Author: "Spada E" / Topic: rfp - Searchworks@Jio Institute Digital Library Search Results

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35 results on '"Spada E"'

1. Self-organized helical equilibria as a new paradigm for ohmically heated fusion plasmas

Author: Lorenzini, R., Martines, E., Piovesan, P., Terranova, D., Zanca, P., Zuin, M., Alfier, A., Bonfiglio, D., Bonomo, F., Canton, A., Cappello, S., Carraro, L., Cavazzana, R., Escande, D. F., Fassina, A., Franz, P., Gobbin, M., Innocente, P., Marrelli, L., Pasqualotto, R., Puiatti, M. E., Spolaore, M., Valisa, M., Vianello, N., Martin, P., Apolloni, L., Adamek, J., Agostini, M., Annibaldi, S. V., Antoni, V., Auriemma, F., Barana, O., Baruzzo, M., Bettini, P., Bolzonella, T., Brombin, M., Brotankova, J., Buffa, A., Buratti, P., Cavinato, M., Chapman, B. E., Chitarin, G., Bello, S. D., Lorenzi, A. D., Masi, G. D., Ferro, A., Gaio, E., Gazza, E., Giudicotti, L., Gnesotto, F., Grando, L., Guazzotto, L., Guo, S. C., Igochine, V., Liu, Y. Q., Luchetta, A., Manduchi, G., Marchiori, G., Marcuzzi, D., Martini, S., McCollam, K., Milani, F., Moresco, M., Novello, L., Ortolani, S., Paccagnella, R., Peruzzo, S., Piovan, R., Piron, L., Pizzimenti, A., Pomaro, N., Predebon, I., Reusch, J. A., Rostagni, G., Rubinacci, G., Sarff, J. S., Sattin, F., Scarin, P., Serianni, G., Sonato, P., Spada, E., Soppelsa, A., Spagnolo, S., Spizzo, G., Taliercio, C., Toigo, V., Villone, F., White, R. B., Yadikin, D., Zaccaria, P., Zamengo, A., Zaniol, B., Zanotto, L., Zilli, E., Zohm, H., Zuin, M. Z., Lorenzini, R., Martines, E., Piovesan, P., Terranova, D., Zanca, P., Zuin, M., Alfier, A., Bonfiglio, D., Bonomo, F., Canton, A., Cappello, S., Carraro, L., Cavazzana, R., Escande, D. F., Fassina, A., Franz, P., Gobbin, M., Innocente, P., Marrelli, L., Pasqualotto, R., Puiatti, M. E., Spolaore, M., Valisa, M., Vianello, N., Martin, P., Apolloni, L., Adamek, J., Agostini, M., Annibaldi, S. V., Antoni, V., Auriemma, F., Barana, O., Baruzzo, M., Bettini, P., Bolzonella, T., Brombin, M., Brotankova, J., Buffa, A., Buratti, P., Cavinato, M., Chapman, B. E., Chitarin, G., Bello, S. D., Lorenzi, A. D., Masi, G. D., Ferro, A., Gaio, E., Gazza, E., Giudicotti, L., Gnesotto, F., Grando, L., Guazzotto, L., Guo, S. C., Igochine, V., Liu, Y. Q., Luchetta, A., Manduchi, G., Marchiori, G., Marcuzzi, D., Martini, S., Mccollam, K., Milani, F., Moresco, M., Novello, L., Ortolani, S., Paccagnella, R., Peruzzo, S., Piovan, R., Piron, L., Pizzimenti, A., Pomaro, N., Predebon, I., Reusch, J. A., Rostagni, G., Rubinacci, G., Sarff, J. S., Sattin, F., Scarin, P., Serianni, G., Sonato, P., Spada, E., Soppelsa, A., Spagnolo, S., Spizzo, G., Taliercio, C., Toigo, V., Villone, F., White, R. B., Yadikin, D., Zaccaria, P., Zamengo, A., Zaniol, B., Zanotto, L., Zilli, E., Zohm, H., Zuin, M. Z., Lorenzini, R, Martines, E, Piovesan, P, Terranova, D, Zanca, P, Zuin, M, Alfier, A, Bonfiglio, D, Bonomo, F, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Escande, D, Fassina, A, Franz, P, Gobbin, M, Innocente, P, Marrelli, L, Pasqualotto, R, Puiatti, M, Spolaore, M, Valisa, M, Vianello, N, and Martin, P
Subjects: Physics, quasi-single-helicity, Toroid, Tokamak, Fusion plasma, General Physics and Astronomy, Magnetic confinement fusion, reversed field pinch, Mechanics, Plasma, Fusion power, Instability, law.invention, Physics::Plasma Physics, law, RFP, Pinch, QSH, Atomic physics
Abstract: In the quest for new energy sources, the research on controlled thermonuclear fusion has been boosted by the start of the construction phase of the International Thermonuclear Experimental Reactor (ITER). ITER is based on the tokamak magnetic configuration, which is the best performing one in terms of energy confinement. Alternative concepts are however actively researched, which in the long term could be considered for a second generation of reactors. Here, we show results concerning one of these configurations, the reversed-field pinch (RFP). By increasing the plasma current, a spontaneous transition to a helical equilibrium occurs, with a change of magnetic topology. Partially conserved magnetic flux surfaces emerge within residual magnetic chaos, resulting in the onset of a transport barrier. This is a structural change and sheds new light on the potential of the RFP as the basis for a low-magnetic-field ohmic fusion reactor. © 2009 Macmillan Publishers Limited.
Published: 2009

2. First results on reversed field pinch plasmas with new magnetic boundary in the RFX-mod experiment

Author: Martini, S., Innocente, P., Agostini, M., Alfier, A., Antoni, V., Apolloni, L., Auriemma, F., Bagatin, M., Baker, W., Barana, O., Basso, F., Bettini, P., Bolzonella, T., Bonfiglio, D., Bonomo, F., Buffa, A., Canton, A., Cappello, S., Lorella Carraro, Cavazzana, R., Cavinato, M., Chitarin, G., Cravotta, A., Dal Bello, F. S., Dalla Palma, M., Lorenzi, A., Pasqual, L., Desideri, D., Escande, D. F., Franz, P., Gadani, G., Gaio, E., Garzotti, L., Gazza, E., Giudicotti, L., Gnesotto, F., Gobbin, M., Grando, L., Guo, S. C., Lorenzini, R., Luchetta, A., Malesani, G., Manduchi, G., Marchiori, G., Marcuzzi, D., Marrelli, L., Martin, P., Martines, E., Masiello, A., Milani, F., Moresco, M., Murari, A., Nielsen, P., Ortolani, S., Paccagnella, R., Pasqualotto, R., Peruzzo, S., Piovan, R., Piovesan, P., Predebon, I., Pomaro, N., Puiatti, M. E., Rostagni, G., Sattin, F., Scarin, P., Schmidt, V., Serianni, G., Sonato, P., Spada, E., Spizzo, G., Spolaore, M., Taccon, C., Taliercio, C., Terranova, D., Toigo, V., Valisa, M., Vianello, N., Zaccaria, P., Zanca, P., Zaniol, B., Zanotto, L., Zilli, E., Zollino, G., Zuin, M., Martini, S, Innocente, P, Agostini, M, Alfier, A, Antoni, V, Apolloni, L, Auriemma, F, Bagatin, M, Baker, W, Barana, O, Basso, F, Bettini, P, Bolzonella, T, Bonfiglio, D, Bonomo, F, Buffa, A, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Cavinato, M, Chitarin, G, Cravotta, A, Dal Bello, F, Dalla Palma, M, De Lorenzi, A, De Pasqual, L, Desideri, D, Escande, D, Franz, P, Gadani, G, Gaio, E, Garzotti, L, Gazza, E, Giudicotti, L, Gnesotto, F, Gobbin, M, Grando, L, Guo, S, Lorenzini, R, Luchetta, A, Malesani, G, Manduchi, G, Marchiori, G, Marcuzzi, D, Marrelli, L, Martin, P, Martines, E, Masiello, A, Milani, F, Moresco, M, Murari, A, Nielsen, P, Ortolani, S, Paccagnella, R, Pasqualotto, R, Peruzzo, S, Piovan, R, Piovesan, P, Predebon, I, Pomaro, N, Puiatti, M, Rostagni, G, Sattin, F, Scarin, P, Schmidt, V, Serianni, G, Sonato, P, Spada, E, Spizzo, G, Spolaore, M, Taccon, C, Taliercio, C, Terranova, D, Toigo, V, Valisa, M, Vianello, N, Zaccaria, P, Zanca, P, Zaniol, B, Zanotto, L, Zilli, E, Zollino, G, and Zuin, M
Subjects: RFX-mod, RFP, reversed field pinch
Published: 2005

3. Turbulence and plasma flow self-organization in a reversed field pinch configuration

Author: Vianello N, Spada E, Antoni V, Spolaore M, Serianni G, Regnoli G, Cavazzana R, Martines E, Bergsåker H, Drake JR, Vianello, N, Spada, E, Antoni, V, Spolaore, M, Serianni, G, Regnoli, G, Cavazzana, R, Martines, E, Bergsåker, H, and Drake, J
Subjects: plasma turbulence, plasma flow, RFP, reversed field pinch
Published: 2004

4. Features of electrostatic structures in Reversed Field Pinch edge region

Author: Spolaore M, Antoni V, Bergsåker H, Cavazzana R, Drake J, Martines E, Regnoli G, Serianni G, Spada E, Vianello N, Spolaore, M, Antoni, V, Bergsåker, H, Cavazzana, R, Drake, J, Martines, E, Regnoli, G, Serianni, G, Spada, E, and Vianello, N
Subjects: T2, plasma turbulence, coherent structures, RFP, reversed field pinch, RFX
Published: 2003

5. Intermittent events and electrostatic structures in the edge region of reversed field pinch experiments

Author: Spolaore M, Antoni V, Bergsåker H, Cavazzana R, Drake J, Martines E, Regnoli G, Serianni G, Spada E, Vianello N, Spolaore, M, Antoni, V, Bergsåker, H, Cavazzana, R, Drake, J, Martines, E, Regnoli, G, Serianni, G, Spada, E, and Vianello, N
Subjects: plasma turbulence, intermittency, RFP, reversed field pinch, RFX
Published: 2002

6. Bursty fluctuation events in magnetically confined plasmas: avalanche-like SOC processes or MHD turbulence?

Author: Antoni V, Carbone V, Cavazzana R, Fattorini L, Martines E, Regnoli G, Serianni G, Spada E, Spolaore M, Tramontin L, Vianello N, Antoni, V, Carbone, V, Cavazzana, R, Fattorini, L, Martines, E, Regnoli, G, Serianni, G, Spada, E, Spolaore, M, Tramontin, L, and Vianello, N
Subjects: RFP, SOC, reversed field pinch, self-organized criticality, RFX
Published: 2001

7. Status of the RFX experiment

Author: Antoni, V., Apolloni, L., Bagatin, M., Baker, W., Bartiromo, R., Bassan, M., Bellina, F., Bettini, P., Bilato, R., Bolzonella, T., Buffa, A., Campostrini, P., Cappello, S., Carraro, L., Casarotto, E., Cavazzana, R., Chino, F., Chitarin, G., Costa, S., Lorenzi, A., Desideri, D., Fiorentin, P., Gaio, E., Garzotti, L., Giudicotti, L., Gnesotto, F., Guarnieri, M., Guo, S., Hemming, O., Innocente, P., Luchetta, A., Malesani, G., Manduchi, G., Marchiori, G., Lionello Marrelli, Martin, P., Martines, E., Martini, S., Maschio, A., Masiello, A., Moresco, M., Murari, A., O Leary, P., Paccagnella, R., Pasqualotto, R., Peruzzo, S., Piovan, R., Pomaro, N., Pugno, R., Puiatti, Me, Rostagni, G., Sardella, A., Sattin, F., Scarin, P., Serianni, G., Sonato, P., Spada, E., Stella, A., Taliercio, C., Toigo, V., Tramontin, L., Trevisan, F., Valisa, M., Vitturi, S., Yagi, Y., Zaccaria, P., Zilli, E., Zollino, G., Antoni, V, Apolloni, L, Bagatin, M, Baker, W, Bartiromo, R, Bassan, M, Bellina, F, Bettini, P, Bilato, R, Bolzonella, T, Buffa, A, Campostrini, P, Cappello, S, Carraro, L, Casarotto, E, Cavazzana, R, Chino, F, Chitarin, G, Costa, S, De Lorenzi, A, Desideri, D, Fiorentin, P, Gaio, E, Garzotti, L, Giudicotti, L, Gnesotto, F, Guarnieri, M, Guo, S, Hemming, O, Innocente, P, Lucchetta, A, Malesani, G, Manduchi, G, Marchiori, G, Marrelli, L, Martin, P, Martines, E, Martini, S, Maschio, A, Masiello, A, Moresco, M, Murari, A, O'Leary, P, Paccagnella, R, Pasqualotto, R, Peruzzo, S, Piovan, R, Pomaro, N, Pugno, R, Puiatti, M, Rostagni, G, Sardella, A, Sattin, F, Scarin, P, Serianni, G, Sonato, P, Spada, E, Stella, A, Taliercio, C, Toigo, V, Tramontin, L, Trevisan, F, Valisa, M, Vitturi, S, Yagi, Y, Zaccaria, P, Zilli, E, and Zollino, G
Subjects: Physics::Plasma Physics, RFP, reversed field pinch, RFX
Abstract: The first results obtained in the RFX reversed field pinch experiment after the 1995 machine modifications are reported. The confinement, for fully stationary discharges at 0.6 MA, has now reached the expected values, even in the presence of MHD wall locked modes. Studies on locked mode effects have evidenced currents flowing from the plasma into the vessel in the region of locking. Measurements on plasma rotation and radial electric field have shown a perpendicular velocity shear at the edge similar to what is found in tokamaks and stellarators. New measurements on edge superthermal electrons and some evidence of their correlation with plasma core characteristics are included.
Published: 1997

