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000904064 1001_ $$00000-0001-6617-8459$$aPablant, N. A.$$b0
000904064 245__ $$aCorrection and verification of x-ray imaging crystal spectrometer analysis on Wendelstein 7-X through x-ray ray tracing
000904064 260__ $$a[S.l.]$$bAmerican Institute of Physics$$c2021
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000904064 520__ $$aX-ray ray tracing is used to develop ion-temperature corrections for the analysis of the X-ray Imaging Crystal Spectrometer (XICS) used at Wendelstein 7-X (W7-X) and perform verification on the analysis methods. The XICS is a powerful diagnostic able to measure ion-temperature, electron-temperature, plasma flow, and impurity charge state densities. While these systems are relatively simple in design, accurate characterization of the instrumental response and validation of analysis techniques are difficult to perform experimentally due to the requirement of extended x-ray sources. For this reason, a ray tracing model has been developed that allows characterization of the spectrometer and verification of the analysis methods while fully considering the real geometry of the XICS system and W7-X plasma. Through the use of ray tracing, several important corrections have been found that must be accounted for in order to accurately reconstruct the ion-temperature profiles. The sources of these corrections are described along with their effect on the analyzed profiles. The implemented corrections stem from three effects: (1) effect of sub-pixel intensity distribution during de-curving and spatial binning, (2) effect of sub-pixel intensity distribution during forward model evaluation and generation of residuals, and (3) effect of defocus and spherical aberrations on the instrumental response. Possible improvements to the forward model and analysis procedures are explored, along with a discussion of trade-offs in terms of computational complexity. Finally, the accuracy of the tomographic inversion technique in stellarator geometry is investigated, providing for the first time a verification exercise for inversion accuracy in stellarator geometry and a complete XICS analysis tool-chain.
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000904064 7001_ $$0P:(DE-Juel1)180388$$aLangenberg, A.$$b1$$ufzj
000904064 7001_ $$0P:(DE-Juel1)190845$$aAlonso, J. A.$$b2$$ufzj
000904064 7001_ $$0P:(DE-HGF)0$$aBitter, M.$$b3
000904064 7001_ $$00000-0003-4289-3532$$aBozhenkov, S. A.$$b4
000904064 7001_ $$0P:(DE-Juel1)174060$$aFord, O. P.$$b5
000904064 7001_ $$00000-0002-2494-8125$$aHill, K. W.$$b6
000904064 7001_ $$0P:(DE-HGF)0$$aKring, J.$$b7
000904064 7001_ $$0P:(DE-Juel1)5739$$aMarchuck, O.$$b8$$eCorresponding author
000904064 7001_ $$0P:(DE-HGF)0$$aSvensson, J.$$b9
000904064 7001_ $$0P:(DE-HGF)0$$aTraverso, P.$$b10
000904064 7001_ $$0P:(DE-HGF)0$$aWindisch, T.$$b11
000904064 7001_ $$0P:(DE-HGF)0$$aYakusevitch, Y.$$b12
000904064 773__ $$0PERI:(DE-600)1472905-2$$a10.1063/5.0043513$$gVol. 92, no. 4, p. 043530 -$$n4$$p043530 -$$tReview of scientific instruments$$v92$$x0034-6748$$y2021
000904064 8564_ $$uhttps://juser.fz-juelich.de/record/904064/files/5.0043513.pdf$$yPublished on 2021-04-09. Available in OpenAccess from 2022-04-09.
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