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1. Overview of the FTU results

Author

Pucella, G., primary, Alessi, E., additional, Almaviva, S., additional, Angelini, B., additional, Apicella, M.L., additional, Apruzzese, G., additional, Aquilini, M., additional, Artaserse, G., additional, Baiocchi, B., additional, Baruzzo, M., additional, Belli, F., additional, Bin, W., additional, Bombarda, F., additional, Boncagni, L., additional, Briguglio, S., additional, Bruschi, A., additional, Buratti, P., additional, Calabrò, G., additional, Cappelli, M., additional, Cardinali, A., additional, Carlevaro, N., additional, Carnevale, D., additional, Carraro, L., additional, Castaldo, C., additional, Causa, F., additional, Cavazzana, R., additional, Ceccuzzi, S., additional, Cefali, P., additional, Centioli, C., additional, Cesario, R., additional, Cesaroni, S., additional, Cianfarani, C., additional, Ciotti, M., additional, Claps, G., additional, Cordella, F., additional, Crisanti, F., additional, Damizia, Y., additional, D’Arcangelo, O., additional, De Angeli, M., additional, Di Ferdinando, E., additional, Di Giovenale, S., additional, Di Troia, C., additional, Dodaro, A., additional, Esposito, B., additional, Falessi, M., additional, Fanale, F., additional, Farina, D., additional, Figini, L., additional, Fogaccia, G., additional, Frigione, D., additional, Fusco, V., additional, Gabellieri, L., additional, Gallerano, G., additional, Garavaglia, S., additional, Ghillardi, G., additional, Giacomi, G., additional, Giovannozzi, E., additional, Gittini, G., additional, Granucci, G., additional, Grosso, G., additional, Grosso, L.A., additional, Iafrati, M., additional, Laguardia, L., additional, Lazzaro, E., additional, Liuzza, D., additional, Lontano, M., additional, Maddaluno, G., additional, Magagnino, S., additional, Marinucci, M., additional, Marocco, D., additional, Mazzitelli, G., additional, Mazzotta, C., additional, Meineri, C., additional, Mellera, V., additional, Mezzacappa, M., additional, Milovanov, A., additional, Minelli, D., additional, Mirizzi, F.C., additional, Montani, G., additional, Moro, A., additional, Napoli, F., additional, Nowak, S., additional, Orsitto, F.P., additional, Pacella, D., additional, Pallotta, F., additional, Palomba, S., additional, Panaccione, L., additional, Pensa, A., additional, Pericoli-Ridolfini, V., additional, Petrolini, P., additional, Piergotti, V., additional, Piron, C., additional, Pizzuto, A., additional, Podda, S., additional, Puiatti, M.E., additional, Ramogida, G., additional, Raspante, B., additional, Ravera, G., additional, Ricci, D., additional, Rispoli, N., additional, Rocchi, G., additional, Romano, A., additional, Rubino, G., additional, Rueca, S., additional, Scisciò, M., additional, Senni, L., additional, Sibio, A., additional, Simonetto, A., additional, Sozzi, C., additional, Tartari, U., additional, Taschin, A., additional, Tilia, B., additional, Trentuno, G., additional, Tuccillo, A.A., additional, Tudisco, O., additional, Tulli, R., additional, Valisa, M., additional, Vellucci, M., additional, Viola, B., additional, Vitale, E., additional, Vlad, G., additional, Zannetti, D., additional, Zaniol, B., additional, Zerbini, M., additional, Zonca, F., additional, Zotta, V.K., additional, Angelone, M., additional, Barcellona, C., additional, Calacci, L., additional, Caneve, L., additional, Colao, F., additional, Coppi, B., additional, Galeani, S., additional, Galperti, C., additional, Gasior, P., additional, Gromelski, W., additional, Hoppe, M., additional, Kubkowska, M., additional, Lazic, V., additional, Lehnen, M., additional, Marinelli, M., additional, Martinelli, F., additional, Milani, E., additional, Mosetti, P., additional, Muscente, P., additional, Nardon, E., additional, Passeri, M., additional, Reale, A., additional, Sassano, M., additional, Selce, A., additional, Verona, C., additional, and Verona-Rinati, G., additional

Published
2022
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2. Overview of the FTU results