8. Electrostatic and magnetic structures in the edge region of RFX-mod experiment

Author: Spolaore, M., Vianello, N., Cavazzana, R., Emilio Martines, Serianni, G., Spada, E., Zuin, M., Scarin, P., Agostini, M., Antoni, V., Spolaore, M, Vianello, N, Cavazzana, R, Martines, E, Serianni, G, Spada, E, Zuin, M, Scarin, P, Agostini, M, and Antoni, V
Subjects: RFX-mod, plasma turbulence, RFP, reversed field pinch

9. Turbulent energy transfer in the RFX-Mod device

Author: Vianello, N., Spada, E., Cavazzana, R., Martines, E., Serianni, G., Spolaore, M., Zuin, M., vanni antoni, Vianello, N, Spada, E, Cavazzana, R, Martines, E, Serianni, G, Spolaore, M, Zuin, M, and Antoni, V
Subjects: RFX-mod, plasma turbulence, RFP, reversed field pinch

10. Fast dynamics of relaxation event in RFX-mod

Author: Zuin, M., Vianello, N., Spolaore, M., Bolzonella, T., Cavazzana, R., Martines, E., David Terranova, Serianni, G., Spada, E., Antoni, V., Zuin, M, Vianello, N, Spolaore, M, Bolzonella, T, Cavazzana, R, Martines, E, Terranova, D, Serianni, G, Spada, E, and Antoni, V
Subjects: RFX-mod, MHD, RFP, relaxation events, reversed field pinch

11. Characterisation of the edge region of the RFX-mod device

Author: Serianni, G., Vianello, N., Cavazzana, R., Emilio Martines, Spada, E., Spolaore, M., Zuin, M., Agostini, M., Scarin, P., Antoni, V., Serianni, G, Vianello, N, Cavazzana, R, Martines, E, Spada, E, Spolaore, M, Zuin, M, Agostini, M, Scarin, P, and Antoni, V
Subjects: edge region, RFX-mod, RFP, reversed field pinch

12. Overview of the RFX fusion science program

Author: M. Gobbin, Roberto Pasqualotto, D. Bonfiglio, Enrico Zilli, Giuseppe Marchiori, Piero Martin, S. Martini, Fulvio Auriemma, E. Gazza, D.K. Mansfield, P. Zaccaria, Piergiorgio Sonato, S. Ortolani, Wolf-Dieter Schneider, D. Yadikin, Stefano Munaretto, L. Piron, M. Valisa, Fabio Sattin, Susanna Cappello, G. V. Perverezev, F. Milani, Roberto Paccagnella, Paolo Bettini, S. Fiameni, Roscoe White, A. Ruzzon, V. Antoni, Leonardo Giudicotti, Yueqiang Liu, Lionello Marrelli, Nicola Vianello, S. Dal Bello, A. Scaggion, V. Rigato, Fabio Villone, A. Zamengo, Federica Bonomo, R. Cavazzana, M. Baruzzo, L. Carraro, F. Fantini, Giuseppe Zollino, Barbara Zaniol, Rita Lorenzini, Luis Chacon, X. Garbet, C. Angioni, Andrea Rizzolo, G. De Masi, G. Rostagni, W. A. Cooper, Manabu Takechi, Piero Agostinetti, Paolo Scarin, A. Pizzimenti, Yongkyoon In, Sheena Menmuir, Silvia Spagnolo, M. Moresco, Satoru Kiyama, S. P. Hirshman, M. Okabayashi, Giuseppe Chitarin, S. C. Guo, Gabriele Manduchi, Dominique Escande, Gianluigi Serianni, Alessandro Fassina, Luca Grando, Simona Barison, Allen H. Boozer, Michael Drevlak, Diego Marcuzzi, M. Pavei, J.Q. Dong, Anton Soppelsa, B. Momo, Gianluca Spizzo, Hajime Sakakita, Neil Pomphrey, Shunsuke Ide, Donald A. Spong, J. S. Sarff, Alessandra Canton, D. Lopez Bruna, M. Brombin, Matteo Zuin, T. Bolzonella, R. Piovan, Songfen Liu, Alberto Ferro, Italo Predebon, V. Igochine, L. Zanotto, Simone Peruzzo, Elena Gaio, P. Piovesan, Cesare Taliercio, J. Adamek, Go Matsunaga, P. Zanca, A. Buffa, M. Veranda, N. Pomaro, M. Spolaore, Oliviero Barana, Francesco Gnesotto, Emilio Martines, M. Dalla Palma, Paolo Franz, David Terranova, Yoichi Hirano, Matteo Agostini, G. Mazzitelli, Alberto Alfier, L. Novello, Vanni Toigo, M. Boldrin, R. Delogu, Guglielmo Rubinacci, Maria Ester Puiatti, A. Fiorentin, Karsten McCollam, E. Spada, M. Cavinato, A. De Lorenzi, L. Apolloni, J. Brotankova, F. Fellin, P. Innocente, Raul Sanchez, Zhirui Wang, Adriano Luchetta, Martin, P, Adamek, J, Agostinetti, P, Agostini, M, Alfier, A, Angioni, C, Antoni, V, Apolloni, L, Auriemma, F, Barana, O, Barison, S, Baruzzo, M, Bettini, P, Boldrin, M, Bolzonella, T, Bonfiglio, D, Bonomo, F, Boozer, A, Brombin, M, Brotankova, J, Buffa, A, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Cavinato, M, Chacon, L, Chitarin, G, Cooper, W, Dal Bello, S, Dalla Palma, M, Delogu, R, De Lorenzi, A, De Masi, G, Dong, J, Drevlak, M, Escande, D, Fantini, F, Fassina, A, Fellin, F, Ferro, A, Fiameni, S, Fiorentin, A, Franz, P, Gaio, E, Garbet, X, Gazza, E, Giudicotti, L, Gnesotto, F, Gobbin, M, Grando, L, Guo, S, Hirano, Y, Hirshman, S, Ide, S, Igochine, V, In, Y, Innocente, P, Kiyama, S, Liu, S, Liu, Y, Bruna, D, Lorenzini, R, Luchetta, A, Manduchi, G, Mansfield, D, Marchiori, G, Marcuzzi, D, Marrelli, L, Martini, S, Matsunaga, G, Martines, E, Mazzitelli, G, Mccollam, K, Menmuir, S, Milani, F, Momo, B, Moresco, M, Munaretto, S, Novello, L, Okabayashi, M, Ortolani, S, Paccagnella, R, Pasqualotto, R, Pavei, M, Perverezev, G, Peruzzo, S, Piovan, R, Piovesan, P, Piron, L, Pizzimenti, A, Pomaro, N, Pomphrey, N, Predebon, I, Puiatti, M, Rigato, V, Rizzolo, A, Rostagni, G, Rubinacci, G, Ruzzon, A, Sakakita, H, Sanchez, R, Sarff, J, Sattin, F, Scaggion, A, Scarin, P, Schneider, W, Serianni, G, Sonato, P, Spada, E, Soppelsa, A, Spagnolo, S, Spolaore, M, Spong, D, Spizzo, G, Takechi, M, Taliercio, C, Terranova, D, Toigo, V, Valisa, M, Veranda, M, Vianello, N, Villone, F, Wang, Z, White, R, Yadikin, D, Zaccaria, P, Zamengo, A, Zanca, P, Zaniol, B, Zanotto, L, Zilli, E, Zollino, G, Zuin, M, Martin, P., Adamek, J., Agostinetti, P., Agostini, M., Alfier, A., Angioni, C., Antoni, V., Apolloni, L., Auriemma, F., Barana, O., Barison, S., Baruzzo, M., Bettini, P., Boldrin, M., Bolzonella, T., Bonfiglio, D., Bonomo, F., Boozer, A. H., Brombin, M., Brotankova, J., Buffa, A., Canton, A., Cappello, S., Carraro, L., Cavazzana, R., Cavinato, M., Chacon, L., Chitarin, G., Cooper, W. A., Bello, S. D., Palma, M. D., Delogu, R., Lorenzi, A. D., Masi, G. D., Dong, J. Q., Drevlak, M., Escande, D. F., Fantini, F., Fassina, A., Fellin, F., Ferro, A., Fiameni, S., Fiorentin, A., Franz, P., Gaio, E., Garbet, X., Gazza, E., Giudicotti, L., Gnesotto, F., Gobbin, M., Grando, L., Guo, S. C., Hirano, Y., Hirshman, S. P., Ide, S., Igochine, V., In, Y., Innocente, P., Kiyama, S., Liu, S. F., Liu, Y. Q., Bruna, D. L., Lorenzini, R., Luchetta, A., Manduchi, G., Mansfield, D. K., Marchiori, G., Marcuzzi, D., Marrelli, L., Martini, S., Matsunaga, G., Martines, E., Mazzitelli, G., Mccollam, K., Menmuir, S., Milani, F., Momo, B., Moresco, M., Munaretto, S., Novello, L., Okabayashi, M., Ortolani, S., Paccagnella, R., Pasqualotto, R., Pavei, M., Perverezev, G. V., Peruzzo, S., Piovan, R., Piovesan, P., Piron, L., Pizzimenti, A., Pomaro, N., Pomphrey, N., Predebon, I., Puiatti, M. E., Rigato, V., Rizzolo, A., Rostagni, G., Rubinacci, Guglielmo, Ruzzon, A., Sakakita, H., Sanchez, R., Sarff, J. S., Sattin, F., Scaggion, A., Scarin, P., Schneider, W., Serianni, G., Sonato, P., Spada, E., Soppelsa, A., Spagnolo, S., Spolaore, M., Spong, D. A., Spizzo, G., Takechi, M., Taliercio, C., Terranova, D., Toigo, V., Valisa, M., Veranda, M., Vianello, N., Villone, F., Wang, Z., White, R. B., Yadikin, D., Zaccaria, P., Zamengo, A., Zanca, P., Zaniol, B., Zanotto, L., Zilli, E., Zollino, G., and Zuin, M.
Subjects: Nuclear and High Energy Physics, RFX-mod, Tokamak, Nuclear engineering, PLASMAS, CONFINEMENT, reversed field pinch, magnetic confinement, law.invention, law, Physics::Plasma Physics, RFP, Scaling, Mod, Physics, Reversed field pinch, STABILITY, Magnetic confinement fusion, INTERNAL TRANSPORT BARRIER, Plasma, Fusion power, Condensed Matter Physics, REVERSED-FIELD-PINCH, Atomic physics, Magnetohydrodynamics, Stellarator
Abstract: This paper summarizes the main achievements of the RFX fusion science program in the period between the 2008 and 2010 IAEA Fusion Energy Conferences. RFX-mod is the largest reversed field pinch in the world, equipped with a system of 192 coils for active control of MHD stability. The discovery and understanding of helical states with electron internal transport barriers and core electron temperature >1.5 keV significantly advances the perspectives of the configuration. Optimized experiments with plasma current up to 1.8 MA have been realized, confirming positive scaling. The first evidence of edge transport barriers is presented. Progress has been made also in the control of first-wall properties and of density profiles, with initial first-wall lithization experiments. Micro-turbulence mechanisms such as ion temperature gradient and micro-tearing are discussed in the framework of understanding gradient-driven transport in low magnetic chaos helical regimes. Both tearing mode and resistive wall mode active control have been optimized and experimental data have been used to benchmark numerical codes. The RFX programme also provides important results for the fusion community and in particular for tokamaks and stellarators on feedback control of MHD stability and on three-dimensional physics. On the latter topic, the result of the application of stellarator codes to describe three-dimensional reversed field pinch physics will be presented. © 2011 IAEA, Vienna.
Published: 2011

