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

Author

Puiatti, M. E., Alfier, A., Auriemma, F., Cappello, S., Carraro, L., Cavazzana, R., Dal Bello, S., Fassina, A., Escande, D. F., 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. C., Manduchi, G., Marchiori, G., Martines, E., Martini, S., Menmuir, Sheena, 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., Zanca, P., Puiatti, M. E., Alfier, A., Auriemma, F., Cappello, S., Carraro, L., Cavazzana, R., Dal Bello, S., Fassina, A., Escande, D. F., 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. C., Manduchi, G., Marchiori, G., Martines, E., Martini, S., Menmuir, Sheena, 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.

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., QC 20111216

Published
2009
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102. Overview of RFX-mod results

Author

Martin, P., Apolloni, L., Puiatti, M. E., Adamek, J., Agostini, M., Alfier, A., Annibaldi, Silvia Valeria, Antoni, V., Auriemma, F., Barana, O., Baruzzo, M., Bettini, P., Bolzonella, T., Bonfiglio, D., Bonomo, F., Brombin, M., Brotankova, J., Buffa, A., Buratti, Paolo, 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, G., 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., Zuin, M., Martin, P., Apolloni, L., Puiatti, M. E., Adamek, J., Agostini, M., Alfier, A., Annibaldi, Silvia Valeria, Antoni, V., Auriemma, F., Barana, O., Baruzzo, M., Bettini, P., Bolzonella, T., Bonfiglio, D., Bonomo, F., Brombin, M., Brotankova, J., Buffa, A., Buratti, Paolo, 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, G., 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.

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., QC 20110413

Published
2009
Full Text
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103. Improvement of the magnetic configuration in the reversed field pinch through successive bifurcations

Author

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, Zuin, M, 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 DF, Fassina A, Franz P, Gaio E, Gazza E, Giudicotti L, Gnesotto F, Gobbin M, Grando L, Guo SC, 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 ME, 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, Zuin M, 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, Zuin, M, 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 DF, Fassina A, Franz P, Gaio E, Gazza E, Giudicotti L, Gnesotto F, Gobbin M, Grando L, Guo SC, 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 ME, 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

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

104. Overview of RFX-mod results

Author

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 ME, Adamek J, Agostini M, Alfier A, Annibaldi SV, 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 BE, Chitarin G, Dal Bello S, De Lorenzi A, De Masi G, Escande DF, Fassina A, Ferro A, Franz P, Gaio E, Gazza E, Giudicotti L, Gnesotto F, Gobbin M, Grando L, Guazzotto L, Guo SC, Igochine V, Innocente P, Liu YQ, 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 JA, Rostagni G, Rubinacci G, Sarff JS, 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 RB, Yadikin D, Zaccaria P, Zamengo A, Zanca P, Zaniol B, Zanotto L, Zilli E, Zohm H, Zuin M, 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 ME, Adamek J, Agostini M, Alfier A, Annibaldi SV, 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 BE, Chitarin G, Dal Bello S, De Lorenzi A, De Masi G, Escande DF, Fassina A, Ferro A, Franz P, Gaio E, Gazza E, Giudicotti L, Gnesotto F, Gobbin M, Grando L, Guazzotto L, Guo SC, Igochine V, Innocente P, Liu YQ, 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 JA, Rostagni G, Rubinacci G, Sarff JS, 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 RB, Yadikin D, Zaccaria P, Zamengo A, Zanca P, Zaniol B, Zanotto L, Zilli E, Zohm H, and Zuin M

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

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

Author

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, Zanca, P, Puiatti ME, Alfier A, Auriemma F, Cappello S, Carraro L, Cavazzana R, Dal Bello S, Fassina A, Escande DF, 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 SC, 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, Zanca P, 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, Zanca, P, Puiatti ME, Alfier A, Auriemma F, Cappello S, Carraro L, Cavazzana R, Dal Bello S, Fassina A, Escande DF, 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 SC, 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

