Correction and verification of x-ray imaging crystal spectrometer analysis on Wendelstein 7-X through x-ray ray tracing

Pablant, N. A.; Langenberg, A.; Alonso, J. A.; Bitter, M.; Bozhenkov, S. A.; Ford, O. P.; Hill, K. W.; Kring, J.; Marchuck, O.; Svensson, J.; Traverso, P.; Windisch, T.; Yakusevitch, Y.

doi:10.1063/5.0043513

Title: Correction and verification of x-ray imaging crystal spectrometer analysis on Wendelstein 7-X through x-ray ray tracing

Journal Article · Fri Apr 09 00:00:00 EDT 2021 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0043513· OSTI ID:1804648

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^[3]; Bitter, M. ^[1];

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^[1]; Kring, J. ^[4];

^[5]; Svensson, J. ^[2]; Traverso, P. ^[4]; Windisch, T. ^[2]; Yakusevitch, Y. ^[6]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Max-Planck-Institut für Plasmaphysik, Greifswald (Germany)
Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain). Laboratorio Nacional de Fusión
Auburn Univ., AL (United States)
Forschungszentrum Jülich (Germany). Institut für Energie und Klimaforschung, Plasmaphysik
Univ. of California, Santa Barbara, CA (United States)

X-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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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE; European Commission (EC)

Grant/Contract Number:: AC02-09CH11466; 633053

OSTI ID:: 1804648

Alternate ID(s):: OSTI ID: 1775177

Journal Information:: Review of Scientific Instruments, Vol. 92, Issue 4; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

References (16)

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Inference of temperature and density profiles via forward modeling of an x-ray imaging crystal spectrometer within the Minerva Bayesian analysis framework Langenberg, A.; Svensson, J.; Marchuk, O. Review of Scientific Instruments, Vol. 90, Issue 6 https://doi.org/10.1063/1.5086283	journal	June 2019
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