13. Overview of RFX-mod results

Author: R. Paccagnella, Cesare Taliercio, J. Adamek, V. Antoni, A. Pizzimenti, Gianluca Spizzo, Gabriele Manduchi, E. Spada, Vanni Toigo, D. Terranova, Alberto Ferro, N. Pomaro, P. Zaccaria, Rita Lorenzini, B. E. Chapman, Piero Martin, L. Guazzotto, A. Zamengo, Simone Peruzzo, Elena Gaio, Italo Predebon, V. Igochine, F. Milani, M. Spolaore, Oliviero Barana, Francesco Gnesotto, Alessandro Fassina, Giuseppe Marchiori, E. Gazza, G. Serianni, L. Zanotto, Piergiorgio Sonato, L. Piron, A. De Lorenzi, Diego Marcuzzi, Alessandra Canton, Matteo Zuin, T. Bolzonella, Federica Bonomo, Fabio Villone, M. Valisa, S. Cappello, H. Zohm, R. Cavazzana, J. Brotankova, Maria Ester Puiatti, M. Gobbin, P. Scarin, P. Zanca, Silvia Spagnolo, M. Baruzzo, Lionello Marrelli, Fabio Sattin, A. Buffa, Nicola Vianello, Fulvio Auriemma, Karsten McCollam, S. Ortolani, J. S. Sarff, S. Dal Bello, M. Cavinato, Paolo Bettini, P. Piovesan, G. Rostagni, P. Innocente, P. Buratti, M. Moresco, Roscoe White, Leonardo Giudicotti, Anton Soppelsa, Guglielmo Rubinacci, Sheena Menmuir, Emilio Martines, Paolo Franz, L. Carraro, D. Bonfiglio, Enrico Zilli, S. Martini, G. De Masi, L. Apolloni, Giuseppe Chitarin, M. Brombin, R. Piovan, Matteo Agostini, J.A. Reusch, Barbara Zaniol, Yueqiang Liu, S. C. Guo, Dominique Escande, S.V. Annibaldi, Alberto Alfier, L. Novello, Luca Grando, Adriano Luchetta, Roberto Pasqualotto, D. Yadikin, Martin, P, Apolloni, L, Puiatti, M, Adamek, J, Agostini, M, Alfier, A, Annibaldi, S, Antoni, V, Auriemma, F, Barana, O, Baruzzo, M, Bettini, P, Bolzonella, T, Bonfiglio, D, Bonomo, F, Brombin, M, Brotankova, J, Buffa, A, Buratti, P, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Cavinato, M, Chapman, B, Chitarin, G, Dal Bello, S, De Lorenzi, A, De Masi, G, Escande, D, Fassina, A, Ferro, A, Franz, P, Gaio, E, Gazza, E, Giudicotti, L, Gnesotto, F, Gobbin, M, Grando, L, Guazzotto, L, Guo, S, Igochine, V, Innocente, P, Liu, Y, Lorenzini, R, Luchetta, A, Manduchi, G, Marchiori, G, Marcuzzi, D, Marrelli, L, Martini, S, Martines, E, Mccollam, K, Menmuir, S, Milani, F, Moresco, M, Novello, L, Ortolani, S, Paccagnella, R, Pasqualotto, R, Peruzzo, S, Piovan, R, Piovesan, P, Piron, L, Pizzimenti, A, Pomaro, N, Predebon, I, Reusch, J, Rostagni, G, Rubinacci, G, Sarff, J, Sattin, F, Scarin, P, Serianni, G, Sonato, P, Spada, E, Soppelsa, A, Spagnolo, S, Spolaore, M, Spizzo, G, Taliercio, C, Terranova, D, Toigo, V, Valisa, M, Vianello, N, Villone, F, White, R, Yadikin, D, Zaccaria, P, Zamengo, A, Zanca, P, Zaniol, B, Zanotto, L, Zilli, E, Zohm, H, Zuin, M, Martin, P., Apolloni, L., Puiatti, M. E., Adamek, J., Agostini, M., Alfier, A., Annibaldi, S. V., Antoni, V., Auriemma, F., Barana, O., Baruzzo, M., Bettini, P., Bolzonella, T., Bonfiglio, D., Bonomo, F., Brombin, M., Brotankova, J., Buffa, A., Buratti, P., Canton, A., Cappello, S., Carraro, L., Cavazzana, R., Cavinato, M., Chapman, B. E., Chitarin, G., Dal Bello, S., De Lorenzi, A., De Masi, G., Escande, D. F., Fassina, A., Ferro, A., Franz, P., Gaio, E., Gazza, E., Giudicotti, L., Gnesotto, F., Gobbin, M., Grando, L., Guazzotto, L., Guo, S. C., Igochine, V., Innocente, P., Liu, Y. Q., Lorenzini, R., Luchetta, A., Manduchi, G., Marchiori, G., Marcuzzi, D., Marrelli, L., Martini, S., Martines, E., Mccollam, K., Menmuir, S., Milani, F., Moresco, M., Novello, L., Ortolani, S., Paccagnella, R., Pasqualotto, R., Peruzzo, S., Piovan, R., Piovesan, P., Piron, L., Pizzimenti, A., Pomaro, N., Predebon, I., Reusch, J. A., Rostagni, G., Rubinacci, Guglielmo, Sarff, J. S., Sattin, F., Scarin, P., Serianni, G., Sonato, P., Spada, E., Soppelsa, A., Spagnolo, S., Spolaore, M., Spizzo, G., Taliercio, C., Terranova, D., Toigo, V., Valisa, M., Vianello, N., Villone, F., White, R. B., Yadikin, D., Zaccaria, P., Zamengo, A., Zanca, P., Zaniol, B., Zanotto, L., Zilli, E., Zohm, H., and Zuin, M.
Subjects: Physics, Nuclear and High Energy Physics, Leading edge, Tokamak, RFX-mod, Reversed field pinch, MHD, magnetic confinement, Magnetic confinement fusion, reversed field pinch, Fusion power, Condensed Matter Physics, TRANSPORT, law.invention, LUNDQUIST NUMBER, Nuclear physics, REVERSED-FIELD-PINCH, EDGE, law, RFP, Electron temperature, Magnetohydrodynamics, Plasma stability
Abstract: With the exploration of the MA plasma current regime in up to 0.5 s long discharges, RFX-mod has opened new and very promising perspectives for the reversed field pinch (RFP) magnetic configuration, and has made significant progress in understanding and improving confinement and in controlling plasma stability. A big leap with respect to previous knowledge and expectations on RFP physics and performance has been made by RFX-mod since the last 2006 IAEA Fusion Energy Conference. A new self-organized helical equilibrium has been experimentally achieved (the Single Helical Axis - SHAx - state), which is the preferred state at high current. Strong core electron transport barriers characterize this regime, with electron temperature gradients comparable to those achieved in tokamaks, and by a factor of 4 improvement in confinement time with respect to the standard RFP. RFX-mod is also providing leading edge results on real-time feedback control of MHD instabilities, of general interest for the fusion community. © 2009 IAEA, Vienna.
Published: 2009

14. Active MHD control at high currents in RFX-mod

Author: Emilio Martines, Lorella Carraro, A. Pizzimenti, D. Terranova, Paolo Franz, M. Brombin, P. Zaccaria, Rita Lorenzini, V. Antoni, E. Spada, Mario Cavinato, Roberto Cavazzana, S. Cappello, G. Rostagni, F. Milani, Paolo Zanca, L. Apolloni, N. Vianello, Vanni Toigo, L. Zanotto, C. Taliercio, N. Pomaro, Gianluca Spizzo, Giuseppe Zollino, Giuseppe Chitarin, C. Taccon, Barbara Zaniol, Federica Bonomo, A. Murari, A. De Lorenzi, Alessandra Canton, Matteo Zuin, Fulvio Auriemma, L. Garzotti, S. Ortolani, R. Paccagnella, S. C. Guo, Anton Soppelsa, Maria Ester Puiatti, Lionello Marrelli, Tommaso Bolzonella, Gabriele Manduchi, F. Sattin, S. Martini, Alessandro Fassina, G. Malesani, Luca Grando, P. Innocente, Giuseppe Marchiori, P. Piovesan, C. Alessi, D. F. Escande, Roberto Pasqualotto, L. De Pasqual, D. Bonfiglio, M. Valisa, Enrico Zilli, A. Cravotta, Paolo Bettini, A. Masiello, Matteo Agostini, R. Piovan, Diego Marcuzzi, G. Gadani, Piergiorgio Sonato, Alberto Alfier, L. Novello, Simone Peruzzo, Elena Gaio, S. Dal Bello, M. Spolaore, Piero Martin, E. Gazza, Francesco Gnesotto, Adriano Luchetta, Leonardo Giudicotti, P. Scarin, A. Buffa, Marco Gobbin, M. Moresco, G. Serianni, Martini, S, Agostini, M, Alessi, C, Alfier, A, Antoni, V, Apolloni, L, Auriemma, F, Bettini, P, Bolzonella, T, Bonfiglio, D, Bonomo, F, Brombin, M, Buffa, A, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Cavinato, M, Chitarin, G, Cravotta, A, Dal Bello, S, De Lorenzi, A, De Pasqual, L, Escande, D, Fassina, A, Franz, P, Gadani, G, Gaio, E, Garzotti, L, Gazza, E, Giudicotti, L, Gnesotto, F, Gobbin, M, Grando, L, Guo, S, Innocente, P, Lorenzini, R, Luchetta, A, Malesani, G, Manduchi, G, Marchiori, G, Marcuzzi, D, Marrelli, L, Martin, P, Martines, E, Masiello, A, Milani, F, Moresco, M, Murari, A, Novello, L, Ortolani, S, Paccagnella, R, Pasqualotto, R, Peruzzo, S, Piovan, R, Piovesan, P, Pizzimenti, A, Pomaro, N, Puiatti, M, Rostagni, G, Sattin, F, Scarin, P, Serianni, G, Sonato, P, Spada, E, Soppelsa, A, Spizzo, G, Spolaore, M, Taccon, C, Taliercio, C, Terranova, D, Toigo, V, Valisa, M, Vianello, N, Zaccaria, P, Zanca, P, Zaniol, B, Zanotto, L, Zilli, E, Zollino, G, and Zuin, M
Subjects: Physics, Nuclear and High Energy Physics, RFX-mod, Toroid, business.industry, Pulse duration, reversed field pinch, Plasma, Mechanics, Condensed Matter Physics, MHD control, Amplitude, Optics, Physics::Plasma Physics, RFP, Pinch, Magnetohydrodynamics, business, Voltage, Dynamo
Abstract: The modified RFX is a very flexible device used for a variety of control schemes for MHD instabilities and for advanced reverse field pinch scenarios. Relative to the previous machine, RFX-mod has a thin Cu shell with vertical field penetration time τS, lowered from 450 to 50 ms and shell/plasma proximity from b/a ≤ 1.24-1.1. Toroidal equilibrium is feedback-controlled and new power supplies provide better Bφ control. Newly designed graphite tiles protect the vessel from localized power deposition. A mesh of 192 external saddle coils, supervised by a digital feedback system, controls radial fields due to field errors and MHD modes. The paper presents an overview of the very encouraging results obtained using both new and 'standard' advanced operational modes in the current range 0.3-1 MA. A dramatic improvement of plasma performance was obtained by using the saddle coils to cancel all the radial field components, an operation mode dubbed virtual shell (VS). The toroidal voltage was lowered by more than 25% and the pulse length was tripled, up to 7 times the τS. Steady-state RFP pulses are now limited only by the applied volt-seconds. The improved magnetic boundary also has an effect on the tearing modes underlying the sustainment of the RFP, whose core amplitude is more than halved. The VS combined with new schemes for the active rotation of the MHD dynamo modes has allowed us to obtain reliable and well-controlled long RFP pulses in the MA current range. This results in a 100% increase in the particle and energy confinement time relative to the previous experiment and opens the possibility of exploring the machine performance in the 2 MA design range. © 2007 IAEA.
Published: 2007

15. Coherent structures and anomalous transport in reversed field pinch plasmas

Author: Marco Cecconello, Nicola Vianello, Gianluigi Serianni, V. Antoni, Emilio Martines, James R. Drake, Henric Bergsåker, Roberto Cavazzana, M. Spolaore, E. Spada, Antoni, V, Drake, J, Spada, E, Spolaore, M, Vianello, N, Bergsaker, H, Cavazzana, R, Cecconello, M, Martines, E, and Serianni, G
Subjects: Physics, Reversed field pinch, Turbulence, business.industry, EXTRAP-T2R, Edge region, coherent structure, Plasma, Condensed Matter Physics, reversed field pingh, Atomic and Molecular Physics, and Optics, Computational physics, Optics, plasma turbulence, RFP, Lagrangian coherent structures, business, Mathematical Physics, RFX
Abstract: The results leading to the identification of coherent structures emerging from the background turbulence in the edge region of the reversed field pinch experiments EXTRAP-T2R and RFX are reviewed. These structures have traits of vortices in velocity field and blobs in density, and the reconstruction of their spatial structure and of their time evolution is discussed focusing on the analysis tools applied. The role of these structures in the particle anomalous transport is addressed, showing that their collisions can contribute up to 50% the total particle losses.This process is shown to be responsible for bursts in particle flux and it is found to set a characteristic collision time, which is in agreement with the statistical properties of laminar times for particle flux bursts. © 2006 The Royal Swedish Academy of Sciences.
Published: 2006