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

106. 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, Fassina, A, Franz, P, Gobbin, M, Innocente, P, Marrelli, L, Pasqualotto, R, Puiatti, M, Spolaore, M, Valisa, M, Vianello, N, Martin, P, 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 DF, Fassina A, Franz P, Gobbin M, Innocente P, Marrelli L, Pasqualotto R, Puiatti ME, Spolaore M, Valisa M, Vianello N, Martin P, 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, Martin, P, 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 DF, Fassina A, Franz P, Gobbin M, Innocente P, Marrelli L, Pasqualotto R, Puiatti ME, Spolaore M, Valisa M, Vianello N, and Martin P

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

107. Magnetic order and confinement improvement in high-current regimes of RFX-mod with MHD feedback control

Author

Piovesan, P, Zuin, M, Alfier, A, Bonfiglio, D, Bonomo, F, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Escande, D, Fassina, A, Gobbin, M, Lorenzini, R, Marrelli, L, Martin, P, Martines, E, Pasqualotto, R, Puiatti, M, Spolaore, M, Valisa, M, Vianello, N, Zanca, P, Piovesan P, Zuin M, Alfier A, Bonfiglio D, Bonomo F, Canton A, Cappello S, Carraro L, Cavazzana R, Escande DF, Fassina A, Gobbin M, Lorenzini R, Marrelli L, Martin P, Martines E, Pasqualotto R, Puiatti ME, Spolaore M, Valisa M, Vianello N, Zanca P, Piovesan, P, Zuin, M, Alfier, A, Bonfiglio, D, Bonomo, F, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Escande, D, Fassina, A, Gobbin, M, Lorenzini, R, Marrelli, L, Martin, P, Martines, E, Pasqualotto, R, Puiatti, M, Spolaore, M, Valisa, M, Vianello, N, Zanca, P, Piovesan P, Zuin M, Alfier A, Bonfiglio D, Bonomo F, Canton A, Cappello S, Carraro L, Cavazzana R, Escande DF, Fassina A, Gobbin M, Lorenzini R, Marrelli L, Martin P, Martines E, Pasqualotto R, Puiatti ME, Spolaore M, Valisa M, Vianello N, and Zanca P

Abstract

The RFX-mod machine (Sonato et al 2003 Fusion Eng. Des. 66 161) recently achieved, for the first time in a reversed-field pinch, high plasma current up to 1.6 MA with good confinement. Magnetic feedback control of magnetohydrodynamic instabilities was essential to reach the goal. As the current is raised, the plasma spontaneously accesses a new helical state, starting from turbulent multi-helical conditions. Together with this raise, the ratio between the dominant and the secondary mode amplitudes increases in a continuous way. This brings a significant improvement in the magnetic field topology, with the formation of helical flux surfaces in the core. As a consequence, strong helical transport barriers with maximum electron temperature around 1 keV develop in this region. The energy confinement time increases by a factor of 4 with respect to the lower-current, multi-helical conditions. The properties of the new helical state scale favourably with the current, thus opening promising perspectives for the higher current experiments planned for the near future. © 2009 IAEA, Vienna.

Published
2009

108. High current regimes in RFX-mod

Author

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, Zuin, M, Valisa M, Bolzonella T, Buratti P, Carraro L, Cavazzana R, Dal Bello S, Martin P, Pasqualotto R, Sarff JS, 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 DF, Fassina A, Franz P, Gaio E, Gazza E, Giudicotti L, Gnesotto F, Gobbin M, Grando L, Guazzotto L, Guo SC, 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 ME, 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, Zuin M, 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, Zuin, M, Valisa M, Bolzonella T, Buratti P, Carraro L, Cavazzana R, Dal Bello S, Martin P, Pasqualotto R, Sarff JS, 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 DF, Fassina A, Franz P, Gaio E, Gazza E, Giudicotti L, Gnesotto F, Gobbin M, Grando L, Guazzotto L, Guo SC, 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 ME, 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

