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Lower hybrid current drive in FTU high density shear reversed discharges (Contributo in atti di convegno)

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Lower hybrid current drive in FTU high density shear reversed discharges (Contributo in atti di convegno) (literal)

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Tuccillo, AA; Barbato, E; Crisanti, F; Panaccione, L; Pericoli, V; Podda, S; Cirant, S; Acitelli, L; Alladio, F; Amadeo, P; Angelini, B; Apicella, ML; Apruzzese, G; Bertocchi, A; Borra, M; Bracco, G; Bruschi, A; Buceti, G; Buratti, P; Cardinali, A; Centioli, C; Cesario, R; Ciattaglia, S; Ciotti, M; Cocilovo, V; DeAngelis, R; DeMarco, F; Esposito, B; Frigione, D; Gabellieri, L; Gatti, G; Giovannozzi, E; Gourlan, C; Granucci, G; Grolli, M; Imparato, A; Kroegler, H; Leigheb, M; Lovisetto, L; Maddaluno, G; Maffia, G; Mancuso, A; Marinucci, M; Mazzitelli, G; Micozzi, P; Mirizzi, F; Orsitto, P; Pacella, D; Panella, M; Pieroni, L; Righetti, GB; Romanelli, F; Santini, F; Simonetto, A; Sozzi, C; Sternini, S; Tudisco, O; Valente, F; Vitale, V; Vlad, G; Zanza, V; Zerbini, M (1997)
Lower hybrid current drive in FTU high density shear reversed discharges
in 12th Topical Conference on Radio Frequency Power in Plasmas, SAVANNAH, GA, Apr 1997
(literal)

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Tuccillo, AA; Barbato, E; Crisanti, F; Panaccione, L; Pericoli, V; Podda, S; Cirant, S; Acitelli, L; Alladio, F; Amadeo, P; Angelini, B; Apicella, ML; Apruzzese, G; Bertocchi, A; Borra, M; Bracco, G; Bruschi, A; Buceti, G; Buratti, P; Cardinali, A; Centioli, C; Cesario, R; Ciattaglia, S; Ciotti, M; Cocilovo, V; DeAngelis, R; DeMarco, F; Esposito, B; Frigione, D; Gabellieri, L; Gatti, G; Giovannozzi, E; Gourlan, C; Granucci, G; Grolli, M; Imparato, A; Kroegler, H; Leigheb, M; Lovisetto, L; Maddaluno, G; Maffia, G; Mancuso, A; Marinucci, M; Mazzitelli, G; Micozzi, P; Mirizzi, F; Orsitto, P; Pacella, D; Panella, M; Pieroni, L; Righetti, GB; Romanelli, F; Santini, F; Simonetto, A; Sozzi, C; Sternini, S; Tudisco, O; Valente, F; Vitale, V; Vlad, G; Zanza, V; Zerbini, M (literal)

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Lower hybrid current drive in FTU high density shear reversed discharges (literal)

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Abstract

Results are reported of the 8 GHz Lower Hybrid experiments on FTU after the installation of the new toroidal limiter. A figure of merit of the Current Drive efficiency eta(CD) approximate to 0.11.10(20) A/Wm(2) is estimated for plasma density <(n)over bar (e)> = 10(20) m(-3) and no appreciable broadening of the launched frequency is detected. In low density experiments sawteeth are stabilised and m = 1 activity is present in the plasma. Shear reversed discharges with large reversal radius, r(S)/a approximate to 0.5, are obtained at higher density, lower temperature, B-T = 4 T, q(a) approximate to 5.5, by off-axis LH CD. The reversed configurations exhibit high central temperature coexisting with regular m = 2, n = 1 relaxations of large amplitude and are maintained up to LH switch off. At higher magnetic field, B = 5.2 T, q(a) approximate to 7, irregular DTM crashes are present during the whole LH pulse. Confinement time of radiofrequency heated discharges (P-LH = 0.5 divided by 2.P-OH) exhibits the same behaviour of FTU ohmic discharges following the ITER89-P scaling. Preliminary results of central 140 GHz Electron Cyclotron Resonant Heating (ECRH) during the plasma current ramp-up, aimed at obtaining shear reversed configurations are also reported. (literal)

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