16. Search of Self-Organized Criticality Processes in Magnetically Confined Plasmas: Hints from the Reversed Field Pinch Configuration

Author: N. Vianello, Emilio Martines, G. Regnoli, L. Fattorini, L. Tramontin, M. Spolaore, Gianluigi Serianni, Roberto Cavazzana, E. Spada, Vincenzo Carbone, V. Antoni, Spada, E, Carbone, V, Cavazzana, R, Fattorini, L, Regnoli, G, Vianello, N, Antoni, V, Martines, E, Serianni, G, Spolaore, M, and Tramontin, L
Subjects: Novel technique, Physics, Condensed matter physics, Reversed field pinch, plasma physics, Gaussian, turbulence, General Physics and Astronomy, Probability density function, reversed field pinch, Plasma, Self-organized criticality, Computational physics, Microwave reflectometry, symbols.namesake, Criticality, Physics::Plasma Physics, transport, RFP, symbols, Nuclear fusion, SOC, self-organized criticality, non linear dynamics
Abstract: In order to test the self-organized criticality (SOC) paradigm in transport processes, a novel technique has been applied for the first time to plasmas confined in reversed field pinch configuration. This technique consists of an analysis of the probability distribution function of the times between bursts in density fluctuations measured by microwave reflectometry and electrostatic probes. The same analysis has also been applied to intermittent events sorted out from the Gaussian background. In both cases, the experimental results disagree with the predictions for a SOC system.
Published: 2001

17. Confinement studies on RFX

Author: Paolo Scarin, P. Zaccaria, S. Costa, P. Kusstatscher, Piero Martin, Roberto Paccagnella, Piergiorgio Sonato, Giuseppe Chitarin, Pietro Fiorentin, G. Malesani, Enrico Zilli, G. Rostagni, P. O'Leary, Lorella Carraro, S. Martini, M. Bassan, Giuseppe Zollino, Vanni Toigo, Andrea Murari, S. Vitturi, Francesco Trevisan, Maria Ester Puiatti, Andrea Stella, Gabriele Manduchi, M. Moresco, Mario Bagatin, Gianluigi Serianni, Leonardo Giudicotti, A. Buffa, Paolo Innocente, E. Spada, L. Benfatto, Giuseppe Marchiori, R. Guatieri, Emilio Martines, E. Casarotto, Elena Gaio, M. Fauri, A. Sardella, F. Bellina, H. Bergsåker, V. Schmidt, W. Baker, L. Apolloni, P. Collarin, V. Antoni, R. Piovan, M. Valisa, P. Campostrini, O. Hemming, Adriano Luchetta, Roberto Pasqualotto, N. Pomaro, Susanna Cappello, Francesco Gnesotto, Daniele Desideri, A. De Lorenzi, Massimo Guarnieri, C. Ferrer, L. Tramontin, Alvise Maschio, Antoni, V, Apolloni, L, Bagatin, M, Baker, W, Bassan, M, Bellina, F, Benfatto, I, Bergsaker, H, Buffa, A, Campostrini, P, Cappello, S, Carraro, L, Casarotto, E, Chitarin, G, Collarin, P, Costa, S, Delorenzi, A, Desideri, D, Fauri, M, Ferrer, C, Fiorentin, P, Gaio, E, Giudicotti, L, Gnesotto, F, Guarnieri, M, Guatieri, R, Hemming, O, Innocente, P, Kusstatscher, P, Luchetta, A, Malesani, G, Manduchi, G, Marchiori, G, Martin, P, Martines, E, Martini, S, Maschio, A, Moresco, M, Murari, A, Oleary, P, Paccagnella, R, Pasqualotto, R, Piovan, R, Pomaro, N, Puiatti, M, Rostagni, G, Sardella, A, Scarin, P, Schmidt, V, Serianni, G, Sonato, P, Spada, E, Stella, A, Toigo, V, Tramontin, L, Trevisan, F, Valisa, M, Vitturi, S, Zaccaria, P, Zilli, E, and Zollino, G
Subjects: Electron density, Materials science, Nuclear Energy and Engineering, Impurity, Beta (plasma physics), RFP, Ion temperature, reversed field pinch, Electron, Atomic physics, Condensed Matter Physics, RFX, Plasma current
Abstract: The results of the first year of operation of the experiment RFX are reported. Profiles of electron density, electron and ion temperature and impurity emission have been measured at plasma current I
Published: 1993

18. Drift-Alfven vortex structures in the edge region of a fusion relevant plasma

Author: R. Cavazzana, V. Antoni, M. Zuin, Gianluigi Serianni, E. Spada, Monica Spolaore, Emilio Martines, Nicola Vianello, Vianello, N, Spolaore, M, Martines, E, Cavazzana, R, Serianni, G, Zuin, M, Spada, E, and Antoni, V
Subjects: Physics, Nuclear and High Energy Physics, Fusion, RFX-mod, Turbulence, Edge region, FOS: Physical sciences, Plasma, reversed field pinch, Edge (geometry), Condensed Matter Physics, Physics - Plasma Physics, TRANSPORT, Vortex, Computational physics, Plasma Physics (physics.plasm-ph), Physics::Fluid Dynamics, FLOWS, BOUNDARY, Physics::Plasma Physics, Physics::Space Physics, RFP, TURBULENCE, VORTICES, drift-Alfvé turbulence
Abstract: Edge turbulent structures are commonly observed in fusion devices and are generally believed to be responsible for confinement degradation. Among their origin Drift-Alfven turbulence is one of the most commonly suggested. Drift-Alfven paradigm allows the existence of localized vortex-like structures observed also in various systems. Here we present the evidence of the presence of drift-Alfv\'en vortices in the edge region of RFX-Mod RFP device, showing how these structures are responsible for electromagnetic turbulence at the edge and its intermittent nature., Comment: 4 pages, 5 figures, Revised version submitted for publication to Physical Review Letters
Published: 2010

19. Helical equilibria and magnetic structures in the reversed field pinch and analogies to the tokamak and stellarator

Author: Stefano Munaretto, L. Carraro, Alessandra Canton, S. Dal Bello, Matteo Zuin, A. Pizzimenti, D. Bonfiglio, S. Martini, V. Antoni, Elena Gaio, Fulvio Auriemma, Lionello Marrelli, Fabio Sattin, B. Momo, Tommaso Bolzonella, Nicola Vianello, L. Apolloni, Emilio Martines, Gianluca Spizzo, M. Baruzzo, R. Delogu, Paolo Franz, Susanna Cappello, P. Piovesan, Italo Predebon, M. Moresco, Rita Lorenzini, Leonardo Giudicotti, L. Novello, Sheena Menmuir, Paolo Scarin, P. Zanca, Anton Soppelsa, Luca Grando, G. De Masi, M. Spolaore, Giuseppe Marchiori, Roberto Pasqualotto, Neil Pomphrey, S. C. Guo, David Terranova, A. Zamengo, P. Innocente, Maria Ester Puiatti, Piero Martin, E. Gazza, Dominique Escande, Alberto Alfier, Allen H. Boozer, M. Valisa, L. Piron, Matteo Agostini, Barbara Zaniol, M. Brombin, R. Piovan, L. Zanotto, E. Spada, Gabriele Manduchi, Gianluigi Serianni, Alessandro Fassina, Roberto Paccagnella, Federica Bonomo, R. Cavazzana, Silvia Spagnolo, Cesare Taliercio, M. Gobbin, Puiatti, M, Alfier, A, Auriemma, F, Cappello, S, Carraro, L, Cavazzana, R, Dal Bello, S, Fassina, A, Escande, D, Franz, P, Gobbin, M, Innocente, P, Lorenzini, R, Marrelli, L, Martin, P, Piovesan, P, Predebon, I, Sattin, F, Spizzo, G, Terranova, D, Valisa, M, Zaniol, B, Zanotto, L, Zuin, M, Agostini, M, Antoni, V, Apolloni, L, Baruzzo, M, Bolzonella, T, Bonfiglio, D, Bonomo, F, Boozer, A, Brombin, M, Canton, A, Delogu, R, De Masi, G, Gaio, E, Gazza, E, Giudicotti, L, Grando, L, Guo, S, Manduchi, G, Marchiori, G, Martines, E, Martini, S, Menmuir, S, Momo, B, Moresco, M, Munaretto, S, Novello, L, Paccagnella, R, Pasqualotto, R, Piovan, R, Piron, L, Pizzimenti, A, Pomphrey, N, Scarin, P, Serianni, G, Spada, E, Soppelsa, A, Spagnolo, S, Spolaore, M, Taliercio, C, Vianello, N, Zamengo, A, and Zanca, P
Subjects: Physics, Tokamak, RFX-mod, Reversed field pinch, Field (physics), Condensed matter physics, Magnetic confinement fusion, reversed field pinch, Edge (geometry), SELF-ORGANIZATION, Condensed Matter Physics, law.invention, Core (optical fiber), quasi-single helicity, INTERNAL TRANSPORT BARRIERS, MHD ACTIVE CONTROL, Nuclear Energy and Engineering, law, RFP, QSH, plasma equilibrium, Atomic physics, Pressure gradient, Stellarator
Abstract: The reversed field pinch configuration is characterized by the presence of magnetic structures both in the core and at the edge: in the core, at high plasma current the spontaneous development of a helical structure is accompanied by the appearance of internal electron transport barriers; at the edge strong pressure gradients, identifying an edge transport barrier, are observed too, related to the position of the field reversal surface. The aim of this paper is the experimental characterization of both the internal and edge transport barriers in relation to the magnetic topology, discussing possible analogies and differences with other confinement schemes. © 2009 IOP Publishing Ltd.
Published: 2009

20. Magnetic and electrostatic structures measured in the edge region of the RFX-mod experiment

Author: Roberto Cavazzana, Matteo Agostini, Nicola Vianello, Paolo Scarin, V. Antoni, Gianluigi Serianni, M. Spolaore, Emilio Martines, Matteo Zuin, E. Spada, Spolaore, M, Vianello, N, Agostini, M, Cavazzana, R, Martines, E, Serianni, G, Scarin, P, Spada, E, Zuin, M, and Antoni, V
Subjects: Nuclear and High Energy Physics, Fusion, RFX-mod, Reversed field pinch, Plane (geometry), Turbulence, Chemistry, coherent structure, reversed field pinch, Fusion power, Vorticity, Molecular physics, Magnetic field, Nuclear physics, Nuclear Energy and Engineering, Physics::Plasma Physics, plasma turbulence, RFP, General Materials Science, Current density
Abstract: Coherent structures emerging from turbulence background have been detected in the edge region of the RFX-mod Reversed Field Pinch fusion device by using a new and original probe system measuring simultaneously and on the same location magnetic and electrostatic fluctuations. In agreement with theory it has been experimentally found that pressure structures detected in the cross-field plane, often referred in literature as 'blobs', correspond to E × B vorticity structures and are associated to current density filaments, oriented along the main magnetic field. The results are compared with those provided by the measured relationship between magnetic fluctuations and coherent structures on HeI emission observed by the Gas Puffing Imaging system, confirming the presence of such structures also at high current regimes. © 2009.
Published: 2009