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

111. RFX-mod: A multi-configuration fusion facility for three-dimensional physics studies

Author

Piovesan, P., primary, Bonfiglio, D., additional, Auriemma, F., additional, Bonomo, F., additional, Carraro, L., additional, Cavazzana, R., additional, De Masi, G., additional, Fassina, A., additional, Franz, P., additional, Gobbin, M., additional, Marrelli, L., additional, Martin, P., additional, Martines, E., additional, Momo, B., additional, Piron, L., additional, Valisa, M., additional, Veranda, M., additional, Vianello, N., additional, Zaniol, B., additional, Agostini, M., additional, Baruzzo, M., additional, Bolzonella, T., additional, Canton, A., additional, Cappello, S., additional, Chacón, L., additional, Ciaccio, G., additional, Escande, D. F., additional, Innocente, P., additional, Lorenzini, R., additional, Paccagnella, R., additional, Puiatti, M. E., additional, Scarin, P., additional, Soppelsa, A., additional, Spizzo, G., additional, Spolaore, M., additional, Terranova, D., additional, Zanca, P., additional, Zanotto, L., additional, and Zuin, M., additional

Published
2013
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112. A new paradigm for RFP magnetic self-organization : results and challenges

Author

Martin, P., Marrelli, L., Alfier, A., Bonomo, F., Escande, D., Franz, P., Frassinetti, Lorenzo, Gobbin, M., Pasqualotto, R., Piovesan, P., Terranova, D., Martin, P., Marrelli, L., Alfier, A., Bonomo, F., Escande, D., Franz, P., Frassinetti, Lorenzo, Gobbin, M., Pasqualotto, R., Piovesan, P., and Terranova, D.

Abstract

This paper reports the most recent experimental results on quasi-single helicity (QSH) reversed field pinch (RFP) plasmas. QSH is considered a key element towards the full experimental realization of the theoretically predicted single helicity (SH) RFP. The SH RFP, where an individual resistive kink mode and its harmonics drive the dynamo electric field, is predicted to have superior confinement performance with respect to the standard multiple helicity (MH) state. Magnetic chaos is in fact strongly reduced in the SH RFP, which therefore retains all the positive features of the RFP configuration without the problems connected with the magnetic turbulence typical of the MH scenario. Data from the RFX-mod device, presented here, provide a more complete description of QSH states, indicate a positive synergy between the growth of the dominant resistive mode and the decrease in the secondary modes (with reduction of magnetic chaos and hints of confinement improvement outside the helical domain), and showa promising scaling with plasma current. Initial experiments on active control of QSH states in RFX-mod are presented., QC 20120302

Published
2007
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113. Magnetic self organization, MHD active control and confinement in RFX-mod

Author

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, Zuin, M, 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 DF, Fassina A, Franz P, Gadani G, Gaio E, Gazza E, Giudicotti L, Gnesotto F, Grando L, Guo SC, 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 ME, 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, Zuin M, 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, Zuin, M, 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 DF, Fassina A, Franz P, Gadani G, Gaio E, Gazza E, Giudicotti L, Gnesotto F, Grando L, Guo SC, 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 ME, 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

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

115. Quasilinear transport modelling at low magnetic shear

Author

Citrin, J., primary, Bourdelle, C., additional, Cottier, P., additional, Escande, D. F., additional, Gürcan, Ö. D., additional, Hatch, D. R., additional, Hogeweij, G. M. D., additional, Jenko, F., additional, and Pueschel, M. J., additional

Published
2012
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120. Overview of quasi-single helicity experiments in reversed field pinches

Author

Martin, P., Marrelli, L., Spizzo, G., Franz, P., Piovesan, P., Predebon, I., Bolzonella, T., Cappello, S., Cravotta, A., Escande, D. F., Frassinetti, L., Ortolani, S., Paccagnella, R., Terranova, D., Chapman, B. E., Craig, D., Prager, S. C., Sarff, J. S., Brunsell, P., Malmberg, J. A., Drake, James R., Yagi, Y., Koguchi, H., Hirano, Y., White, R. B., Sovinec, C., Xiao, C., Nebel, R. A., Schnack, D. D., Martin, P., Marrelli, L., Spizzo, G., Franz, P., Piovesan, P., Predebon, I., Bolzonella, T., Cappello, S., Cravotta, A., Escande, D. F., Frassinetti, L., Ortolani, S., Paccagnella, R., Terranova, D., Chapman, B. E., Craig, D., Prager, S. C., Sarff, J. S., Brunsell, P., Malmberg, J. A., Drake, James R., Yagi, Y., Koguchi, H., Hirano, Y., White, R. B., Sovinec, C., Xiao, C., Nebel, R. A., and Schnack, D. D.

