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  4. Third-harmonic X-mode, real-time controlled top-launch ECW experiments on TCV tokamak
 
conference paper

Third-harmonic X-mode, real-time controlled top-launch ECW experiments on TCV tokamak

Alberti, S.  
•
Arnoux, G.  
•
Porte, L.  
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2005
Journal of Physics: Conference Series
Third IAEA Technical Meeting on ECRH Physics and Technology for ITER

In the moderate magneticfield of TCV (1.5T), the recently installed X3 system (3 gyrotrons @118 GHz, 0.45 MW/each, 2s) broadens the operational space with the possibility of heating plasmas at high density, well above the cutoff density of the X2 system (X2 cutoff at ne = 4.2 × 1019m-3). To compensate the significantly weaker absorption coefficient compared to the absorption of X2, the top-launch injection allows to maximize the ray path along the resonance layer thus maximizing the optical depth. To maintain the maximum absorption in plasma discharges with a dynamic variation of both density (refraction) and temperature (relativistic shift) a real time control system on the poloidal injection angle has been developped and succesfully tested on TCV. With a total injected power of 1.35 MW and using the mirror realtime control, full-single pass absorption has been measured in an L-mode plasma. A significant fraction of the absorbed power is associated to the presence of suprathermal electrons generated by the X3 wave itself. In X3 heating experiments of H-mode plasmas it has been possible to enter into a different ELMy regime compared to the ohmic/low-power-heating ELMy regime. In these experiments a significant increase of the plasma energy is obtained with nearly fullsingle pass absorption. Results on the comparison of the absorbed fraction calculated with the TORAY-GA ray-tracing code and the beam-tracing code, ECWGB, which includes difiraction effects, are discussed.

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Type
conference paper
DOI
10.1088/1742-6596/25/1/026
Author(s)
Alberti, S.  
Arnoux, G.  
Porte, L.  
Bortolon, A.  
Karpushov, A.  
Martin, Y.  
Nowak, S.
Pitts, R.  
Date Issued

2005

Published in
Journal of Physics: Conference Series
Volume

25

Start page

210

End page

222

Note

With the TCV team

URL

URL

http://www.ifp.cnr.it/Conference/iaeatm/index.html
Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CRPP  
SPC  
Event nameEvent placeEvent date
Third IAEA Technical Meeting on ECRH Physics and Technology for ITER

Como, Italy

2005-05-02

Available on Infoscience
May 13, 2008
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/25379
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