21. High current regimes in RFX-mod

Author: Cesare Taliercio, V. Antoni, Gabriele Manduchi, Fulvio Auriemma, Alberto Alfier, S. Dal Bello, L. Apolloni, L. Carraro, Gianluigi Serianni, S. Ortolani, Fabio Sattin, D. Marcuzzi, M. Baruzzo, Alessandro Fassina, Giuseppe Chitarin, Paolo Bettini, P. Innocente, M. Spolaore, Oliviero Barana, Alessandra Canton, N. Pomaro, Matteo Zuin, Francesco Gnesotto, D. Bonfiglio, Enrico Zilli, G. Rostagni, S. Martini, Piergiorgio Sonato, V. Toigo, David Terranova, Gianluca Spizzo, F. Milani, Anton Soppelsa, A. De Lorenzi, M. Gobbin, M. Moresco, Roberto Paccagnella, Italo Predebon, D. Yadikin, Piero Martin, L. Guazzotto, E. Gazza, Matteo Agostini, Federica Bonomo, Lionello Marrelli, Tommaso Bolzonella, Nicola Vianello, P. Zanca, R. Cavazzana, A. Buffa, Emilio Martines, Rita Lorenzini, Leonardo Giudicotti, M. Brombin, Silvia Spagnolo, Paolo Franz, Paolo Scarin, P. Buratti, Giuseppe Marchiori, R. Piovan, L. Zanotto, P. Piovesan, M. Valisa, Maria Ester Puiatti, Simone Peruzzo, Elena Gaio, V. Igochine, Karsten McCollam, E. Spada, M. Cavinato, Susanna Cappello, G. De Masi, Andrea Pizzimenti, S. C. Guo, Dominique Escande, Luca Grando, Barbara Zaniol, P. Zaccaria, Adriano Luchetta, Roberto Pasqualotto, L. Novello, J. S. Sarff, L. Piron, Valisa, M, Bolzonella, T, Buratti, P, Carraro, L, Cavazzana, R, Dal Bello, S, Martin, P, Pasqualotto, R, Sarff, J, Spolaore, M, Zanca, P, Zanotto, L, Agostini, M, Alfier, A, Antoni, V, Apolloni, L, Auriemma, F, Barana, O, Baruzzo, M, Bettini, P, Bonfiglio, D, Bonomo, F, Brombin, M, Buffa, A, Canton, A, Cappello, S, Cavinato, M, Chitarin, G, De Lorenzi, A, De Masi, G, Escande, D, Fassina, A, Franz, P, Gaio, E, Gazza, E, Giudicotti, L, Gnesotto, F, Gobbin, M, Grando, L, Guazzotto, L, Guo, S, Igochine, V, Innocente, P, Lorenzini, R, Luchetta, A, Manduchi, G, Marchiori, G, Marcuzzi, D, Marrelli, L, Martini, S, Martines, E, Mccollam, K, Milani, F, Moresco, M, Novello, L, Ortolani, S, Paccagnella, R, Peruzzo, S, Piovan, R, Piron, L, Pizzimenti, A, Piovesan, P, Pomaro, N, Predebon, I, Puiatti, M, Rostagni, G, Sattin, F, Scarin, P, Serianni, G, Sonato, P, Spada, E, Soppelsa, A, Spagnolo, S, Spizzo, G, Taliercio, C, Terranova, D, Toigo, V, Vianello, N, Yadikin, D, Zaccaria, P, Zaniol, B, Zilli, E, and Zuin, M
Subjects: Physics, plasma confinement, RFX-mod, Reversed field pinch, Condensed matter physics, reversed field pinch, Torus, Plasma, Electron, Condensed Matter Physics, Symmetry (physics), quasi-single helicity, Nuclear Energy and Engineering, Physics::Plasma Physics, RFP, Electron temperature, QSH, Magnetohydrodynamic drive, Current (fluid)
Abstract: Optimization of machine operation, including plasma position control, density control and especially feedback control on multiple magnetohydrodynamic modes, has led RFX-mod to operate reliably at 1.5 MA, the highest current ever achieved on a reversed field pinch (RFP). At high current and low density the magnetic topology spontaneously self-organizes in an Ohmical helical symmetry, with the new magnetic axis helically twisting around the geometrical axis of the torus. The separatrix of the island disappears leaving a wide and symmetric thermal structure with large gradients in the electron temperature profile. The new topology still displays an intermittent nature but its overall presence has reached 85% of the current flat-top period. The large gradients in the electron temperature profile appear to be marginal for the destabilization of ion temperature gradient modes on the assumption that ions and electrons have the same gradients. There are indications that higher currents could provide the conditions under which to prove the existence of a true helical equilibrium as the standard RFP configuration. © 2008 IOP Publishing Ltd.
Published: 2008

22. Magnetic self organization, MHD active control and confinement in RFX-mod

Author: Paolo Zanca, Piero Martin, A. De Lorenzi, E. Gazza, F. Milani, S. Dal Bello, Lionello Marrelli, F. Sattin, Leonardo Giudicotti, Giuseppe Marchiori, N. Vianello, Matteo Agostini, R. Piovan, Fulvio Auriemma, A. Masiello, S. Ortolani, Vanni Toigo, M. Brombin, P. Innocente, G. Gadani, G. Rostagni, Alberto Alfier, L. Novello, M. Moresco, Giuseppe Chitarin, Italo Predebon, Anton Soppelsa, M. Valisa, D. F. Escande, Paolo Bettini, Mario Cavinato, L. Apolloni, S. C. Guo, Andrea Murari, C. Alessi, Roberto Pasqualotto, Maria Ester Puiatti, C. Taccon, R. Paccagnella, Piergiorgio Sonato, D. Bonfiglio, Simone Peruzzo, Diego Marcuzzi, Emilio Martines, Federica Bonomo, Paolo Franz, Barbara Zaniol, Elena Gaio, Enrico Zilli, S. Martini, C. Taliercio, Gianluca Spizzo, S. Cappello, V. Antoni, Gabriele Manduchi, Alessandro Fassina, L. Zanotto, P. Piovesan, Alessandra Canton, Matteo Zuin, L. Carraro, T. Bolzonella, Luca Grando, G. Malesani, A. Pizzimenti, D. Terranova, Rita Lorenzini, E. Spada, G. Serianni, Marco Gobbin, P. Zaccaria, Giuseppe Zollino, Roberto Cavazzana, Adriano Luchetta, P. Scarin, A. Buffa, M. Spolaore, Oliviero Barana, Francesco Gnesotto, N. Pomaro, Marrelli, L, Zanca, P, Valisa, M, Marchiori, G, Alfier, A, Bonomo, F, Gobbin, M, Piovesan, P, Terranova, D, Agostini, M, Alessi, C, Antoni, V, Apolloni, L, Auriemma, F, Barana, O, Bettini, P, Bolzonella, T, Bonfiglio, D, Brombin, M, Buffa, A, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Cavinato, M, Chitarin, G, Dal Bello, S, De Lorenzi, A, Escande, D, Fassina, A, Franz, P, Gadani, G, Gaio, E, Gazza, E, Giudicotti, L, Gnesotto, F, Grando, L, Guo, S, Innocente, P, Lorenzini, R, Luchetta, A, Malesani, G, Manduchi, G, Marcuzzi, D, Martin, P, Martini, S, Martines, E, Masiello, A, Milani, F, Moresco, M, Murari, A, Novello, L, Ortolani, S, Paccagnella, R, Pasqualotto, R, Peruzzo, S, Piovan, R, Pizzimenti, A, Pomaro, N, Predebon, I, Puiatti, M, Rostagni, G, Sattin, F, Scarin, P, Serianni, G, Sonato, P, Spada, E, Soppelsa, A, Spizzo, G, Spolaore, M, Taccon, C, Taliercio, C, Toigo, V, Vianello, N, Zaccaria, P, Zaniol, B, Zanotto, L, Zilli, E, Zollino, G, and Zuin, M
Subjects: Physics, REVERSED-FIELD PINCHES, RFX-mod, Reversed field pinch, Sideband, active control, Rotational symmetry, Boundary (topology), INTELLIGENT SHELL, reversed field pinch, Condensed Matter Physics, Magnetic field, BOUNDARY, Nuclear Energy and Engineering, Physics::Plasma Physics, Quantum electrodynamics, Harmonics, RFP, RECONSTRUCTION, Magnetohydrodynamics, PLASMA-WALL INTERACTIONS, RESISTIVE WALL, Saddle
Abstract: RFX-mod is a reversed field pinch (RFP) experiment equipped with a system that actively controls the magnetic boundary. In this paper we describe the results of a new control algorithm, the clean mode control (CMC), in which the aliasing of the sideband harmonics generated by the discrete saddle coils is corrected in real time. CMC operation leads to a smoother (i.e. more axisymmetric) boundary. Tearing modes rotate (up to 100 Hz) and partially unlock. Plasma-wall interaction diminishes due to a decrease of the non-axisymmetric shift of the plasma column. With the ameliorated boundary control, plasma current has been successfully increased to 1.5 MA, the highest for an RFP. In such regimes, the magnetic dynamics is dominated by the innermost resonant mode, the internal magnetic field gets close to a pure helix and confinement improves. © 2007 IOP Publishing Ltd.
Published: 2007

23. Vortex-induced diffusivity in reversed field pinch plasmas

Author: V. Antoni, G. Regnoli, Roberto Cavazzana, James R. Drake, G. Serianni, E. Spada, M. Spolaore, Emilio Martines, Henric Bergsåker, N. Vianello, Spolaore, M, Antoni, V, Spada, E, Bergsaker, H, Cavazzana, R, Drake, J, Martines, E, Regnoli, G, Serianni, G, and Vianello, N
Subjects: Physics, education.field_of_study, Condensed matter physics, Reversed field pinch, Population, coherent structure, General Physics and Astronomy, reversed field pinch, Plasma, VELOCITY SHEAR, Thermal diffusivity, Vortex, Shear (sheet metal), Physics::Fluid Dynamics, Physics::Plasma Physics, COHERENT STRUCTURES, plasma turbulence, RFP, ELECTROSTATIC TURBULENCE, EDGE TURBULENCE, INTERMITTENCY, Diffusion (business), education, Shear flow
Abstract: Coherent structures identified in two reversed field pinch experiments are interpreted as a dynamic balance of dipolar and monopolar vortices growing and evolving under the effect of the ExB flow shear. For the first time their contribution to the anomalous transport has been estimated in fusion related plasmas, showing that they can account for up to 50% of the total plasma diffusivity. The experimental findings indicate that the diffusion coefficient associated with the coherent structures depends on the relative population of the two types of vortices and is minimum when the two populations are equal. An interpretative model is proposed to explain this feature.
Published: 2004
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24. Anomalous particle transport and flow shear in the edge region of RFP's

Author: Gianluigi Serianni, Nicola Vianello, Mario Bagatin, E. Spada, G. Regnoli, Henric Bergsåker, James R. Drake, M. Spolaore, Emilio Martines, Roberto Cavazzana, V. Antoni, Antoni, V, Bergsaker, H, Serianni, G, Spolaore, M, Vianello, N, Cavazzana, R, Regnoli, G, Spada, E, Martines, E, Bagatin, M, and Drake, J
Subjects: Physics, Nuclear and High Energy Physics, ExB, Reversed field pinch, Turbulence, Velocity, Transport, Plasma, Fusion power, Thermal diffusivity, Particle transport, law.invention, Computational physics, Nuclear physics, Nuclear Energy and Engineering, Shear (geology), law, Velocity shear, Intermittency, RFP, General Materials Science
Abstract: The effect of the E × B velocity shear on the particle flux carried by electrostatic fluctuations at the edge is discussed comparing the results of the experiments T2R (R = 1.2 m, a = 0.18 m) and RFX (R = 2 m, a = 0.5 m). In both experiments electrostatic turbulence accounts for most of the particle flux. The shear of the E × B velocity is close or larger than the value required for turbulence suppression or reduction. Particle fluxes exhibit bursts which carry a large fraction of the total particle flux, and which tend to cluster during magnetic relaxation phase. On the average a Bohm estimate of the experimental plasma diffusivity accounts for the experimental data. Finally a discussion on the methods for turbulence control is given. © 2003 Elsevier Science B.V. All rights reserved.
Published: 2003

25. Analysis and modelling of the magnetic and plasma profiles during PPCD experiments in RFX

Author: Gianluca Spizzo, Paolo Innocente, A. De Lorenzi, G. Malesani, V. Antoni, C. Taliercio, S. C. Guo, Pietro Fiorentin, R. Paccagnella, G. Telesca, Lorella Carraro, Enrico Zilli, S. Martini, B. Pégourié, Giuseppe Marchiori, Maria Ester Puiatti, P. Piovesan, Simone Peruzzo, F. Milani, L. Zanotto, Paolo Zanca, M. Spolaore, Oliviero Barana, Elena Gaio, P. Nielsen, M. Valisa, Francesco Gnesotto, Mario Bagatin, Vanni Toigo, M. Moresco, Piergiorgio Sonato, Lionello Marrelli, Tommaso Bolzonella, Roberto Pasqualotto, D. Terranova, A. Masiello, Rita Lorenzini, Alessandra Canton, Piero Martin, Matteo Zuin, S. Cappello, G. Rostagni, A. Cravotta, D. Bettella, S. Dal Bello, R. Piovan, Leonardo Giudicotti, P. Zaccaria, G. Regnoli, Emilio Martines, Adriano Luchetta, Paolo Franz, Giuseppe Zollino, Gabriele Manduchi, S. Ortolani, P. Scarin, D. Desideri, E. Spada, W. Baker, L. Apolloni, A. Buffa, Barbara Zaniol, Diego Marcuzzi, Giuseppe Chitarin, Luca Grando, A. Murari, N. Vianello, N. Pomaro, G. Preti, F. D'Angelo, L. Garzotti, G. Serianni, Mario Cavinato, Lorenzo Frassinetti, D. F. Escande, Fabio Sattin, Paolo Bettini, Roberto Cavazzana, Puiatti, M, Cappello, S, Lorenzini, R, Martini, S, Ortolani, S, Paccagnella, R, Sattin, F, Terranova, A, Bolzonella, T, Buffa, A, Canton, A, Carraro, L, Escande, D, Garzotti, L, Innocente, P, Marrelli, L, Martines, E, Scarin, P, Spizzo, G, Valisa, M, Zanca, P, Antoni, V, Apolloni, L, Bagatin, M, Baker, W, Barana, O, Bettella, D, Bettini, P, Cavazzana, R, Cavinato, M, Chitarin, G, Cravotta, A, D'Angelo, F, Dal Bello, S, De Lorenzi, A, Desideri, D, Fiorentin, P, Franz, P, Frassinetti, L, Gaio, E, Giudicotti, L, Gnesotto, F, Grando, L, Guo, S, Luchetta, A, Malesani, G, Manduchi, G, Marchiori, G, Marcuzzi, D, Martin, P, Masiello, A, Milani, F, Moresco, M, Murari, A, Nielsen, P, Pasqualotto, R, Pegourie, B, Peruzzo, S, Piovan, R, Piovesan, P, Pomaro, N, Preti, G, Regnoli, G, Rostagni, G, Serianni, G, Sonato, P, Spada, E, Spolaore, M, Taliercio, C, Telesca, G, Toigo, V, Vianello, N, Zaccaria, P, Zaniol, B, Zanotto, L, Zilli, E, Zollino, G, and Zuin, M
Subjects: Physics, Nuclear and High Energy Physics, Reversed field pinch, Condensed matter physics, Turbulence, Phase (waves), Magnetic confinement fusion, IMPROVED CONFINEMENT, reversed field pinch, Plasma, Mechanics, Condensed Matter Physics, POLOIDAL CURRENT DRIVE, pulsed poloidal current drive, REVERSED-FIELD-PINCH, SINGLE-HELICITY, Physics::Plasma Physics, RFP, HEAT-TRANSPORT, Transient (oscillation), Magnetohydrodynamics, PPCD, RFX, Dynamo
Abstract: In this paper, we analyse the main features of the pulsed poloidal current drive (PPCD) technique, used in the reversed field pinch configuration to achieve improved confinement conditions. In the RFX experiment, PPCD corresponds to a decrease of the magnetic fluctuations, to a peaking of the temperature profile, and to a reduced transport and plasma-wall interaction. A three-dimensional MHD nonlinear code and one-dimensional time-dependent transport models have been applied to study the effect of PPCD on the magnetic and plasma profiles. The three-dimensional MHD simulations show that the external inductive drive pinches and peaks the current profile driving the configuration through a transient phase, where the spontaneous turbulent dynamo action is quenched. The one-dimensional transport codes indicate that the experimental profile modifications associated with PPCD are consistent with a reduction of the stochastic transport.
Published: 2003

