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.
Max-Planck-Institut fur Plasmaphysik, EURATOM Association D-17491 Greifswald, Germany.
Y Y
YY
Podoba
H P
HP
Laqua
G B
GB
Warr
M
M
Schubert
M
M
Otte
S
S
Marsen
F
F
Wagner
E
E
Holzhauer