Author

Pucella, G, Alessi, E, Angelini, B, Apicella, M, Apruzzese, G, Artaserse, G, Baiocchi, B, Belli, F, Bin, W, Bombarda, F, Boncagni, L, Botrugno, A, Briguglio, S, Bruschi, A, Buratti, P, Calabro, G, Cappelli, M, Cardinali, A, Carnevale, D, Carraro, L, Castaldo, C, Causa, F, Ceccuzzi, S, Centioli, C, Cesario, R, Cianfarani, C, Claps, G, Cocilovo, V, Cordella, F, Crisanti, F, D'Arcangelo, O, De Angeli, M, Di Troia, C, Esposito, B, Fanale, F, Farina, D, Figini, L, Fogaccia, G, Frigione, D, Fusco, V, Gabellieri, L, Garavaglia, S, Giovannozzi, E, Gittini, G, Granucci, G, Grosso, G, Iafrati, M, Iannone, F, Laguardia, L, Lazzaro, E, Lontano, M, Maddaluno, G, Magagnino, S, Marinucci, M, Marocco, D, Mazzitelli, G, Mazzotta, C, Mellera, V, Milovanov, A, Minelli, D, Mirizzi, F, Moro, A, Nowak, S, Pacella, D, Pallotta, F, Panaccione, L, Panella, M, Pericoli-Ridolfini, V, Pizzuto, A, Podda, S, Puiatti, M, Ramogida, G, Ravera, G, Ricci, D, Romano, A, Simonetto, A, Sozzi, C, Tartari, U, Tuccillo, A, Tudisco, O, Valisa, M, Viola, B, Vitale, E, Vlad, G, Zeniol, B, Zerbini, M, Zonca, F, Aquilini, M, Cefali, P, Di Ferdinando, E, Di Giovenale, S, Giacomi, G, Grosso, A, Mezzacappa, M, Pensa, A, Petrolini, P, Piergotti, V, Raspante, B, Rocchi, G, Sibio, A, Tilia, B, Tulli, R, Vellucci, M, Zannetti, D, Almaviva, S, Bagnato, F, Brolatti, G, Buscarino, A, Calacci, L, Caneve, L, Carlini, M, Colao, F, Corradino, C, Costa, P, Crescenzi, F, Cucchiaro, A, Doria, A, Ferro, G, Gabrielli, A, Galeani, S, Galperti, C, Gasior, P, Giovenale, E, Gospodarczyk, M, Jakubowski, L, Kubkowska, M, Lampasi, A, Lazic, V, Lubyako, L, Maffia, G, Martinelli, F, Solis, J, Maviglia, F, Mazzuca, R, Moneti, M, Orsitto, F, Palucci, A, Passeri, M, Popovic, Z, Possieri, C, Rabinski, M, Ratynskaia, S, Reale, M, Roccella, S, Sassano, M, Starace, F, Tolias, P, Vertkov, A, Zebrowski, J, Zito, P, Pucella, G., Alessi, E., Angelini, B., Apicella, M. L., Apruzzese, G., Artaserse, G., Baiocchi, B., Belli, F., Bin, W., Bombarda, F., Boncagni, L., Botrugno, A., Briguglio, S., Bruschi, A., Buratti, P., Calabro, G., Cappelli, M., Cardinali, A., Carnevale, D., Carraro, L., Castaldo, C., Causa, F., Ceccuzzi, S., Centioli, C., Cesario, R., Cianfarani, C., Claps, G., Cocilovo, V., Cordella, F., Crisanti, F., D'Arcangelo, O., De Angeli, M., Di Troia, C., Esposito, B., Fanale, F., Farina, D., Figini, L., Fogaccia, G., Frigione, D., Fusco, V., Gabellieri, L., Garavaglia, S., Giovannozzi, E., Gittini, G., Granucci, G., Grosso, G., Iafrati, M., Iannone, F., Laguardia, L., Lazzaro, E., Lontano, M., Maddaluno, G., Magagnino, S., Marinucci, M., Marocco, D., Mazzitelli, G., Mazzotta, C., Mellera, V., Milovanov, A., Minelli, D., Mirizzi, F. C., Moro, A., Nowak, S., Pacella, D., Pallotta, F., Panaccione, L., Panella, M., Pericoli-Ridolfini, V., Pizzuto, A., Podda, S., Puiatti, M. E., Ramogida, G., Ravera, G., Ricci, D., Romano, A., Simonetto, A., Sozzi, C., Tartari, U., Tuccillo, A. A., Tudisco, O., Valisa, M., Viola, B., Vitale, E., Vlad, G., Zeniol, B., Zerbini, M., Zonca, F., Aquilini, M., Cefali, P., Di Ferdinando, E., Di Giovenale, S., Giacomi, G., Grosso, A., Mezzacappa, M., Pensa, A., Petrolini, P., Piergotti, V., Raspante, B., Rocchi, G., Sibio, A., Tilia, B., Tulli, R., Vellucci, M., Zannetti, D., Almaviva, S., Bagnato, F., Brolatti, G., Buscarino, A., Calacci, L., Caneve, L., Carlini, M., Colao, F., Corradino, C., Costa, P., Crescenzi, F., Cucchiaro, A., Doria, A., Ferro, G., Gabrielli, A., Galeani, S., Galperti, C., Gasior, P., Giovenale, E., Gospodarczyk, M., Jakubowski, L., Kubkowska, M., Lampasi, A., Lazic, V., Lubyako, L., Maffia, G., Martinelli, F., Martin Solis, J. R., Maviglia, F., Mazzuca, R., Moneti, M., Orsitto, F. P., Palucci, A., Passeri, M., Popovic, Z., Possieri, C., Rabinski, M., Ratynskaia, S., Reale, M., Roccella, S., Sassano, M., Starace, F., Tolias, P., Vertkov, A., Zebrowski, J., and Zito, P.

Subjects
Settore ING-INF/03, Nuclear and High Energy Physics, FTU, overview, tokamak, Condensed Matter Physics, 01 natural sciences, 7. Clean energy, 010305 fluids & plasmas, Physics::Plasma Physics, 0103 physical sciences, Astrophysics::Earth and Planetary Astrophysics, 010306 general physics
Abstract

Since the 2016 IAEA Fusion Energy Conference, FTU operations have been mainly devoted to experiments on runaway electrons and investigations into a tin liquid limiter; other experiments have involved studies of elongated plasmas and dust. The tearing mode onset in the high density regime has been studied by means of the linear resistive code MARS, and the highly collisional regimes have been investigated. New diagnostics, such as a runaway electron imaging spectroscopy system for in-flight runaway studies and a triple Cherenkov probe for the measurement of escaping electrons, have been successfully installed and tested, and new capabilities of the collective Thomson scattering and the laser induced breakdown spectroscopy diagnostics have been explored.