26. Transport Processes in Reversed-Field-Pinch Plasmas: Inconsistency with the Self-Organized-Criticality Paradigm

Author: G. Regnoli, L. Tramontin, V. Antoni, L. Fattorini, Vincenzo Carbone, M. Spolaore, E. Spada, Emilio Martines, G. Serianni, N. Vianello, Pierluigi Veltri, Roberto Cavazzana, Antoni, V, Carbone, V, Cavazzana, R, Regnoli, G, Vianello, N, Spada, E, Fattorini, L, Martines, E, Serianni, G, Spolaore, M, Tramontin, L, and Veltri, P
Subjects: Physics, Reversed field pinch, plasma physics, turbulence, Edge region, plasma diagnostic, General Physics and Astronomy, Flux, Laminar flow, reversed field pinch, Plasma, Mechanics, symbols.namesake, Criticality, Physics::Plasma Physics, RFP, symbols, Nuclear fusion, Statistical analysis, SOC, Statistical physics, Pareto distribution, self-organized criticality, RFX, non linear dynamics
Abstract: A study of transport processes in reversed-field-pinch plasmas was performed. Statistical properties of particle fluxes driven by electrostatic turbulence were also compared with those predicted by the self-organized-criticality (SOC) model. The statistical analysis revealed that laminar times between bursts carrying more than 50% of the particle transport at the edge exhibited a power law decay. The decomposition of particle flux fluctuations in the edge region of RFX showed that fluctuations were not self-similar in character.
Published: 2001

27. Transport mechanisms and enhanced confinement studies in RFX

Author: V Antoni, M Valisa, L Apolloni, M Bagatin, W Baker, O Barana, R Bartiromo, P Bettini, A Boboc, T Bolzonella, A Buffa, A Canton, S Cappello, L Carraro, R Cavazzana, G Chitarin, S Costa, F D'Angelo, S. Dal Bello, A. De Lorenzi, D Desideri, D Escande, L Fattorini, P Fiorentin, P Franz, E Gaio, L Garzotti, L Giudicotti, F Gnesotto, L Grando, S.C Guo, P Innocente, A Intravaia, R Lorenzini, A Luchetta, G Malesani, G Manduchi, G Marchiori, L Marrelli, P Martin, E Martines, S Martini, A Maschio, A Masiello, F Milani, M Moresco, A Murari, P Nielsen, M O'Gorman, S Ortolani, R Paccagnella, R Pasqualotto, B P gouri, S Peruzzo, R Piovan, N Pomaro, A Ponno, G Preti, M.E Puiatti, G Rostagni, F Sattin, P Scarin, G Serianni, P Sonato, E Spada, G Spizzo, M Spolaore, C Taliercio, G Telesca, D Terranova, V Toigo, L Tramontin, N Vianello, M Viterbo, L Zabeo, P Zaccaria, P Zanca, B Zaniol, L Zanotto, E Zilli, G Zollino, Antoni, V, Valisa, M, Apolloni, L, Bagatin, M, Baker, W, Barana, O, Bartiromo, R, Bettini, P, Boboc, A, Bolzonella, T, Buffa, A, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Chitarin, G, Costa, S, D'Angelo, F, Dal Bello, S, De Lorenzi, A, Desideri, D, Escande, D, Fattorini, L, Fiorentin, P, Franz, P, Gaio, E, Garzotti, L, Giudicotti, L, Gnesotto, F, Grando, L, Guo, S, Innocente, P, Intravaia, A, Lorenzini, R, Luchetta, A, Malesani, G, Manduchi, G, Marchiori, G, Marrelli, L, Martin, P, Martines, E, Martini, S, Maschio, A, Masiello, A, Milani, F, Moresco, M, Murari, A, Nielsen, P, O'Gorman, M, Ortolani, S, Paccagnella, R, Pasqualotto, R, Pegourie, B, Peruzzo, S, Piovan, R, Pomaro, N, Ponno, A, Preti, G, Puiatti, M, Rostagni, G, Sattin, F, Scarin, P, Serianni, G, Sonato, P, Spada, E, Spizzo, G, Spolaore, M, Taliercio, C, Telesca, G, Terranova, D, Toigo, V, Tramontin, L, Vianello, N, Viterbo, M, Zabeo, L, Zaccaria, P, Zanca, P, Zaniol, B, Zanotto, L, Zilli, E, and Zollino, G
Subjects: Nuclear and High Energy Physics, Materials science, Tokamak, Condensed matter physics, PLASMA, Monte Carlo method, Plasma, reversed field pinch, Condensed Matter Physics, Helicity, law.invention, Magnetic field, REDUCTION, Thermal conductivity, REVERSED-FIELD-PINCH, law, Physics::Plasma Physics, ELECTROSTATIC TURBULENCE, RFP, Lundquist number, Scaling, RFX
Abstract: The results of an extensive study on transport mechanisms and on improved confinement scenarios in RFX are reported. The scaling of the thermal conductivity in the core with the Lundquist number indicates that the magnetic field in this region is not fully stochastic, as proved by the existence of thermal barriers observed in single helicity configurations. The electrostatic transport at the edge has been proved to depend on the highly sheared E × B flow, which has been interpreted using fluid and Monte Carlo models. Regimes of improved confinement have been obtained in the core by poloidal current drive techniques, and the electrostatic transport has been reduced at the edge by biasing experiments. A radiation mantle caused by impurity seeding has been found to successfully reduce the local plasma-wall interaction without causing a significant deterioration in the plasma performance.
Published: 2001

28. New insights into MHD dynamics of magnetically confined plasmas from experiments in RFX

Author: Paolo Zanca, L. Fattorini, R. Piovan, R. Bartiromo, A. Boboc, Piero Martin, S. Costa, P. Zaccaria, L. Apolloni, Vanni Toigo, G. Malesani, Enrico Zilli, S. Martini, B. Pégourié, G. Rostagni, F. D'Angelo, Emilio Martines, Pietro Fiorentin, Barbara Zaniol, R. Paccagnella, Paolo Franz, Maria Ester Puiatti, P. Innoccente, C. Taliercio, Lorella Carraro, Giuseppe Telesca, Giuseppe Zollino, Roberto Pasqualotto, L. Garzotti, Antonio Ponno, Mario Bagatin, Giuseppe Marchiori, S. Cappello, Luca Zabeo, M. Moresco, Alvise Maschio, Giuseppe Chitarin, Leonardo Giudicotti, D. Terranova, Rita Lorenzini, N. Vianello, Fabio Sattin, Gabriele Manduchi, P. Nielsen, A. Intravaia, Paolo Bettini, A. Murari, M. Valisa, S. C. Guo, Lionello Marrelli, Dominique Escande, Tommaso Bolzonella, L. Tramontin, Luca Grando, M. Ogorman, Gianluca Spizzo, L. Zanotto, E. Spada, W. Baker, Alessandra Canton, G. Serianni, V. Antoni, F. Milani, Piergiorgio Sonato, Giovanni Preti, S. Ortolani, Simone Peruzzo, Elena Gaio, Roberto Cavazzana, Daniele Desideri, N. Pomaro, S. Dal Bello, Adriano Luchetta, P. Scarin, A. Buffa, M. Spolaore, Oliviero Barana, Francesco Gnesotto, A. De Lorenzi, A. Masiello, M. Viterbo, Martin, P, Martini, S, Antoni, V, Apolloni, L, Bagatin, M, Baker, W, Barana, O, Bartiromo, R, Bettini, P, Boboc, A, Bolzonella, T, Buffa, A, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Chitarin, G, Costa, S, D'Angelo, F, Dal Bello, S, De Lorenzi, A, Desideri, D, Escande, D, Fattorini, L, Fiorentin, P, Franz, P, Gaio, E, Garzotti, L, Giudicotti, L, Gnesotto, F, Grando, L, Guo, S, Innoccente, P, Intravaia, A, Lorenzini, R, Luchetta, A, Malesani, G, Manduchi, G, Marchiori, G, Marrelli, L, Martines, E, Maschio, A, Masiello, A, Milani, F, Moresco, M, Murari, A, Nielsen, P, O'Gorman, M, Ortolani, S, Paccagnella, R, Pasqualotto, R, Pegourie, B, Peruzzo, S, Piovan, R, Pomaro, N, Ponno, A, Preti, G, Puiatti, M, Rostagni, G, Sattin, F, Scarin, P, Serianni, G, Sonato, P, Spada, E, Spizzo, G, Spolaore, M, Taliercio, C, Telesca, G, Terranova, D, Toigo, V, Tramontin, L, Valisa, M, Vianello, N, Viterbo, M, Zabeo, L, Zaccaria, P, Zanca, P, Zaniol, B, Zanotto, L, Zilli, E, and Zollino, G
Subjects: Physics, plasma confinement, Nuclear and High Energy Physics, Resistive touchscreen, Condensed matter physics, Reversed field pinch, mode locking, Magnetic confinement fusion, Laminar flow, reversed field pinch, Plasma, Condensed Matter Physics, Amplitude, magnetic configuration, Physics::Plasma Physics, Quantum electrodynamics, RFP, tearing mode, Magnetohydrodynamics, RFX, Dynamo
Abstract: The experimental and theoretical activity performed in the RFX device has allowed a deeper insight into the MHD properties of the reversed field pinch (RFP) configuration. A set of successful experiments has demonstrated the possibility of influencing both the amplitude and the spectrum of the magnetic fluctuations which characterize the RFP configuration. A new regime (quasi-single-helicity states) where the dynamo mechanism works in a nearly laminar way and a helical core plasma is produced has been investigated. With these studies a reduction of magnetic chaos has been obtained. The continuous rotation of wall locked resistive tearing modes has been obtained by an m = 0 rotating perturbation. This perturbation induces rotation of m = 1 non-linearly coupled modes.
Published: 2000

29. Particle and energy transport in the RFX experiment

Author: V. Antoni, P. Martin, M. Bagatin, R. Bartiromo, R. Bilato, T. Bolzonella, A. Buffa, A. Canton, R. Cavazzana, D. Desideri, P. Franz, L. Garzotti, D. Gregoratto, P. Innocente, A. Intravaia, E. Martines, S. Martini, L. Marrelli, M. Moresco, A. Murari, R. Paccagnella, R. Pasqualotto, G. Serianni, E. Spada, G. Spizzo, M. Spolaore, L. Tramontin, D. Terranova, P. Zanca, Antoni, V, Martin, P, Bagatin, M, Bartiromo, R, Bilato, R, Bolzonella, T, Buffa, A, Canton, A, Cavazzana, R, Desideri, D, Franz, P, Garzotti, L, Gregoratto, D, Innocente, P, Intravaia, A, Martines, E, Martini, S, Marrelli, L, Moresco, M, Murari, A, Paccagnella, R, Pasqualotto, R, Serianni, G, Spada, E, Spizzo, G, Spolaore, M, Tramontin, L, Terranova, D, and Zanca, P
Subjects: Physics::Plasma Physics, RFP, reversed field pinch, RFX
Abstract: The particle and energy transport mechanisms have been investigated in RFX. In the core the particle diffusivity and thermal conductivity are consistent with a stochastic magnetic field model. At the edge particle transport is mainly driven by electrostatic fluctuations, whereas radiation, electrostatic and magnetic turbulence account only for 50% of the total energy losses.
Published: 1999