Abstract

QC 20100525 NR 20140804

Published
2003
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121. Analysis and modelling of the magnetic and plasma profiles during PPCD experiments in RFX

Author

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, Zuin, M, Puiatti ME, Cappello S, Lorenzini R, Martini S, Ortolani S, Paccagnella R, Sattin F, Terranova A, Bolzonella T, Buffa A, Canton A, Carraro L, Escande DF, 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 SC, 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, Zuin M, 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, Zuin, M, Puiatti ME, Cappello S, Lorenzini R, Martini S, Ortolani S, Paccagnella R, Sattin F, Terranova A, Bolzonella T, Buffa A, Canton A, Carraro L, Escande DF, 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 SC, 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

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

122. [Positive inotropic and lusitropic effect of RP 62719, a new class III antiarrhythmia agent]

Author

Jp, Beregi, Escande D, Coudray N, Denis CHEMLA, Mestre M, Péry N, and Lecarpentier Y

Subjects
Heart Failure, Male, Potassium Channels, Piperidines, Isometric Contraction, Guinea Pigs, Animals, Humans, Isotonic Contraction, Chromans, Papillary Muscles, Anti-Arrhythmia Agents, Myocardial Contraction
Abstract

Antiarrhythmic drugs, especially the Class I family, exert a negative inotropic effect on the myocardium which is particularly undesirable in patients with depressed left ventricular function. Therefore, research has been directed to the development of new, more specific molecules of the Class III family. The authors studies the mechanical effects of RP 62719 on guinea pig left ventricular papillary muscle. This new molecule is a pure Class III antiarrhythmic, known to lengthen the duration of the cardiac action potential by selectively blocking the potassium current iK1 (inward rectifier K+ current). The mechanical parameters were determined during the phases of contraction and relaxation under isotonic and isometric conditions. At 0.2 and 2 microM concentrations, RP 62719 improved cardiac contraction under both isotonic and isometric conditions with an increase of about 30% of Vmax (p0.001), the maximum unloaded shortening velocity delta 1 (p0.001), the peak isometric active force normalized per cross-sectional area [AF/S (p0.001)]. At these two concentrations, a positive lusitropic effect (improved relaxation) was demonstrated by an increase in negative peak of derivative per mm2-dF/s and maximum lengthening velocity VR max (p0.01). At higher concentrations (20 microM), the inotropic and lusitropic effects were less marked with a bell-shaped form of the dose-effect curve. This study indicates that RP 62719 has moderate but significant positive inotropic and lusitropic effects. These actions could provide significant therapeutic advantages especially in patients cardiac failure.

Published
1994

125. Overview of quasi single helicity experiments in reversed field pinches

Author

Martin, P, Marrelli, L, Spizzo, G, Franz, P, Piovesan, P, Predebon, I, Bolzonella, T, Cappello, S, Cravotta, A, Escande, D F, Frassinetti, L, Ortolani, S, Paccagnella, R, Terranova, D, Chapman, B E, Craig, D, Prager, S C, Sarff, J S, Brunsell, P, Malmberg, J-A, Drake, J R, Yagi, Y, Koguchi, H, Hirano, Y, White, R B, Sovinec, C, Xiao, C, Nebel, R A, Schnack, D D, Martin, P, Marrelli, L, Spizzo, G, Franz, P, Piovesan, P, Predebon, I, Bolzonella, T, Cappello, S, Cravotta, A, Escande, D F, Frassinetti, L, Ortolani, S, Paccagnella, R, Terranova, D, Chapman, B E, Craig, D, Prager, S C, Sarff, J S, Brunsell, P, Malmberg, J-A, Drake, J R, Yagi, Y, Koguchi, H, Hirano, Y, White, R B, Sovinec, C, Xiao, C, Nebel, R A, and Schnack, D D