Published
2019

3. Overview of the FTU results

Author

Pucella, G, Alessi, E, Amicucci, L, Angelini, B, Apicella, Ml, Apruzzese, G, Artaserse, G, Belli, F, Bin, W, Boncagni, L, Botrugno, A, Briguglio, S, Bruschi, A, Buratti, P, Calabrò, G, Cappelli, M, Cardinali, A, Castaldo, C, Causa, F, Ceccuzzi, S, Centioli, C, Cesario, R, Cianfarani, C, Claps, G, Cocilovo, V, Cordella, F, Crisanti, F, D'Arcangelo, O, De Angeli, M, Di Troia, C, Esposito, B, Farina, D, Figini, L, Fogaccia, G, Frigione, D, Fusco, V, Gabellieri, L, Garavaglia, S, Giovannozzi, E, Granucci, G, Iafrati, M, Iannone, F, Lontano, M, Maddaluno, G, Magagnino, S, Marinucci, M, Marocco, D, Mazzitelli, G, Mazzotta, C, Milovanov, A, Minelli, D, Mirizzi, Fc, Moro, A, Nowak, S, Pacella, D, Panaccione, L, Panella, M, Pericoli-Ridolfini, V, Pizzuto, A, Podda, S, Ramogida, G, Ravera, G, Ricci, D, Romano, A, Sozzi, C, Tuccillo, Aa, Tudisco, O, Viola, B, Vitale, V, Vlad, G, Zerbini, M, Zonca, F, Aquilini, M, Cefali, P, Ferdin, D, O, E, Di Giovenale, S, Giacomi, G, Grosso, A, Mellera, V, Mezzacappa, M, Pensa, A, Petrolini, P, Piergotti, V, Raspante, B, Rocchi, G, Sibio, A, Tilia, B, Tulli, R, Vellucci, M, Zannetti, D, Bogdanovic-Radovic, I, Carnevale, D, Casolari, A, Ciotti, M, Conti, C, Dinca, Pp, Dolci, V, Galperti, C, Gospodarczyk, M, Grosso, G, Lubiako, L, Lungu, M, Martin-Solis, Jr, Meineri, C, Murtas, F, Nardone, A, Orsitto, Fp, Perelli Cippo, E, Popovic, Z, Ripamonti, D, Simonetto, A, Tartari, U, European Commission, Meineri, C., Dolci, V., Ciotti, M., Zannetti, D., Vellucci, M., Tulli, R., Tilia, B., Sibio, A., Rocchi, G., Raspante, B., Piergotti, V., Petrolini, P., Pensa, A., Mezzacappa, M., Grosso, A., Giacomi, G., Di Giovenale, S., Di Ferdinando, E., Cefali, P., Aquilini, M., Zonca, F., Zerbini, M., Vlad, G., Vitale, V., Viola, B., Tudisco, O., Tuccillo, A. A., Romano, A., Ravera, G., Ramogida, G., Podda, S., Pizzuto, A., Pacella, D., Milovanov, A., Mazzotta, C., Mazzitelli, G., Marocco, D., Marinucci, M., Maddaluno, G., Iannone, F., Iafrati, M., Giovannozzi, E., Gabellieri, L., Fusco, V., Frigione, D., Fogaccia, G., Esposito, B., Di Troia, C., D'Arcangelo, O., Crisanti, F., Cordella, F., Cocilovo, V., Claps, G., Cianfarani, C., Cesario, R., Centioli, C., Ceccuzzi, S., Causa, F., Castaldo, C., Cardinali, A., Cappelli, M., Calabrò, G., Buratti, P., Briguglio, S., Botrugno, A., Boncagni, L., Belli, F., Artaserse, G., Apruzzese, G., Apicella, M. L., Angelini, B., Amicucci, L., and Pucella, G.

Subjects
tokamak, FTU, overview, Nuclear and High Energy Physics, Tokamak FTU, Física, Condensed Matter Physics, 01 natural sciences, 7. Clean energy, 010305 fluids & plasmas, Runaway electrons, Settore ING-INF/04 - Automatica, 0103 physical sciences, tokamak, overview, FTU, 010306 general physics, Tokamak plasmas
Abstract

Experiments on runaway electrons have been performed for the determination of the critical electric field for runaway generation. A large database of post-disruption runaway beams has been analyzed in order to identify linear dynamical models for new position and current runaway beam controllers, and experiments of electron cyclotron assisted plasma start-up have shown the presence of runaway electrons also below the expected electric field threshold, indicating that the radio-frequency power acts as seeding for fast electrons. A linear micro-stability analysis of neon-doped pulses has been carried out to investigate the mechanisms leading to the observed density peaking. A study of the ion drift effects on the MARFE instability has been performed and the peaking of density profile in the high density regime has been well reproduced using a thermo-diffusive pinch in the particle transport equation. The study of the density limit performed in the past has been extended towards lower values of toroidal magnetic field and plasma current. The analysis of the linear stability of the 2/1 tearing mode observed in high density plasmas has highlighted a destabilization with increasing peaking of the current profile during the density ramp-up, while the final phase of the mode temporal evolution is characterized by limit cycles on the amplitude/frequency plane. A liquid lithium limiter with thermal load capability up to 10 MW m−2 has been tested. The pulse duration has been extended up to 4.5 s and elongated configurations have been obtained for 3.5 s, with the X-point just outside the plasma chamber. A W/Fe sample has been exposed in the scrape-off layer in order to study the sputtering of Fe and the W enrichment of the surface layer. Dusts have been collected and analyzed, showing that the metallic population exhibits a high fraction of magnetic grains. A new diagnostic for in-flight runaway electron studies has allowed the image and the visible/infrared spectrum of the forward and backward synchrotron radiation to be provided simultaneously. A fast infrared camera for thermo-graphic analysis has provided the pattern of the toroidal limiter heating by disruption heat loads, and a triple-GEM detector has been tested for soft x-ray diagnostics. The collective Thomson scattering diagnostic has been upgraded and used for investigations on parametric decay instability excitation by electron cyclotron beams correlated with magnetic islands, and new capabilities of the Cherenkov probe have been explored in the presence of beta-induced Alfvén eigenmodes associated to high amplitude magnetic islands. This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Publicado

Published
2017

4. Overview of the FTU results

Author

Pucella, G., primary, Alessi, E., additional, Amicucci, L., additional, Angelini, B., additional, Apicella, M.L., additional, Apruzzese, G., additional, Artaserse, G., additional, Belli, F., additional, Bin, W., additional, Boncagni, L., additional, Botrugno, A., additional, Briguglio, S., additional, Bruschi, A., additional, Buratti, P., additional, Calabrò, G., additional, Cappelli, M., additional, Cardinali, A., additional, Castaldo, C., additional, Causa, F., additional, Ceccuzzi, S., additional, Centioli, C., additional, Cesario, R., additional, Cianfarani, C., additional, Claps, G., additional, Cocilovo, V., additional, Cordella, F., additional, Crisanti, F., additional, D’Arcangelo, O., additional, De Angeli, M., additional, Di Troia, C., additional, Esposito, B., additional, Farina, D., additional, Figini, L., additional, Fogaccia, G., additional, Frigione, D., additional, Fusco, V., additional, Gabellieri, L., additional, Garavaglia, S., additional, Giovannozzi, E., additional, Granucci, G., additional, Iafrati, M., additional, Iannone, F., additional, Lontano, M., additional, Maddaluno, G., additional, Magagnino, S., additional, Marinucci, M., additional, Marocco, D., additional, Mazzitelli, G., additional, Mazzotta, C., additional, Milovanov, A., additional, Minelli, D., additional, Mirizzi, F.C., additional, Moro, A., additional, Nowak, S., additional, Pacella, D., additional, Panaccione, L., additional, Panella, M., additional, Pericoli-Ridolfini, V., additional, Pizzuto, A., additional, Podda, S., additional, Ramogida, G., additional, Ravera, G., additional, Ricci, D., additional, Romano, A., additional, Sozzi, C., additional, Tuccillo, A.A., additional, Tudisco, O., additional, Viola, B., additional, Vitale, V., additional, Vlad, G., additional, Zerbini, M., additional, Zonca, F., additional, Aquilini, M., additional, Cefali, P., additional, Di Ferdinando, E., additional, Di Giovenale, S., additional, Giacomi, G., additional, Grosso, A., additional, Mellera, V., additional, Mezzacappa, M., additional, Pensa, A., additional, Petrolini, P., additional, Piergotti, V., additional, Raspante, B., additional, Rocchi, G., additional, Sibio, A., additional, Tilia, B., additional, Tulli, R., additional, Vellucci, M., additional, Zannetti, D., additional, Bogdanovic-Radovic, I., additional, Carnevale, D., additional, Casolari, A., additional, Ciotti, M., additional, Conti, C., additional, Dinca, P.P., additional, Dolci, V., additional, Galperti, C., additional, Gospodarczyk, M., additional, Grosso, G., additional, Lubiako, L., additional, Lungu, M., additional, Martin-Solis, J.R., additional, Meineri, C., additional, Murtas, F., additional, Nardone, A., additional, Orsitto, F.P., additional, Perelli Cippo, E., additional, Popovic, Z., additional, Ripamonti, D., additional, Simonetto, A., additional, and Tartari, U., additional