30. Recent Progress in RFP Research on the RFX Experiment

Author: R. Bartiromo, A. Buffa, V. Antoni, L. Apolloni, M. Bagatin, W. Baker, F. Bellina, P. Bettini, R. Bilato, T. Bolzonella, A. Canton, S. Cappello, L. Carraro, R. Cavazzana, G. Chitarin, S. Costa, F. D'Angelo, A. De Lorenzi, G. De Pol, D. Desideri, D. Escande, P. Fiorentin, P. Franz, E. Gaio, L. Garzotti, L. Giudicotti, F. Gnesotto, D. Gregoratto, S. C. Guo, P. Innocente, A. Intravaia, A. Luchetta, G. Malesani, G. Manduchi, G. Marchiori, L. Marrelli, P. Martin, E. Martines, S. Martini, A. Maschio, A. Masiello, F. Milani, M. Moresco, A. Murari, S. Ortolani, R. Paccagnella, R. Pasqualotto, S. Peruzzo, R. Piovan, N. Pomaro, R. Pugno, M. E. Puiatti, G. Rostagni, F. Sattin, P. Scarin, G. Serianni, P. Sonato, E. Spada, G. Spizzo, M. Spolaore, C. Taliercio, G. Telesca, D. Terranova, V. Toigo, L. Tramontin, M. Valisa, M. Viterbo, S. Vitturi, P. Zaccaria, P. Zanca, E. Zilli, G. Zollino, Bartiromo, R, Buffa, A, Antoni, V, Apolloni, L, Bagatin, M, Baker, W, Bellina, F, Bettini, P, Bilato, R, Bolzonella, T, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Chitarin, G, Costa, S, D'Angelo, F, De Lorenzi, A, De Pol, G, Desideri, D, Escande, D, Fiorentin, P, Franz, P, Gaio, E, Garzotti, L, Giudicotti, L, Gnesotto, F, Gregoratto, D, Guo, S, Innocente, P, Intravaia, A, Luchetta, A, Malesani, G, Manduchi, G, Marchiori, G, Marrelli, L, Martin, P, Martines, E, Martini, S, Maschio, A, Masiello, A, Milani, F, Moresco, M, Murari, A, Ortolani, S, Paccagnella, R, Pasqualotto, R, Peruzzo, S, Piovan, R, Pomaro, N, Pugno, R, Puiatti, M, Rostagni, G, Sattin, F, Scarin, P, Serianni, G, Sonato, P, Spada, E, Spizzo, G, Spolaore, M, Taliercio, C, Telesca, G, Terranova, D, Toigo, V, Tramontin, L, Valisa, M, Viterbo, M, Vitturi, S, Zaccaria, P, Zanca, P, Zilli, E, and Zollino, G
Subjects: RFX-mod, Physics::Plasma Physics, RFP, reversed field pinch
Abstract: This paper presents an overview of recent experimental results obtained on the RFX device. We succeeded in obtaining and study RFP plasma with a plasma current up to 1 MA with negligible radiation losses and low effective charge. The local power and particle balance shows that in standard operation the plasma core is dominated by magnetic turbulence and that the global confinement is mainly provided by the edge region where a strongly sheared radial electric field is present. With poloidal current drive the amplitude of magnetic fluctuation and the thermal conductivity of the plasma core are reduced leading to improved confinement. Reduced heat transport is also observed when the width of the n spectrum of magnetic fluctuations is reduced.
Published: 1999

31. Recent progress in reversed field pinch research in the RFX experiment

Author: Paolo Innocente, Enrico Zilli, Piero Martin, A. Masiello, S. Martini, S. C. Guo, Maria Ester Puiatti, Gianluca Spizzo, Piergiorgio Sonato, M. Viterbo, G. Malesani, F. Milani, Alessandra Canton, T. Bolzonella, S. Cappello, G. Serianni, Giuseppe Zollino, Giuseppe Telesca, S. Vitturi, D. Gregoratto, R. Pugno, Roberto Cavazzana, L. Garzotti, Mario Bagatin, M. Moresco, F. Bellina, Simone Peruzzo, Elena Gaio, Alvise Maschio, V. Antoni, Leonardo Giudicotti, P. Scarin, D. Desideri, A. Buffa, R. Bilato, Lorella Carraro, D. F. Escande, L. Apolloni, Gabriele Manduchi, A. De Lorenzi, E. Spada, W. Baker, Fabio Sattin, L. Tramontin, R. Piovan, D. Terranova, P. Zaccaria, S. Ortolani, A. Intravaia, Paolo Bettini, F. D'Angelo, P. Zanca, R. Bartiromo, Pietro Fiorentin, Emilio Martines, R. Paccagnella, N. Pomaro, Cesare Taliercio, M. Spolaore, Paolo Franz, Francesco Gnesotto, G. De Pol, Vanni Toigo, S. Costa, Giuseppe Chitarin, Adriano Luchetta, Roberto Pasqualotto, Giuseppe Marchiori, M. Valisa, Lionello Marrelli, A. Murari, G. Rostagni, Bartiromo, R, Buffa, A, Antoni, V, Apolloni, L, Bagatin, M, Baker, W, Bellina, F, Bettini, P, Bilato, R, Bolzonella, T, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Chitarin, G, Costa, S, D'Angelo, F, De Lorenzi, A, De Pol, G, Desideri, D, Escande, D, Fiorentin, P, Franz, P, Gaio, E, Garzotti, L, Giudicotti, L, Gnesotto, F, Gregoratto, D, Guo, S, Innocente, P, Intravaia, A, Luchetta, A, Malesani, G, Manduchi, G, Marchiori, G, Marrelli, L, Martin, P, Martines, E, Martini, S, Maschio, A, Masiello, A, Milani, F, Moresco, M, Murari, A, Ortolani, S, Paccagnella, R, Pasqualotto, R, Peruzzo, S, Piovan, R, Pomaro, N, Pugno, R, Puiatti, M, Rostagni, G, Sattin, F, Scarin, P, Serianni, G, Sonato, P, Spada, E, Spizzo, G, Spolaore, M, Taliercio, C, Telesca, G, Terranova, D, Toigo, V, Tramontin, L, Valisa, M, Viterbo, M, Vitturi, S, Zaccaria, P, Zanca, P, Zilli, E, and Zollino, G
Subjects: Physics, Nuclear and High Energy Physics, Reversed field pinch, Turbulence, reversed field pinch, Plasma, Condensed Matter Physics, Effective nuclear charge, Computational physics, Nuclear magnetic resonance, Amplitude, Thermal conductivity, Physics::Plasma Physics, Electric field, RFP, Current (fluid), RFX
Abstract: The article presents an overview of recent experimental results obtained on the RFX device. The authors obtained and studied a reversed field pinch plasma with a plasma current of up to 1 MA, negligible radiation losses and low effective charge. The local power and particle balance shows that in standard operation the plasma core is dominated by magnetic turbulence and that the global confinement is mainly provided by the edge region, where a strongly sheared radial electric field is present. With poloidal current drive the amplitude of magnetic fluctuations and the thermal conductivity of the plasma core are reduced, leading to improved confinement. Reduced heat transport is also observed when the width of the n spectrum of magnetic fluctuations is reduced.
Published: 1999

32. Effect of the velocity shear on particle transport and edge turbulence in a reversed field pinch

Author: V. Antoni, Roberto Cavazzana, Daniele Desideri, M. Moresco, Emilio Martines, G. Serianni, L. Tramontin, Mario Bagatin, E. Spada, Antoni, V, Cavazzana, R, Martines, E, Serianni, G, Bagatin, M, Desideri, D, Moresco, M, Spada, E, and Tramontin, L
Subjects: Nuclear and High Energy Physics, turbulence, RFX, reversed field pinch, fluctuation, Tokamak, law.invention, Physics::Fluid Dynamics, symbols.namesake, Optics, Physics::Plasma Physics, law, RFP, Wavenumber, Langmuir probe, General Materials Science, Physics, Reversed field pinch, Turbulence, business.industry, Plasma, velocity shear, Computational physics, Amplitude, Nuclear Energy and Engineering, plasma turbulence, symbols, business, Stellarator
Abstract: In this paper the results of the investigation of the edge turbulence performed in RFX by a set of Langmuir probes and a homodyne reflectometer are reported. The electrostatic turbulence exhibits large fluctuation amplitude and broad band features in frequency and wavenumber. The effect of the spontaneous E × B velocity shear layer observed at the edge is addressed in order to identify decorrelation effects on the turbulence. Similarities with tokamaks and stellarators are discussed.
Published: 1999

33. Overview of the RFX-mod fusion science programme

Author: Piergiorgio Sonato, S. Dal Bello, Maria Ester Puiatti, Piero Martin, A. Fiorentin, Stefano Munaretto, F. Fellin, G. De Masi, M. Gobbin, Silvia Spagnolo, M. Furno Palumbo, P. Zaccaria, E. Gazza, M. Recchia, Raul Sanchez, Karsten McCollam, G. L. Trevisan, E. Spada, Alessandra Canton, Matteo Zuin, Ivo Furno, Christian Theiler, A. Zamengo, J.Q. Dong, Emilio Martines, B. E. Chapman, M. Dalla Palma, Paolo Franz, M. Brombin, V. Rigato, J. Framarin, Antonio Barbalace, P. Piovesan, Nicola Pilan, Donald A. Spong, Roberto Paccagnella, Wolf-Dieter Schneider, Barbara Zaniol, Fabio Villone, Leonardo Giudicotti, M. De Muri, T.C. Luce, R. Piovan, A. Ruzzon, V. Antoni, Giuseppe Zollino, Emanuele Sartori, Yueqiang Liu, G. Rostagni, M. Baruzzo, Manabu Takechi, Yongkyoon In, R. Delogu, Fulvio Auriemma, J. A. Alonso, M. Barp, C. Piron, D. Bonfiglio, Go Matsunaga, Enrico Zilli, G. Ciaccio, S. Martini, L. Piron, Marco Barbisan, Songfen Liu, M. Veranda, A. Scaggion, Giuseppe Chitarin, N. Pomaro, Luis Chacon, James D. Hanson, L. Apolloni, Yoichi Hirano, M. Spolaore, Francesco Gnesotto, F. Avino, Nicolò Marconato, M. Valente, Alberto Ferro, Fabio Sattin, Pierluigi Veltri, Gabriele Manduchi, L. Zanotto, C. Hidalgo, Paolo Innocente, Simona Barison, L. Novello, Italo Predebon, Rita Lorenzini, David Terranova, Luca Grando, Zhirui Wang, Vanni Toigo, M. Boldrin, M. Bigi, Adriano Luchetta, Paolo Bettini, Erik Olofsson, Andrea Rizzolo, Gianluigi Serianni, Anton Soppelsa, Cesare Taliercio, Roscoe White, C. Finotti, Susanna Cappello, N. Fonnesu, Roberto Pasqualotto, Paolo Scarin, R. Bilel, Shunsuke Ide, Alessandro Fassina, A. Maistrello, D. Carralero, Matteo Agostini, W. A. Cooper, P. Zanca, A. Buffa, Piero Agostinetti, G. Mazzitelli, X. Y. Xu, S. Fiameni, M. Moresco, John M. Finn, Lionello Marrelli, B. Momo, Tommaso Bolzonella, Nicola Vianello, Giuseppe Marchiori, D.K. Mansfield, M. Valisa, M. Okabayashi, S. C. Guo, Dominique Escande, Lorella Carraro, A. Pesce, M. Pavei, F. Ghezzi, Roberto Cavazzana, Satoru Kiyama, W. A. Gonzales, Simone Peruzzo, S.P. Hirshman, Elena Gaio, T. Barbui, Hajime Sakakita, G.L. Jackson, J. S. Sarff, Ambrogio Fasoli, D. Lopez Bruna, A. L. Roquemore, Federica Bonomo, F. Fantini, Lorenzo Frassinetti, C. Bustreo, Diego Marcuzzi, G. L. Delzanno, Gianluca Spizzo, A. De Lorenzi, Martin, P, Puiatti, M, Agostinetti, P, Agostini, M, Alonso, J, Antoni, V, Apolloni, L, Auriemma, F, Avino, F, Barbalace, A, Barbisan, M, Barbui, T, Barison, S, Barp, M, Baruzzo, M, Bettini, P, Bigi, M, Bilel, R, Boldrin, M, Bolzonella, T, Bonfiglio, D, Bonomo, F, Brombin, M, Buffa, A, Bustreo, C, Canton, A, Cappello, S, Carralero, D, Carraro, L, Cavazzana, R, Chacon, L, Chapman, B, Chitarin, G, Ciaccio, G, Cooper, W, Dal Bello, S, Dalla Palma, M, Delogu, R, De Lorenzi, A, Delzanno, G, De Masi, G, De Muri, M, Dong, J, Escande, D, Fantini, F, Fasoli, A, Fassina, A, Fellin, F, Ferro, A, Fiameni, S, Finn, J, Finotti, C, Fiorentin, A, Fonnesu, N, Framarin, J, Franz, P, Frassinetti, L, Furno, I, Palumbo, M, Gaio, E, Gazza, E, Ghezzi, F, Giudicotti, L, Gnesotto, F, Gobbin, M, Gonzales, W, Grando, L, Guo, S, Hanson, J, Hidalgo, C, Hirano, Y, Hirshman, S, Ide, S, In, Y, Innocente, P, Jackson, G, Kiyama, S, Liu, S, Liu, Y, Lopez Bruna, D, Lorenzini, R, Luce, T, Luchetta, A, Maistrello, A, Manduchi, G, Mansfield, D, Marchiori, G, Marconato, N, Marcuzzi, D, Marrelli, L, Martini, S, Matsunaga, G, Martines, E, Mazzitelli, G, Mccollam, K, Momo, B, Moresco, M, Munaretto, S, Novello, L, Okabayashi, M, Olofsson, E, Paccagnella, R, Pasqualotto, R, Pavei, M, Peruzzo, S, Pesce, A, Pilan, N, Piovan, R, Piovesan, P, Piron, C, Piron, L, Pomaro, N, Predebon, I, Recchia, M, Rigato, V, Rizzolo, A, Roquemore, A, Rostagni, G, Ruzzon, A, Sakakita, H, Sanchez, R, Sarff, J, Sartori, E, Sattin, F, Scaggion, A, Scarin, P, Schneider, W, Serianni, G, Sonato, P, Spada, E, Soppelsa, A, Spagnolo, S, Spolaore, M, Spong, D, Spizzo, G, Takechi, M, Taliercio, C, Terranova, D, Theiler, C, Toigo, V, Trevisan, G, Valente, M, Valisa, M, Veltri, P, Veranda, M, Vianello, N, Villone, F, Wang, Z, White, R, Xu, X, Zaccaria, P, Zamengo, A, Zanca, P, Zaniol, B, Zanotto, L, Zilli, E, Zollino, G, Zuin, M, and Mazzitelli, G.
Subjects: Nuclear and High Energy Physics, RFX-mod, Tokamak, Strong interaction, reversed field pinch, law.invention, Magnetohydrodynamics, law, RFP, Fusion, Safety factor, Reversed field pinch, Flow transport, Settore FIS/01 - Fisica Sperimentale, Iter tokamak, Fusion power, IAEA Fusion Energy Conference, Science and Technology, Condensed Matter Physics, Active control, Plasma parameter, Plasma devices, Systems engineering, Fusion devices, Magnetic configuration, Stellarator
Abstract: This paper reports the highlights of the RFX-mod fusion science programme since the last 2010 IAEA Fusion Energy Conference. The RFX-mod fusion science programme focused on two main goals: exploring the fusion potential of the reversed field pinch (RFP) magnetic configuration and contributing to the solution of key science and technology problems in the roadmap to ITER. Active control of several plasma parameters has been a key tool in this endeavour. New upgrades on the system for active control of magnetohydrodynamic (MHD) stability are underway and will be presented in this paper. Unique among the existing fusion devices, RFX-mod has been operated both as an RFP and as a tokamak. The latter operation has allowed the exploration of edge safety factor q edge < 2 with active control of MHD stability and studies concerning basic energy and flow transport mechanisms. Strong interaction has continued with the stellarator community in particular on the physics of helical states and on three-dimensional codes. © 2013 IAEA, Vienna.
Published: 2013

