München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.113: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

Feasibility Study of 14 MeV Neutron Detection During Deuterium Experiments of Wendelstein W7-X — •Jan Paul Koschinsky1, Christoph Biedermann1, Simppa Äkäslompolo1, Sergey A. Bozhenkov1, Wolfgang Schneider1, Mitsutaka Isobe2, Takeo Nishitani2, Kunihiro Ogawa2, G. A. Wurden3, Robert C. Wolf1, and the W7-X Team11Max-Planck-Institut für Plasmaphysik, Wendelsteinstraße 1, D-17491, Greifswald, Germany — 2NIFS, JP — 3LANL, US

A future objective of Wendelstein W7-X is the study of fast ion confinement in high performance deuterium plasmas of stellarators. In these plasmas 2.5 MeV neutrons and 1 MeV tritons are generated in the two equiprobable deuteron fusion channels. A significant amount of these tritons may fuse again, if the fast tritons are confined until they slowed down into the regime of highest fusion cross-section. In this secondary fusion process, called triton burn-up, 14 MeV neutrons are generated.
Fast ion confinement can be studied by detecting these higher energetic neutrons separately with a scintillating fiber detector.
An one-dimensional simulation is presented, which estimates the rate of both 2.5 MeV and 14 MeV neutrons generated in thermal W7-X plasmas neglecting diffusion and prompt triton losses. A comparison with the neutron rates of beam-plasma interactions during neutral beam heating, calculated by the FBURN code (K. Ogawa et al PPCF 60 (2018) 095010), is given. It will be concluded, whether an existing scintillating fiber neutron detector, SciFi, is suitable for triton burn-up studies in thermal plasmas and beam-heated plasmas at W7-X.

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