Published
2017
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5. Overview of the FTU results

Author

Pucella, G., primary, Alessi, E., additional, Amicucci, L., additional, Angelini, B., additional, Apicella, M.L., additional, Apruzzese, G., additional, Artaserse, G., additional, Barbato, E., additional, Belli, F., additional, Bertocchi, A., additional, Bin, W., additional, Boncagni, L., additional, Botrugno, A., additional, Briguglio, S., additional, Bruschi, A., additional, Buratti, P., additional, Calabrò, G., additional, Cardinali, A., additional, Castaldo, C., additional, Causa, F., additional, Ceccuzzi, S., additional, Centioli, C., additional, Cesario, R., additional, Cianfarani, C., additional, Cocilovo, V., additional, Crisanti, F., additional, D'Arcangelo, O., additional, De Angeli, M., additional, De Angelis, R., additional, Di Troia, C., additional, Esposito, B., additional, Farina, D., additional, Figini, L., additional, Fogaccia, G., additional, Frigione, D., additional, Fusco, V., additional, Gabellieri, L., additional, Galperti, C., additional, Garavaglia, S., additional, Giovannozzi, E., additional, Granucci, G., additional, Iannone, F., additional, Lontano, M., additional, Maddaluno, G., additional, Marchetto, C., additional, Marinucci, M., additional, Marocco, D., additional, Mazzitelli, G., additional, Mazzotta, C., additional, Milovanov, A., additional, Minelli, D., additional, Mirizzi, F.C., additional, Moro, A., additional, Nowak, S., additional, Orsitto, F.P., additional, Pacella, D., additional, Panaccione, L., additional, Panella, M., additional, Pericoli-Ridolfini, V., additional, Pizzuto, A., additional, Podda, S., additional, Ramogida, G., additional, Ravera, G., additional, Romano, A., additional, Sozzi, C., additional, Tuccillo, A.A., additional, Tudisco, O., additional, Viola, B., additional, Vitale, E., additional, Vlad, G., additional, Zanza, V., additional, Zerbini, M., additional, Zonca, F., additional, Aquilini, M., additional, Cefali, P., additional, Di Ferdinando, E., additional, Di Giovenale, S., additional, Giacomi, G., additional, Grosso, A., additional, Mellera, V., additional, Mezzacappa, M., additional, Pensa, A., additional, Petrolini, P., additional, Piergotti, V., additional, Raspante, B., additional, Rocchi, G., additional, Sibio, A., additional, Tilia, B., additional, Tulli, R., additional, Vellucci, M., additional, Zannetti, D., additional, Almaviva, S., additional, Canal, G., additional, Caneve, L., additional, Carnevale, D., additional, Cavinato, M., additional, Cirant, S., additional, Colao, F., additional, Crescenzi, F., additional, Duval, B., additional, Fantoni, R., additional, Federspiel, L., additional, Galeani, S., additional, Grosso, G., additional, Jakubowski, L., additional, Karpushov, A., additional, Kim, D., additional, Lazzaro, E., additional, Lyublinski, I., additional, Malinowski, K., additional, Martin-Solis, J.R., additional, Maviglia, F., additional, Mosconi, M., additional, Popovic, Z., additional, Rabinski, M., additional, Reale, M., additional, Reimerdes, H., additional, Ricci, D., additional, Riva, M., additional, Roccella, S., additional, Rossel, J., additional, Sadowski, M.J., additional, Sassano, M., additional, Sauter, O., additional, Testa, D., additional, Vertkov, A., additional, Wagner, D., additional, and Zebrowski, J., additional

Published
2015
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6. An overview of FTU results

Author

Buratti, P., primary, Alessi, E., additional, Amicucci, L., additional, Angelini, B., additional, Apicella, M.L., additional, Apruzzese, G., additional, Artaserse, G., additional, Barbato, E., additional, Belli, F., additional, Bertocchi, A., additional, Bin, W., additional, Boncagni, L., additional, Botrugno, A., additional, Briguglio, S., additional, Bruschi, A., additional, Calabrò, G., additional, Cardinali, A., additional, Castaldo, C., additional, Ceccuzzi, S., additional, Centioli, C., additional, Cesario, R., additional, Cianfarani, C., additional, Cirant, S., additional, Crisanti, F., additional, D'Arcangelo, O., additional, De Angeli, M., additional, De Angelis, R., additional, Di Matteo, L., additional, Di Troia, C., additional, Esposito, B., additional, Farina, D., additional, Figini, L., additional, Fogaccia, G., additional, Frigione, D., additional, Fusco, V., additional, Gabellieri, L., additional, Galperti, C., additional, Garavaglia, S., additional, Giovannozzi, E., additional, Granucci, G., additional, Grossetti, G., additional, Grosso, G., additional, Guimarães-Filho, Z.O., additional, Iannone, F., additional, Krivska, A., additional, Kroegler, H., additional, Lazzaro, E., additional, Lontano, M., additional, Maddaluno, G., additional, Marchetto, C., additional, Marinucci, M., additional, Marocco, D., additional, Mazzitelli, G., additional, Mazzotta, C., additional, Milovanov, A., additional, Minelli, D., additional, Mirizzi, F.C., additional, Moro, G.A., additional, Napoli, F., additional, Nowak, S., additional, Orsitto, F.P., additional, Pacella, D., additional, Panaccione, L., additional, Panella, M., additional, Pericoli-Ridolfini, V., additional, Podda, S., additional, Pizzuto, A., additional, Pucella, G., additional, Ramogida, G., additional, Ravera, G., additional, Romano, A., additional, Sozzi, C., additional, Tuccillo, A.A., additional, Tudisco, O., additional, Viola, B., additional, Vitale, V., additional, Vlad, G., additional, Zanza, V., additional, Zerbini, M., additional, Zonca, F., additional, Aquilini, M., additional, Cefali, P., additional, Di Ferdinando, E., additional, Di Giovenale, S., additional, Giacomi, G., additional, Gravanti, F., additional, Grosso, A., additional, Mellera, V., additional, Mezzacappa, M., additional, Pensa, A., additional, Petrolini, P., additional, Piergotti, V., additional, Raspante, B., additional, Rocchi, G., additional, Sibio, A., additional, Tilia, B., additional, Torelli, C., additional, Tulli, R., additional, Vellucci, M., additional, and Zannetti, D., additional

