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

10.50 Spectroscopy accompanied by a versatile gas injection system in the divertor plasma of the experimental campaign OP1.2 at Wendelstein 7-X

18 Apr 2018, 10:30
2h 31m
Paradise Point Resort & Spa

Paradise Point Resort & Spa

1404 Vacation Rd, San Diego, CA 92109

Speakers

Maciej Krychowiak (Max-Planck-Institute for Plasma Physics) Adnan Ali (Max Planck Institute for Plasma Physics) Jürgen Baldzuhn (Max Planck Institute for Plasma Physics) Tullio Barbui (Univ. of Wisconsin, Dept. of Engineering Physics) Christoph Biedermann (Max Planck Institute for Plasma Physics) Sebastijan Brezinsek (Institute of Energy- and Climate Research, Forschungszentrum Jülich GmbH) Florian Effenberg (Univ. of Wisconsin, Dept. of Engineering Physics) Oliver Ford (Max Planck Institute for Plasma Physics) Jeffrey Harris (Oak Ridge National Laboratory) Marcin Jakubowski (Max Planck Institute for Plasma Physics) Ralf König (Max Planck Institute for Plasma Physics) Petra Kornejew (Max Planck Institute for Plasma Physics) Thierry Kremeyer (Univ. of Wisconsin, Dept. of Engineering Physics) Yunfeng Liang (Institute of Energy- and Climate Research, Forschungszentrum Jülich GmbH) Olaf Neubauer (Institute of Energy- and Climate Research, Forschungszentrum Jülich GmbH) Holger Niemann (Max Planck Institute for Plasma Physics) Thomas Sunn Pedersen (Max Planck Institute for Plasma Physics) Oliver Schmitz (Univ. of Wisconsin, Dept. of Engineering Physics) Bernd Schweer (Institute of Energy- and Climate Research, Forschungszentrum Jülich GmbH) Erhui Wang (Institute of Energy- and Climate Research, Forschungszentrum Jülich GmbH) Yanling Wei (Institute of Energy- and Climate Research, Forschungszentrum Jülich GmbH) Uwe Wenzel (Max Planck Institute for Plasma Physics) Victoria Winters (Univ. of Wisconsin, Dept. of Engineering Physics) Diahong Zhang (Max Planck Institute for Plasma Physics)

Description

For the stellarator W7-X, spectroscopic systems detecting line radiation of light impurities and hydrogen from near UV to near IR for quantitative studies at two different divertors have been prepared. These systems comprise of various spectrometers with cooled CCD cameras as well as photomultipliers with interference filters for fast measurements (up to 100 kHz). At both positions, a versatile gas injection system has been installed for a wide range of applications. Trace amounts of helium for local measurement of ne and Te profiles using the line ratio method were routinely carried out. Perturbative impurity gasses (neon and nitrogen) were injected to study e.g. active radiation cooling in the divertor region or hydrogen for fuelling and studies of detached plasmas. During first part of OP1.2 strong heat flux reduction to the divertors has been observed for some hydrogen plasma conditions suggesting a completely detached plasma state. The capability of active control the detachment plasma conditions by local gas injection was investigated experimentally. Some results are shown pointing out possible scenarios for detachment optimization by feedback controlled gas injection which is planned for the upcoming second part of OP1.2.

Primary author

Maciej Krychowiak (Max-Planck-Institute for Plasma Physics)

Co-authors

Adnan Ali (Max Planck Institute for Plasma Physics) Jürgen Baldzuhn (Max Planck Institute for Plasma Physics) Tullio Barbui (Univ. of Wisconsin, Dept. of Engineering Physics) Christoph Biedermann (Max Planck Institute for Plasma Physics) Sebastijan Brezinsek (Institute of Energy- and Climate Research, Forschungszentrum Jülich GmbH) Florian Effenberg (Univ. of Wisconsin, Dept. of Engineering Physics) Oliver Ford (Max Planck Institute for Plasma Physics) Jeffrey Harris (Oak Ridge National Laboratory) Marcin Jakubowski (Max Planck Institute for Plasma Physics) Ralf König (Max Planck Institute for Plasma Physics) Petra Kornejew (Max Planck Institute for Plasma Physics) Thierry Kremeyer (Univ. of Wisconsin, Dept. of Engineering Physics) Yunfeng Liang (Institute of Energy- and Climate Research, Forschungszentrum Jülich GmbH) Olaf Neubauer (Institute of Energy- and Climate Research, Forschungszentrum Jülich GmbH) Holger Niemann (Max Planck Institute for Plasma Physics) Thomas Sunn Pedersen (Max Planck Institute for Plasma Physics) Oliver Schmitz (Univ. of Wisconsin, Dept. of Engineering Physics) Bernd Schweer (Institute of Energy- and Climate Research, Forschungszentrum Jülich GmbH) Erhui Wang (Institute of Energy- and Climate Research, Forschungszentrum Jülich GmbH) Yanling Wei (Institute of Energy- and Climate Research, Forschungszentrum Jülich GmbH) Uwe Wenzel (Max Planck Institute for Plasma Physics) Victoria Winters (Univ. of Wisconsin, Dept. of Engineering Physics) Diahong Zhang (Max Planck Institute for Plasma Physics)

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