34. Comparison of Different RFX Operation Modes

Author: V. Antoni, L. Apolloni, M. Bagatin, W. Baker, M. Bassan, F. Bellina, A. Buffa, P. Campostrini, S. Cappello, L. Carraro, E. Casarotto, G. Chitarin, P. Collarin, S. Costa, A. De Lorenzi, D. Desideri, J.N. Di Marco, A. Donà, P. Fiorentin, E. Gaio, L. Garzotti, L. Giudicotti, F. Gnesotto, M. Gurnieri, R. Guatieri, O. Hemming, P. Innocente, P. Kusstatscher, A. Luchetta, G. Malesani, G. Manduchi, G. Marchiori, L. Marelli, P. Martin, E. Martines, S. Martini, A. Maschio, M. Moresco, A. Murari, P. O'Leary, R. Paccagnella, R. Pasqualotto, R. Piovan, N. Pomaro, M.E. Puiatti, G. Rostagni, A. Sardella, F. Sattin, P. Scarin, S. Schiavi, G. Serianni, P. Sonato, E. Spada, A. Stella, V. Toigo, L. Tramontin, F. Trevisan, M. Valisa, S. Vitturi, P. Zaccaria, E. Zilli, G. Zollino, Antoni, V, Apolloni, L, Bagatin, M, Baker, W, Bassan, M, Bellina, F, Buffa, A, Campostrini, P, Cappello, S, Carraro, L, Casarotto, E, Chitarin, G, Collarin, P, Costa, S, De Lorenzi, A, Desideri, D, Di Marco, J, Donà, A, Fiorentin, P, Gaio, E, Garzotti, L, Giudicotti, L, Gnesotto, F, Guarnieri, M, Guatieri, R, Hemming, O, Innocente, P, Kusstatscher, P, Lucchetta, A, Malesani, G, Manduchi, G, Marchiori, G, Marrelli, L, Martin, P, Martines, E, Martini, S, Maschio, A, Moresco, M, Murari, A, O'Leary, P, Paccagnella, R, Pasqualotto, R, Piovan, R, Pomaro, N, Puiatti, M, Rostagni, G, Sardella, A, Sattin, F, Scarin, P, Schiavi, A, Serianni, G, Sonato, P, Spada, E, Stella, A, Toigo, V, Tramontin, L, Trevisan, F, Valisa, M, Vitturi, S, Zaccaria, P, Zilli, E, and Zollino, G
Subjects: reversed field pinch, RFX, RFP
Published: 1995

35. Improvement of the magnetic configuration in the reversed field pinch through successive bifurcations

Author: Roberto Pasqualotto, M. Spolaore, Oliviero Barana, Francesco Gnesotto, S. Ortolani, C. Taliercio, Alberto Alfier, L. Novello, Anton Soppelsa, Pierluigi Veltri, D. Terranova, Enrico Zilli, S. Martini, Piergiorgio Sonato, Simone Peruzzo, Elena Gaio, Susanna Cappello, Piero Martin, Giuseppe Chitarin, Matteo Agostini, R. Piovan, S. Dal Bello, Vanni Toigo, D. F. Escande, Alessandro Fassina, M. Brombin, Silvia Spagnolo, V. Antoni, P. Piovesan, Paolo Bettini, Luca Grando, Rita Lorenzini, Gabriele Manduchi, Roberto Paccagnella, Paolo Scarin, N. Pomaro, Paolo Innocente, E. Gazza, Daniele Bonfiglio, Italo Predebon, Federica Bonomo, M. Baruzzo, G. De Masi, Barbara Zaniol, M. E. Puiatti, Adriano Luchetta, Lorella Carraro, Giuseppe Marchiori, Emilio Martines, Marco Gobbin, M. Valisa, G. Serianni, Paolo Franz, M. Moresco, S. C. Guo, Leonardo Giudicotti, Lionello Marrelli, Tommaso Bolzonella, A. Buffa, F. Sattin, Roberto Cavazzana, G. Rostagni, E. Spada, L. Zanotto, Fulvio Auriemma, L. Piron, N. Vianello, L. Apolloni, Alessandra Canton, Matteo Zuin, A. Pizzimenti, F. Milani, A. De Lorenzi, Diego Marcuzzi, Gianluca Spizzo, P. Zaccaria, Lorenzini, R, Agostini, M, Alfier, A, Antoni, V, Apolloni, L, Auriemma, F, Barana, O, Baruzzo, M, Bettini, P, Bonfiglio, D, Bolzonella, T, Bonomo, F, Brombin, M, Buffa, A, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Chitarin, G, Dal Bello, S, De Lorenzi, A, De Masi, G, Escande, D, Fassina, A, Franz, P, Gaio, E, Gazza, E, Giudicotti, L, Gnesotto, F, Gobbin, M, Grando, L, Guo, S, Innocente, P, Luchetta, A, Manduchi, G, Marchiori, G, Marcuzzi, D, Marrelli, L, Martin, P, Martini, S, Martines, E, Milani, F, Moresco, M, Novello, L, Ortolani, S, Paccagnella, R, Pasqualotto, R, Peruzzo, S, Piovan, R, Piovesan, P, Piron, L, Pizzimenti, A, Pomaro, N, Predebon, I, Puiatti, M, Rostagni, G, Sattin, F, Scarin, P, Serianni, G, Sonato, P, Spada, E, Soppelsa, A, Spagnolo, S, Spizzo, G, Spolaore, M, Taliercio, C, Terranova, D, Toigo, V, Valisa, M, Veltri, P, Vianello, N, Zaccaria, P, Zaniol, B, Zanotto, L, Zilli, E, and Zuin, M
Subjects: Self-organization, magnetic conﬁguration, Physics, RFX-mod, Tokamak, Reversed field pinch, MHD, magnetic confinement, Perturbation (astronomy), Saddle-node bifurcation, reversed field pinch, Plasma, Mechanics, Condensed Matter Physics, law.invention, quasi-single helicity, Nuclear magnetic resonance, Amplitude, Physics::Plasma Physics, law, bifurcation, RFP, QSH, Plasma stability, Bifurcation
Abstract: The reversed field pinch (RFP) is a magnetic configuration alternative to the tokamak that can be considered for a second generation of reactors. In this paper new remarkable results obtained in the RFP experiment RFX-mod are presented, showing that an internal transport barrier delimitates a large fraction of the plasma volume in a RFP when the current is raised to ∼1.5 MA. The formation of this transport barrier is related to a profound, spontaneous modification of the magnetic topology. Due to the occurrence of a saddle node bifurcation the plasma enters in the single helical axis state, which is theoretically known to be more resilient to chaos. This bifurcation is driven by the amplitude of the helical perturbation which dominates the mode spectrum. © 2009 American Institute of Physics.
Published: 2009

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35 results on '"Spada E"'

1. Self-organized helical equilibria as a new paradigm for ohmically heated fusion plasmas

2. First results on reversed field pinch plasmas with new magnetic boundary in the RFX-mod experiment

3. Turbulence and plasma flow self-organization in a reversed field pinch configuration

4. Features of electrostatic structures in Reversed Field Pinch edge region

5. Intermittent events and electrostatic structures in the edge region of reversed field pinch experiments

6. Bursty fluctuation events in magnetically confined plasmas: avalanche-like SOC processes or MHD turbulence?

7. Status of the RFX experiment

8. Electrostatic and magnetic structures in the edge region of RFX-mod experiment

9. Turbulent energy transfer in the RFX-Mod device

10. Fast dynamics of relaxation event in RFX-mod

11. Characterisation of the edge region of the RFX-mod device

12. Overview of the RFX fusion science program

13. Overview of RFX-mod results

14. Active MHD control at high currents in RFX-mod

15. Coherent structures and anomalous transport in reversed field pinch plasmas

16. Search of Self-Organized Criticality Processes in Magnetically Confined Plasmas: Hints from the Reversed Field Pinch Configuration

17. Confinement studies on RFX

18. Drift-Alfven vortex structures in the edge region of a fusion relevant plasma

19. Helical equilibria and magnetic structures in the reversed field pinch and analogies to the tokamak and stellarator

20. Magnetic and electrostatic structures measured in the edge region of the RFX-mod experiment

21. High current regimes in RFX-mod

22. Magnetic self organization, MHD active control and confinement in RFX-mod

23. Vortex-induced diffusivity in reversed field pinch plasmas

24. Anomalous particle transport and flow shear in the edge region of RFP's

25. Analysis and modelling of the magnetic and plasma profiles during PPCD experiments in RFX

26. Transport Processes in Reversed-Field-Pinch Plasmas: Inconsistency with the Self-Organized-Criticality Paradigm

27. Transport mechanisms and enhanced confinement studies in RFX

28. New insights into MHD dynamics of magnetically confined plasmas from experiments in RFX

29. Particle and energy transport in the RFX experiment

30. Recent Progress in RFP Research on the RFX Experiment

31. Recent progress in reversed field pinch research in the RFX experiment

32. Effect of the velocity shear on particle transport and edge turbulence in a reversed field pinch

33. Overview of the RFX-mod fusion science programme

34. Comparison of Different RFX Operation Modes

35. Improvement of the magnetic configuration in the reversed field pinch through successive bifurcations

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35 results on '"Spada E"'

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