Published
2013
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7. Overview of FTU results

Author

Tuccillo, A.A., primary, Amicucci, L., additional, Angelini, B., additional, Apicella, M.L., additional, Apruzzese, G., additional, Barbato, E., additional, Belli, F., additional, Bertocchi, A., additional, Biancalani, A., additional, Bierwage, A., additional, Bin, W., additional, Boncagni, L., additional, Botrugno, A., additional, Bracco, G., additional, Breyannis, G., additional, Briguglio, S., additional, Bruschi, A., additional, Buratti, P., additional, Calabrò, G., additional, Cardinali, A., additional, Castaldo, C., additional, Ceccuzzi, S., additional, Centioli, C., additional, Cesario, R., additional, Chavdarovski, I., additional, Chen, L., additional, Cianfarani, C., additional, Cirant, S., additional, Coletti, R., additional, Crisanti, F., additional, D'Arcangelo, O., additional, De Angeli, M., additional, De Angelis, R., additional, De Luca, F., additional, Matteo, L. Di, additional, Troia, C. Di, additional, Esposito, B., additional, Fogaccia, G., additional, Frigione, D., additional, Fusco, V., additional, Gabellieri, L., additional, Garavaglia, A., additional, Garzotti, L., additional, Giovannozzi, E., additional, Granucci, G., additional, Grossetti, G., additional, Grosso, G., additional, Guimarães-Filho, Z.O., additional, Iannone, F., additional, Jacchia, A., additional, Kroegler, H., additional, Lazzaro, E., additional, Lontano, M., additional, Maddaluno, G., additional, Marinucci, M., additional, Marocco, D., additional, Mazzitelli, G., additional, Mazzotta, C., additional, Milovanov, A., additional, Mirizzi, F.C., additional, Monari, G., additional, Moro, A., additional, Nowak, S., additional, Orsitto, F.P., additional, Pacella, D., additional, Panaccione, L., additional, Panella, M., additional, Pegoraro, F., additional, Pericoli-Ridolfini, V., additional, Podda, S., additional, Pizzuto, A., additional, Pucella, G., additional, Ramogida, G., additional, Ravera, G., additional, Romanelli, M., additional, Romano, A., additional, Ramponi, G., additional, Sozzi, C., additional, Szepesi, G., additional, Sternini, E., additional, Tudisco, O., additional, Vitale, E., additional, Vlad, G., additional, Zanza, V., additional, Zerbini, M., additional, Zonca, F., additional, Wang, X., additional, Aquilini, M., additional, Cefali, P., additional, Ferdinando, E. Di, additional, Giovenale, S. Di, additional, Giacomi, G., additional, Gravanti, F., additional, Grosso, A., additional, Mellera, V., additional, Mezzacappa, M., additional, Muzzini, V., additional, Pensa, A., additional, Petrolini, P., additional, Piergotti, V., additional, Raspante, B., additional, Rocchi, G., additional, Sibio, A., additional, Tilia, B., additional, Torelli, C., additional, Tulli, R., additional, Vellucci, M., additional, and Zannetti, D., additional

Published
2011
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9. Analysis of runaway electron expulsion during tokamak instabilities detected by a single-channel Cherenkov probe in FTU

Author

Causa, F., Buratti, P., Alessi, E., Angelini, B., Apicella, M. L., Apruzzese, G., Artaserse, G., Baiocchi, B., Belli, F., Bin, W., Bombarda, F., Boncagni, L., Botrugno, A., Briguglio, S., Bruschi, A., Calabro, G., Cappelli, M., Cardinali, A., Carnevale, D., Carraro, L., Castaldo, C., Ceccuzzi, S., Centioli, C., Cesario, R., Cianfarani, C., Claps, G., Cocilovo, V., Cordella, F., Crisanti, F., D'Arcangelo, O., De Angeli, M., Di Troia, C., Esposito, B., Fanale, F., Farina, D., Figini, L., Fogaccia, G., Frigione, D., Fusco, V., Gabellieri, L., Garavaglia, S., Giovannozzi, E., Gittini, G., Granucci, G., Grosso, G., Iafrati, M., Iannone, F., Laguardia, L., Lazzaro, E., Lontano, M., Maddaluno, G., Magagnino, S., Marinucci, M., Marocco, D., Mazzitelli, G., Mazzotta, C., Mellera, V., Milovanov, A., Minelli, D., Mirizzi, F. C., Moro, A., Nowak, S., Pacella, D., Pallotta, F., Panaccione, L., Panella, M., Pericoli-Ridolfini, V., Pizzuto, A., Podda, S., Pucella, G., Puiatti, M. E., Ramogida, G., Ravera, G., Ricci, D., Romano, A., Simonetto, A., Sozzi, C., Tartari, U., Tuccillo, A. A., Tudisco, O., Valisa, M., Viola, B., Vitale, E., Vlad, G., Zeniol, B., Zerbini, M., Zonca, F., Aquilini, M., Cefali, P., Di Ferdinando, E., Di Giovenale, S., Giacomi, G., Grosso, A., Mezzacappa, M., Pensa, A., Petrolini, P., Piergotti, V., Raspante, B., Rocchi, G., Sibio, A., Tilia, B., Tulli, R., Vellucci, M., Zannetti, D., Almaviva, S., Bagnato, F., Brolatti, G., Buscarino, A., Calacci, L., Caneve, L., Carlini, M., Colao, F., Corradino, C., Costa, P., Crescenzi, F., Cucchiaro, A., Ferro, G., Gabrielli, A., Galeani, S., Galperti, C., Gasior, P., Gospodarczyk, M., Jakubowski, L., Kubkowska, M., Lampasi, A., Lazic, V., Lubyako, L., Maffia, G., Martinelli, F., Martin-Solis, J. R., Maviglia, F., Mazzuca, R., Moneti, M., Orsitto, F. P., Palucci, A., Passeri, M., Popovic, Z., Possieri, C., Rabinski, M., Ratynskaia, S., Reale, M., Roccella, S., Sassano, M., Starace, F., Tolias, P., Vertkov, A., Zebrowski, J., and Zito, P.

