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(PDP/7) Synergy between LH and ECH Waves in the FTU Tokamak

V. Pericoli-Ridolfini¹⁾, Y. Peysson²⁾, R. Dumont²⁾, G. Giruzzi²⁾, G. Granucci³⁾, L. Panaccione¹⁾, L. Delpech²⁾, B. Tilia¹⁾, FTU Team¹⁾, FTU-ECH Team^3)
 
1) Associazione Euratom-ENEA sulla Fusione, CR Frascati, 00044 Frascati, Rome, Italy
²⁾ Association Euratom-CEA sur la Fusion DRFC/SCCP, CEA/Cadarache, 13108 St. Paul-lez-Durance, France
³⁾ Associazione Euratom-ENEA-CNR sulla Fusione, Istituto di Fisica del Plasma, Via R. Cozzi 20125, Milano, Italy

Abstract.  The effects of the simultaneous injection of LH, up to 1 MW, and ECH power, up to 0.75 MW, have been studied in FTU. In the absence of the cold EC resonance in the plasma ( B_T = 7.2T), the suprathermal electron tail generated by LHCD absorbs the ECH power effectively, up to 80%. In a restricted parameter range, additional electron heating due to ECH waves (up to 1.2 keV for P_ECH = 0.7MW) is also observed. With the cold resonance at the centre ( B_T = 5.3T) and no absorption on the tail, the ECH power injection into a sawteeth and MHD free plasma, fully sustained by LHCD, causes a quasi-stationary large increase of the electron temperature in a region r/a < 0.5, with $\Delta$T_e0 > 4keV for P_ECH = 0.35MW only. This strong heating exceeds the predictions of the mixed Bohm/gyro-Bohm model with magnetic shear correction, which, instead reproduces the LH phase well.

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