Synthetic Phase Contrast Imaging at the Wendelstein 7-X Stellarator

ORAL

Abstract

As the largest neoclassically optimized stellarator, Wendelstein 7-X (W7-X) plays a crucial role in stellarator turbulence studies. The main core turbulence diagnostic at W7-X is the phase contrast imaging (PCI) system, which measures the line-integrated fluctuating electron density along a central line-of-sight. The line-integrated nature of the PCI measurements complicates the interpretation of experimental data. It is thus advantageous to utilize synthetic PCI diagnostics, capable of computing the expected PCI signal based on model electron density fluctuations. This contribution describes results obtained with such a synthetic diagnostic at W7-X, including input from the first nonlinear, global gyrokinetic simulations of stellarators with kinetic electrons.

*SKH was supported by an Internationalisation Fellowship (CF19-0738) from the Carlsberg Foundation. Support for the MIT and SUNY-Cortland participation was provided by the US Department of Energy, Grant DE-SC0014229. This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014−2018 and 2019−2020 under grant agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

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Publication: J.-P. Bähner, J.A. Alcusón, S.K. Hansen, A. von Stechow, O. Grulke, T. Windisch, H.M. Smith, Z. Huang, E.M. Edlund, M. Porkolab, M.N.A. Beurskens, S.A. Bozhenkov, O.P. Ford, L. Vanó, A. Langenberg, N. Pablant, G.G. Plunk, A. Bañón Navarro, F. Jenko, and The W7-X Team. Phase contrast imaging measurements and numerical simulations of turbulent density fluctuations in gas-fuelled ECRH discharges in Wendelstein 7-X. Journal of Plasma Physics Vol. 87, 905870314 (2021). DOI: 10.1017/S0022377821000635

S.K. Hansen, M. Porkolab, Z. Huang, J.-P. Bähner, A. von Stechow, O. Grulke, E.M. Edlund, A. Bañón Navarro, E. Sánchez, and the Wendelstein 7-X Team. Synthetic Phase Contrast Imaging Diagnostic for Wendelstein 7-X. Proceedings of the 47th EPS Conference on Plasma Physics (Virtual), P3.1078 (2021). URL: http://ocs.ciemat.es/EPS2021PAP/pdf/P3.1078.pdf

S.K. Hansen, M. Porkolab, Z. Huang, J.-P. Bähner, A. von Stechow, O. Grulke, E.M. Edlund, A. Bañón Navarro, F. Wilms, F. Jenko, E. Sánchez, and the Wendelstein 7-X team. Development of a Synthetic Phase Contrast Imaging Diagnostic for Wendelstein 7-X (journal paper in preparation)

Presenters

  • Søren Kjer K Hansen

    • Massechusetts Institute of Technology
    • Massachusetts Institute of Technology MIT

Authors

  • Søren Kjer K Hansen

    • Massechusetts Institute of Technology
    • Massachusetts Institute of Technology MIT

  • Miklos Porkolab

    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology (MIT)
    • Massachusetts Institute of Technology MIT

  • Zhouji Huang

    • Massachusetts Institute of Technology MIT

  • Eric M Edlund

    • SUNY Cortland

  • Jan-Peter Bähner

    • Max Planck Institute for Plasma Physics

  • Adrian von Stechow

    • Max Planck Institute for Plasma Physics

  • Olaf Grulke

    • Max Planck Institute for Plasma Physics and Technical University of Denmark, Kongens Lyngby, Denmark
    • Max Planck Institute for Plasma Physics

  • Felix Wilms

    • Max Planck Institute for Plasma Physics

  • Alejandro Bañón Navarro

    • Max Planck Institute for Plasma Physics

  • Edi Sánchez

    • CIEMAT

  • Javier H Nicolau

    • University of California, Irvine