Subjects
Physics::Plasma Physics, Astrophysics::High Energy Astrophysical Phenomena, runaway electrons, plasma instabilities, dynamics, cherenkov probe
Abstract

The expulsion of runaway electrons (REs) during different types of tokamak instabilities is analysed by means of a Cherenkov probe inserted into the scrape-off layer of the FTU tokamak. One such type of instability, the well-known tearing mode, is involved in disruptive plasma termination events, during which the risk of RE avalanche multiplication is highest. The second type, known as anomalous Doppler instability, influences RE dynamics by enhancing pitch angle scattering. Three scenarios are analysed here, characterised by different RE generation rates and mechanisms. The main conclusions are drawn from correlations between the Cherenkov probe and other diagnostics. In particular, the Cherenkov probe permits the detection of fast electron expulsion with a high level of detail, presenting peaks with 100% signal contrast during tearing mode growth and rotation, and sub-peak structures reflecting the interplay between the magnetic island formed by the tearing mode, RE diffusion during island rotation and the geometry of obstacles in the vessel. Correlations between the Cherenkov signal, hard x-ray emission and electron cyclotron emission reveal the impulsive development of the anomalous Doppler instability with instability rise time in the microsecond scale resolved by the high time-resolution of the Cherenkov probe.

10. Analysis of runaway electron expulsion during tokamak instabilities detected by a single-channel Cherenkov probe in FTU

Author

Causa, F., Buratti, P., Alessi, E., Angelini, B., Apicella, M. L., Apruzzese, G., Artaserse, G., Baiocchi, B., Belli, F., Bin, W., Bombarda, F., Boncagni, L., Botrugno, A., Briguglio, S., Bruschi, A., Calabro, G., Cappelli, M., Cardinali, A., Carnevale, D., Carraro, L., Castaldo, C., Ceccuzzi, S., Centioli, C., Cesario, R., Cianfarani, C., Claps, G., Cocilovo, V., Cordella, F., Crisanti, F., D'Arcangelo, O., De Angeli, M., Di Troia, C., Esposito, B., Fanale, F., Farina, D., Figini, L., Fogaccia, G., Frigione, D., Fusco, V., Gabellieri, L., Garavaglia, S., Giovannozzi, E., Gittini, G., Granucci, G., Grosso, G., Iafrati, M., Iannone, F., Laguardia, L., Lazzaro, E., Lontano, M., Maddaluno, G., Magagnino, S., Marinucci, M., Marocco, D., Mazzitelli, G., Mazzotta, C., Mellera, V., Milovanov, A., Minelli, D., Mirizzi, F. C., Moro, A., Nowak, S., Pacella, D., Pallotta, F., Panaccione, L., Panella, M., Pericoli-Ridolfini, V., Pizzuto, A., Podda, S., Pucella, G., Puiatti, M. E., Ramogida, G., Ravera, G., Ricci, D., Romano, A., Simonetto, A., Sozzi, C., Tartari, U., Tuccillo, A. A., Tudisco, O., Valisa, M., Viola, B., Vitale, E., Vlad, G., Zeniol, B., Zerbini, M., Zonca, F., Aquilini, M., Cefali, P., Di Ferdinando, E., Di Giovenale, S., Giacomi, G., Grosso, A., Mezzacappa, M., Pensa, A., Petrolini, P., Piergotti, V., Raspante, B., Rocchi, G., Sibio, A., Tilia, B., Tulli, R., Vellucci, M., Zannetti, D., Almaviva, S., Bagnato, F., Brolatti, G., Buscarino, A., Calacci, L., Caneve, L., Carlini, M., Colao, F., Corradino, C., Costa, P., Crescenzi, F., Cucchiaro, A., Ferro, G., Gabrielli, A., Galeani, S., Galperti, C., Gasior, P., Gospodarczyk, M., Jakubowski, L., Kubkowska, M., Lampasi, A., Lazic, V., Lubyako, L., Maffia, G., Martinelli, F., Martin-Solis, J. R., Maviglia, F., Mazzuca, R., Moneti, M., Orsitto, F. P., Palucci, A., Passeri, M., Popovic, Z., Possieri, C., Rabinski, M., Ratynskaia, S., Reale, M., Roccella, S., Sassano, M., Starace, F., Tolias, P., Vertkov, A., Zebrowski, J., Zito, P., Causa, F., and Buratti, P.

Subjects
Physics, Nuclear and High Energy Physics, Tokamak, Astrophysics::High Energy Astrophysical Phenomena, runaway electrons, Electron, plasma instabilities, Condensed Matter Physics, 01 natural sciences, 010305 fluids & plasmas, law.invention, plasma instabilitie, Cherenkov probe, Runaway electrons, law, Physics::Plasma Physics, 0103 physical sciences, Atomic physics, 010306 general physics, Cherenkov radiation, Communication channel
Abstract

The expulsion of runaway electrons (REs) during different types of tokamak instabilities is analysed by means of a Cherenkov probe inserted into the scrape-off layer of the FTU tokamak. One such type of instability, the well-known tearing mode, is involved in disruptive plasma termination events, during which the risk of RE avalanche multiplication is highest. The second type, known as anomalous Doppler instability, influences RE dynamics by enhancing pitch angle scattering. Three scenarios are analysed here, characterised by different RE generation rates and mechanisms. The main conclusions are drawn from correlations between the Cherenkov probe and other diagnostics. In particular, the Cherenkov probe permits the detection of fast electron expulsion with a high level of detail, presenting peaks with 100% signal contrast during tearing mode growth and rotation, and sub-peak structures reflecting the interplay between the magnetic island formed by the tearing mode, RE diffusion during island rotation and the geometry of obstacles in the vessel. Correlations between the Cherenkov signal, hard x-ray emission and electron cyclotron emission reveal the impulsive development of the anomalous Doppler instability with instability rise time in the microsecond scale resolved by the high time-resolution of the Cherenkov probe.

