Third-harmonic X-mode, real-time controlled top-launch ECW experiments on TCV Tokamak (Contributo in atti di convegno)

Type
Label
  • Third-harmonic X-mode, real-time controlled top-launch ECW experiments on TCV Tokamak (Contributo in atti di convegno) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/1742-6596/25/1/026 (literal)
Alternative label
  • Alberti S. (1), Arnoux G. (1), Porte L. (1), Bortolon A. (1), Karpushov A. (1), Martin Y. (1), Nowak S. (2), Pitts R.(1) and the TCV Team (2005)
    Third-harmonic X-mode, real-time controlled top-launch ECW experiments on TCV Tokamak
    in Third IAEA Technical Meeting on ECRH Physics and Technology in ITER, Como
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Alberti S. (1), Arnoux G. (1), Porte L. (1), Bortolon A. (1), Karpushov A. (1), Martin Y. (1), Nowak S. (2), Pitts R.(1) and the TCV Team (literal)
Pagina inizio
  • 210 (literal)
Pagina fine
  • 222 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://iopscience.iop.org/1742-6596/25/1/026 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#titoloVolume
  • Third IAEA Technical Meeting on ECRH Physics and Technology in ITER (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 25 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#volumeInCollana
  • 25 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • Journal of Physics Conference Series 25, 210-222 (2005) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • (1) Centre de Recherches en Physique des Plasmas (CRPP-PPB) Association EURATOM - Confédération Suisse Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland (2) Istituto di Fisica del Plasma, EURATOM-ENEA-CNR Association, Milano, Italy (literal)
Titolo
  • Third-harmonic X-mode, real-time controlled top-launch ECW experiments on TCV Tokamak (literal)
Abstract
  • 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. (literal)
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