Abstract

NR 20140805

Published
2002

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

Author

Puiatti, M E, primary, Alfier, A, additional, Auriemma, F, additional, Cappello, S, additional, Carraro, L, additional, Cavazzana, R, additional, Dal Bello, S, additional, Fassina, A, additional, Escande, D F, additional, Franz, P, additional, Gobbin, M, additional, Innocente, P, additional, Lorenzini, R, additional, Marrelli, L, additional, Martin, P, additional, Piovesan, P, additional, Predebon, I, additional, Sattin, F, additional, Spizzo, G, additional, Terranova, D, additional, Valisa, M, additional, Zaniol, B, additional, Zanotto, L, additional, Zuin, M, additional, Agostini, M, additional, Antoni, V, additional, Apolloni, L, additional, Baruzzo, M, additional, Bolzonella, T, additional, Bonfiglio, D, additional, Bonomo, F, additional, Boozer, A, additional, Brombin, M, additional, Canton, A, additional, Delogu, R, additional, De Masi, G, additional, Gaio, E, additional, Gazza, E, additional, Giudicotti, L, additional, Grando, L, additional, Guo, S C, additional, Manduchi, G, additional, Marchiori, G, additional, Martines, E, additional, Martini, S, additional, Menmuir, S, additional, Momo, B, additional, Moresco, M, additional, Munaretto, S, additional, Novello, L, additional, Paccagnella, R, additional, Pasqualotto, R, additional, Piovan, R, additional, Piron, L, additional, Pizzimenti, A, additional, Pomphrey, N, additional, Scarin, P, additional, Serianni, G, additional, Spada, E, additional, Soppelsa, A, additional, Spagnolo, S, additional, Spolaore, M, additional, Taliercio, C, additional, Vianello, N, additional, Zamengo, A, additional, and Zanca, P, additional

Published
2009
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127. Improvement of the magnetic configuration in the reversed field pinch through successive bifurcations

Author

Lorenzini, R., primary, Agostini, M., additional, Alfier, A., additional, Antoni, V., additional, Apolloni, L., additional, Auriemma, F., additional, Barana, O., additional, Baruzzo, M., additional, Bettini, P., additional, Bonfiglio, D., additional, Bolzonella, T., additional, Bonomo, F., additional, Brombin, M., additional, Buffa, A., additional, Canton, A., additional, Cappello, S., additional, Carraro, L., additional, Cavazzana, R., additional, Chitarin, G., additional, Dal Bello, S., additional, De Lorenzi, A., additional, De Masi, G., additional, Escande, D. F., additional, Fassina, A., additional, Franz, P., additional, Gaio, E., additional, Gazza, E., additional, Giudicotti, L., additional, Gnesotto, F., additional, Gobbin, M., additional, Grando, L., additional, Guo, S. C., additional, Innocente, P., additional, Luchetta, A., additional, Manduchi, G., additional, Marchiori, G., additional, Marcuzzi, D., additional, Marrelli, L., additional, Martin, P., additional, Martini, S., additional, Martines, E., additional, Milani, F., additional, Moresco, M., additional, Novello, L., additional, Ortolani, S., additional, Paccagnella, R., additional, Pasqualotto, R., additional, Peruzzo, S., additional, Piovan, R., additional, Piovesan, P., additional, Piron, L., additional, Pizzimenti, A., additional, Pomaro, N., additional, Predebon, I., additional, Puiatti, M. E., additional, Rostagni, G., additional, Sattin, F., additional, Scarin, P., additional, Serianni, G., additional, Sonato, P., additional, Spada, E., additional, Soppelsa, A., additional, Spagnolo, S., additional, Spizzo, G., additional, Spolaore, M., additional, Taliercio, C., additional, Terranova, D., additional, Toigo, V., additional, Valisa, M., additional, Veltri, P., additional, Vianello, N., additional, Zaccaria, P., additional, Zaniol, B., additional, Zanotto, L., additional, Zilli, E., additional, and Zuin, M., additional

Published
2009
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129. High current regimes in RFX-mod