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11. Overview of the FTU results

Author

B. Tilia, D. Frigione, G. Maddaluno, David N. Wagner, C. Cianfarani, F. Belli, A. Grosso, Cristina Centioli, Mario Cavinato, V. Fusco, L. Panaccione, F. Colao, A. A. Tuccillo, E. Di Ferdinando, L. Jakubowski, M. Aquilini, Francesco Mirizzi, A. Milovanov, Sergio Briguglio, Gustavo Granucci, G. Ramogida, G. Calabrò, E. Giovannozzi, G. Pucella, Saul Garavaglia, D. Pacella, A. Pensa, D. Marocco, B. Angelini, L. Amicucci, Daniele Carnevale, M. De Angeli, V. Piergotti, F. Crescenzi, R. Tulli, A. Moro, A.V. Vertkov, A. Sibio, Karol Malinowski, Francesco Maviglia, D. Minelli, S. Nowak, Ocleto D'Arcangelo, B. Viola, Gregorio Vlad, Luca Boncagni, M. Lontano, G. L. Ravera, Duccio Testa, I.E. Lyublinski, C. Castaldo, E. Alessi, C. Di Troia, Marek J. Sadowski, M. Vellucci, J. Zebrowski, A. Bertocchi, G. Apruzzese, S. Almaviva, P. Petrolini, D. Ricci, Marco Riva, Daniela Farina, William Bin, Salvatore Podda, Carlo Sozzi, Jose Ramon Martin-Solis, A. Romano, B. Raspante, E. Lazzaro, M. Reale, F. Iannone, M. Marinucci, C. Mazzotta, R. De Angelis, Z. Popovic, A. Botrugno, M. Mosconi, J. X. Rossel, G. P. Canal, L. Federspiel, E. Vitale, D. Zannetti, C. Marchetto, M. Rabinski, A. Cardinali, Cristian Galperti, F. Orsitto, S. Di Giovenale, Luisa Caneve, G. Fogaccia, M. Zerbini, Giovanni Grosso, V. Cocilovo, Silvio Ceccuzzi, F. Crisanti, F. Causa, G. Mazzitelli, H. Reimerdes, R. Fantoni, M. Mezzacappa, Alessandro Bruschi, A. Pizzuto, M. Panella, E. Barbato, P. Cefali, G. Rocchi, B. Esposito, Mario Sassano, Sergio Galeani, G. Artaserse, Lorenzo Figini, Olivier Sauter, L. Gabellieri, O. Tudisco, R. Cesario, S. Roccella, A. N. Karpushov, V. Zanza, S. Cirant, B. P. Duval, V. Pericoli-Ridolfini, G. Giacomi, D. Kim, P. Buratti, V. Mellera, M.L. Apicella, Fulvio Zonca, Roccella, S., Riva, M., Reale, M., Fantoni, R., Crescenzi, F., Colao, F., Almaviva, S., Zannetti, D., Vellucci, M., Tulli, R., Tilia, B., Sibio, A., Rocchi, G., Raspante, B., Piergotti, V., Petrolini, P., Pensa, A., Mezzacappa, M., Grosso, A., Giacomi, G., Di Giovenale, S., Di Ferdinando, E., Cefali, P., Aquilini, M., Zonca, F., Zerbini, M., Zanza, V., Vlad, G., Vitale, E., Viola, B., Tudisco, O., Tuccillo, A. A., Romano, A., Ravera, G., Ramogida, G., Podda, S., Pizzuto, A., Panella, M., Pacella, D., Orsitto, F. P., Milovanov, A., Mazzotta, C., Mazzitelli, G., Marocco, D., Marinucci, M., Maddaluno, G., Iannone, F., Giovannozzi, E., Gabellieri, L., Fusco, V., Frigione, D., Fogaccia, G., Esposito, B., Di Troia, C., De Angelis, R., D'Arcangelo, O., Crisanti, F., Cocilovo, V., Cianfarani, C., Cesario, R., Centioli, C., Ceccuzzi, S., Causa, F., Castaldo, C., Cardinali, A., Calabró, G., Buratti, P., Briguglio, S., Botrugno, A., Boncagni, L., Bertocchi, A., Belli, F., Barbato, E., Artaserse, G., Apruzzese, G., Apicella, M. L., Angelini, B., Amicucci, L., and Pucella, G.

Subjects
FRASCATI TOKAMAK UPGRADE, Nuclear and High Energy Physics, Tokamak, Materials science, Nuclear engineering, Cyclotron, overview, CYCLOTRON CURRENT DRIVE, law.invention, Settore FIS/04 - Fisica Nucleare e Subnucleare, symbols.namesake, law, Physics::Plasma Physics, Limiter, Langmuir probe, CURRENT-DRIVE, tokamak, Magnetic confinement fusion, IMPROVED CONFINEMENT, Plasma, Condensed Matter Physics, PELLET INJECTION, Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin), TRANSPORT, LITHIUM LIMITER, PLASMAS, TOKAMAK, MODE, CONFINEMENT, FTU, INTERNAL TRANSPORT BARRIERS, ___, JOINT EUROPEAN TORUS, ____, symbols, CURRENT DRIVE EXPERIMENTS, LOWER-HYBRID WAVES, Plasma diagnostics, Electric current, Atomic physics
Abstract

Since the 2012 IAEA-FEC Conference, FTU operations have been largely devoted to runaway electrons generation and control, to the exploitation of the 140GHz electron cyclotron (EC) system and to liquid metal limiter elements. Experiments on runaway electrons have shown that the measured threshold electric field for their generation is larger than predicted by collisional theory and can be justified considering synchrotron radiation losses. A new runaway electrons control algorithm was developed and tested in presence of a runaway current plateau, allowing to minimize the interactions with plasma facing components and safely shut down the discharges. The experimental sessions with 140GHz EC system have been mainly devoted to experiments on real-time control of magnetohydrodynamic (MHD) instabilities using the new EC launcher with fast steering capability. Experiments with central EC injection have shown the onset of 3/2 and 2/1 tearing modes, while EC assisted breakdown experiments have been focused on ITER start-up issues, exploring the polarization conversion at reflection from inner wall and the capability to assure plasma start-up even in presence of a large stray magnetic field. A new actively cooled lithium limiter has been installed and tested. The lithium limiter was inserted in the scrape-off layer, without any damage to the limiter surface. First elongated FTU plasmas with EC additional heating were obtained with the new cooled limiter. Density peaking and controlled MHD activity driven by neon injection were investigated at different plasma parameters. A full real-time algorithm for disruption prediction, based on MHD activity signals from Mirnov coils, was developed exploiting a large database of disruptions. Reciprocating Langmuir probes were used to measure the heat flux e-folding length in the scrape-off layer, with the plasma kept to lay on thea internal limiter to resemble the ITER start-up phase. New diagnostics were successfully installed and tested, as a diamond probe to detect Cherenkov radiation produced by fast electrons and a gamma camera for runaway electrons studies. Laser induced breakdown spectroscopy measurements were performed under vacuum and with toroidal magnetic field, so demonstrating their capability to provide useful information on the surface elemental composition and fuel retention in present and future tokamaks, such as ITER. © 2015 EURATOM.

