Direct observation of electron-Bernstein wave heating by O-X-B-mode conversion at low magnetic field in the WEGA stellarator.
The ordinary-extraordinary-Bernstein-mode conversion process for overdense plasma heating with electron-Bernstein waves is demonstrated in the WEGA stellarator at low magnetic field (approximately 50 mT) at 2.45 GHz. For the first time the conversion from an O wave to an X wave is clearly demonstrated by probe measurements of amplitude and phase of the wave field in the conversion region and supported by two-dimensional full-wave calculations. The propagation and resonant absorption of the Bernstein wave is measured in fast power modulation experiments.
Podoba
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Max-Planck-Institut fur Plasmaphysik, EURATOM Association D-17491 Greifswald, Germany.
Laqua
H P
HP
Warr
G B
GB
Schubert
M
M
Otte
M
M
Marsen
S
S
Wagner
F
F
Holzhauer
E
E