4 0.2 Direct observation of the divertor from top Observation of main-chamber inner wall along tangential and radial LoS (KSRB Track 11) from equatorial ports Analysis of HRS data on resolving the power at D+H Balmer- spectral lines Counts/(s pixel), 10(5) DSL/Total=0.25 OuterSOL/Total=0.40 H/(H+D)=0.038 aa inner SOL Exp. total divertor Fit Temperatures of atomic fractions (their fraction in total intensity) Non-Maxw. fractions within warm and hot Maxwellians outer SOL 1.0 eV (20%) 6.4 eV (6%) non-Maxw: 6% 276.6 eV (9%) 0.1 eV (3%) 1.5 eV (30%) non-Maxw: 6% 24.9 eV (7%) non-Maxw: 7% inner SOL outer SOL DSL DSL The results support the expectation of a strong impact of the DSL upon H-alpha (and Visible Light) Spectroscopy Diagnostic in ITER. , nm 655.9 656.1 656.3 656.5 Time, s 5 10 15 20 Fitting of measured spectrum, time 10.05 s. Asymmetry of Balmer- spectral line shapes for inner- and outer-wall SOL is due to non-Maxwellians (and small admixture of H). Fractions of inner-wall SOL, outer-wall SOL, and DSL, in total signal vs. time. Normalized total power of H+D Balmer- emission in divertor. A.B.Kukushkin, V.S.Neverov, M.F.Stamp, A.G.Alekseev, S.Brezinsek, A.V.Gorshkov, M.vonHellermann, M.B.Kadomtsev, V.Kotov, A.S.Kukushkin, M.G.Levashova, S.W.Lisgo, V.S.Lisitsa, V.A.Shurygin, E.Veshchev, D.K.Vukolov, K.Yu.Vukolov, and JET Contributors A.B. Kukushkin 1 (1) 25th IAEA-FEC 2014, St. Petersburg, Russia, EX/P5-20 16/10/2014