DPG Phi
Verhandlungen
Verhandlungen
DPG

Bremen 2017 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

P: Fachverband Plasmaphysik

P 15: Helmholtz Graduate School II

P 15.15: Poster

Dienstag, 14. März 2017, 16:30–18:30, HS Foyer

Cross-polarization scattering of diffracting microwave beams in ITER — •Lorenzo Guidi1,2, Omar Maj1, Hannes Weber1, Alf Köhn1, Antti Snicker1, and Emanuele Poli11Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany — 2Technische Universität München, Numerical Methods for Plasmaphysics (M16), Boltzmannstr. 3, 85748 Garching, Germany

Density fluctuations in the edge region may severely affect the quality of electron-cyclotron beams in ITER, with potentially detrimental effects on their intended applications, e.g., stabilization of MHD modes. Density fluctuations may lead in particular to: i) a broadening of the beam, with consequent loss of precision on the deposition region; ii) an energy transfer from, e.g., the injected O-mode to the X-mode, with a consequent loss of power and a possible contribution to stray radiation.

The code WKBeam describes electron-cyclotron beams in a tokamak plasma, accounting for the beam broadening by density fluctuations i) and it has been extended to include cross-polarization scattering ii). It relies on a solid mathematical model - the wave kinetic equation - derived with techniques from semiclassical analyis. The solution is obtained through a rigorously derived Monte-Carlo numerical scheme. We present some benchmark results with the full-wave code IPF-FDMC, together with preliminary results for ITER. In fact, while for existing tokamaks cross-polarization scattering is actually negligible, for some ITER scenarios this effect might be of a certain relevance. In particular, we observe a high sensitivity of our results to the model used for the fluctuations in the scrape-off-layer.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2017 > Bremen