15-19 April 2018
Paradise Point Resort & Spa
America/Los_Angeles timezone

4.28 Wendelstein 7-X Bayesian Zeff inference in the Minerva framework

16 Apr 2018, 20:30
2h 1m
Paradise Point Resort & Spa

Paradise Point Resort & Spa

1404 Vacation Rd, San Diego, CA 92109

Speakers

Sehyun Kwak (Max-Planck-Institut für Plasmaphysik) Jakob Svensson (Max-Planck-Institut für Plasmaphysik) Andrea Pavone (Max-Planck-Institut für Plasmaphysik) Udo Höfel (Max-Planck-Institut für Plasmaphysik) Oliver Ford (Max-Planck-Institut für Plasmaphysik) Maciej Krychowiak (Max-Planck-Institut für Plasmaphysik) Lilla Vanó (Max-Planck-Institut für Plasmaphysik) Sergey Bozhenkov (Max-Planck-Institut für Plasmaphysik) Petra Kornejew (Max-Planck-Institut für Plasmaphysik) Young-chul Ghim (KAIST)

Description

Effective charge is an important physics parameter in magnetic confinement fusion research for understanding the behaviour of plasma impurities. A Bayesian model of Bremsstrahlung emission and the participating W7-X diagnostics has been developed in the Minerva framework. Since the Bremsstrahlung emission depends on electron density and temperature, the model includes Thomson scattering, interferometer, and spectroscopy diagnostics related to all relevant physics parameters. Gaussian processes have been used for tomographic inversion of the effective charge, electron density and temperature profiles. Profile hyperparameters are optimised by Bayes Occam’s razor criteria for optimal smoothness. The posterior distribution is explored by Markov chain Monte Carlo sampling, giving full uncertainties of all relevant physics quantities.

Primary author

Sehyun Kwak (Max-Planck-Institut für Plasmaphysik)

Co-authors

Jakob Svensson (Max-Planck-Institut für Plasmaphysik) Andrea Pavone (Max-Planck-Institut für Plasmaphysik) Udo Höfel (Max-Planck-Institut für Plasmaphysik) Oliver Ford (Max-Planck-Institut für Plasmaphysik) Maciej Krychowiak (Max-Planck-Institut für Plasmaphysik) Lilla Vanó (Max-Planck-Institut für Plasmaphysik) Sergey Bozhenkov (Max-Planck-Institut für Plasmaphysik) Petra Kornejew (Max-Planck-Institut für Plasmaphysik) Young-chul Ghim (KAIST)

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