Published
2009

12. An overview of FTU results

Author

William Bin, G. Rocchi, Lorenzo Figini, G. Ramogida, Zwinglio Guimarães-Filho, Daniela Farina, C. Galperti, E. Giovannozzi, S. Nowak, D. Frigione, R. Tulli, H. Kroegler, A. Sibio, M. De Angeli, A. Krivska, S. Garavaglia, L. Di Matteo, M. Vellucci, F. Napoli, P. Petrolini, Sergio Briguglio, B. Angelini, Gregorio Vlad, B. Tilia, F. Gravanti, Giovanni Grossetti, G. Apruzzese, F. Belli, E. Di Ferdinando, Luca Boncagni, A. Cardinali, S. Di Giovenale, V Zanza, L. Gabellieri, G. Maddaluno, C. Di Troia, Gustavo Granucci, Silvio Ceccuzzi, E. Alessi, F. Iannone, G. Mazzitelli, M. Panella, A. Romano, B. Viola, G. Giacomi, Giovanni Grosso, V. Piergotti, G. Calabrò, A. Bertocchi, S. Podda, Gian Luca Ravera, C. Centioli, L. Amicucci, S. Cirant, C. Torelli, B. Raspante, Aldo Pizzuto, A. Grosso, V. Vitale, Angelo A. Tuccillo, O. D'Arcangelo, D. Pacella, V. Pericoli-Ridolfini, Alessandro Bruschi, E. Barbato, M. Zerbini, C. Castaldo, C. Marchetto, M. Marinucci, M. Mezzacappa, G. Pucella, A. Milovanov, M.L. Apicella, P. Cefali, M. Lontano, A. Botrugno, R. Cesario, C. Mazzotta, Carlo Sozzi, M. Aquilini, C. Cianfarani, A. Pensa, R. De Angelis, G.A. Moro, Francesco Mirizzi, E. Lazzaro, Daniele Marocco, D. Zannetti, V. Fusco, D. Minelli, O. Tudisco, G. Fogaccia, G. Artaserse, F. Crisanti, Fulvio Zonca, P. Buratti, Basilio Esposito, F.P. Orsitto, L. Panaccione, V. Mellera, Zannetti, D., Vellucci, M., Tulli, R., Torelli, C., Tilia, B., Sibio, A., Rocchi, G., Raspante, B., Piergotti, V., Petrolini, P., Pensa, A., Mezzacappa, M., Grosso, A., Gravanti, F., Giacomi, G., Di Giovenale, S., Di Ferdinando, E., Cefali, P., Aquilini, M., Zonca, F., Zerbini, M., Zanza, V., Vlad, G., Vitale, V., Viola, B., Tudisco, O., Tuccillo, A. A., Romano, A., Ravera, G., Ramogida, G., Pucella, G., Pizzuto, A., Podda, S., Pericoli-Ridolfini, V., Panella, M., Panaccione, L., Pacella, D., Orsitto, F. P., Mirizzi, F. C., Milovanov, A., Mazzotta, C., Mazzitelli, G., Marocco, D., Marinucci, M., Maddaluno, G., Kroegler, H., Krivska, A., Iannone, F., Giovannozzi, E., Gabellieri, L., Frigione, D., Fogaccia, G., Esposito, B., Di Troia, C., Di Matteo, L., De Angelis, R., Crisanti, F., Cirant, S., Cianfarani, C., Cesario, R., Centioli, C., Castaldo, C., Cardinali, A., Calabrò, G., Bruschi, A., Briguglio, S., Botrugno, A., DE ANGELIS, Riccardo, Calabro, G., Apicella, M. L., and Buratti, P.

Subjects
Physics, Nuclear and High Energy Physics, Safety factor, Cyclotron, Plasma, Sawtooth wave, Condensed Matter Physics, Electron cyclotron resonance, Computational physics, law.invention, Physics::Plasma Physics, Modulation, law, ____, Electric current, Doppler broadening
Abstract

Since the 2010 IAEA-FEC Conference, FTU has exploited improvements in cleaning procedures and in the density control system to complete a systematic exploration of access to high-density conditions in a wide range of plasma currents and magnetic fields. The line-averaged densities at the disruptive limit increased more than linearly with the toroidal field, while no dependence on plasma current was found; in fact, the maximum density of 4.3 × 10 20 m-3 was reached at B = 8 T even at the minimum current of 0.5 MA, corresponding to twice the Greenwald limit. The lack of plasma current dependence was due to the increase in density peaking with the safety factor. Experiments with the 140 GHz electron cyclotron resonance heating (ECRH) system were focused on the sawtooth (ST) period control and on the commissioning of a new launcher with real-time steering capability that will act as the front-end actuator of a real-time system for ST period control and tearing mode stabilization. Various ECRH and electron cyclotron current-drive modulation schemes were used; with the fastest one, the ST period synchronized with an 8 ms modulation period. The observed period variations were simulated using the JETTO code with a critical shear model for the crash trigger. The new launcher was of the plug-in type, allowing quick insertion and connection to the transmission line. Both beam characteristics and steering speed were in line with design expectation. Experimental results on the connection between improved coupling of lower hybrid waves in high-density plasmas and reduced wave spectral broadening were interpreted by fully kinetic, non-linear model calculations. A dual-frequency, time-of-flight diagnostic for the measurement of density profiles was developed and successfully tested. Fishbone-like instabilities driven by energetic electrons were simulated by the hybrid MHD-gyrokinetic XHMGC code. © 2013 IAEA, Vienna.

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