Author

Valisa, M, primary, Bolzonella, T, additional, Buratti, P, additional, Carraro, L, additional, Cavazzana, R, additional, Dal Bello, S, additional, Martin, P, additional, Pasqualotto, R, additional, Sarff, J S, additional, Spolaore, M, additional, Zanca, P, additional, Zanotto, L, additional, Agostini, M, additional, Alfier, A, additional, Antoni, V, additional, Apolloni, L, additional, Auriemma, F, additional, Barana, O, additional, Baruzzo, M, additional, Bettini, P, additional, Bonfiglio, D, additional, Bonomo, F, additional, Brombin, M, additional, Buffa, A, additional, Canton, A, additional, Cappello, S, additional, Cavinato, M, additional, Chitarin, G, additional, De Lorenzi, A, additional, De Masi, G, additional, Escande, D F, additional, Fassina, A, additional, Franz, P, additional, Gaio, E, additional, Gazza, E, additional, Giudicotti, L, additional, Gnesotto, F, additional, Gobbin, M, additional, Grando, L, additional, Guazzotto, L, additional, Guo, S C, additional, Igochine, V, additional, Innocente, P, additional, Lorenzini, R, additional, Luchetta, A, additional, Manduchi, G, additional, Marchiori, G, additional, Marcuzzi, D, additional, Marrelli, L, additional, Martini, S, additional, Martines, E, additional, McCollam, K, additional, Milani, F, additional, Moresco, M, additional, Novello, L, additional, Ortolani, S, additional, Paccagnella, R, additional, Peruzzo, S, additional, Piovan, R, additional, Piron, L, additional, Pizzimenti, A, additional, Piovesan, P, additional, Pomaro, N, additional, Predebon, I, additional, Puiatti, M E, additional, Rostagni, G, additional, Sattin, F, additional, Scarin, P, additional, Serianni, G, additional, Sonato, P, additional, Spada, E, additional, Soppelsa, A, additional, Spagnolo, S, additional, Spizzo, G, additional, Taliercio, C, additional, Terranova, D, additional, Toigo, V, additional, Vianello, N, additional, Yadikin, D, additional, Zaccaria, P, additional, Zaniol, B, additional, Zilli, E, additional, and Zuin, M, additional

Published
2008
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131. Quasi-single-helicity reversed-field-pinch plasmas

Author

Escande, D, Martin, P, Ortolani, S, Buffa, A, Franz, P, Marrelli, L, Martines, E, Spizzo, G, Cappello, S, Murari, A, Pasqualotto, R, Zanca, P, Escande DF, Martin P, Ortolani S, Buffa A, Franz P, Marrelli L, Martines E, Spizzo G, Cappello S, Murari A, Pasqualotto R, Zanca P, Escande, D, Martin, P, Ortolani, S, Buffa, A, Franz, P, Marrelli, L, Martines, E, Spizzo, G, Cappello, S, Murari, A, Pasqualotto, R, Zanca, P, Escande DF, Martin P, Ortolani S, Buffa A, Franz P, Marrelli L, Martines E, Spizzo G, Cappello S, Murari A, Pasqualotto R, and Zanca P

Abstract

The reversed field pinch (RFP), a configuration for plasma magnetic confinement was initially viewed as dominated by magnetohydrodynamic (MHD) instabilities producing magnetic chaos and high energy transport. Experiments showed that in case of plasmas where imaging and temperature profile were provided for the first time, there was a decrease of magnetic chaos and the formation of coherent helical structure.

Published
2000

132. Quasi-single helicity states in the reversed field pinch: Beyond the standard paradigm

Author

Martin, P, Buffa, A, Cappello, S, D'Angelo, F, Escande, D, Franz, P, Marrelli, L, Martines, E, Ortolani, S, Spizzo, G, Bilato, R, Bolzonella, T, Costa, S, Murari, A, Paccagnella, R, Pasqualotto, R, Terranova, D, Zanca, P, Martin P, Buffa A, Cappello S, D'Angelo F, Escande DF, Franz P, Marrelli L, Martines E, Ortolani S, Spizzo G, Bilato R, Bolzonella T, Costa S, Murari A, Paccagnella R, Pasqualotto R, Terranova D, Zanca P, Martin, P, Buffa, A, Cappello, S, D'Angelo, F, Escande, D, Franz, P, Marrelli, L, Martines, E, Ortolani, S, Spizzo, G, Bilato, R, Bolzonella, T, Costa, S, Murari, A, Paccagnella, R, Pasqualotto, R, Terranova, D, Zanca, P, Martin P, Buffa A, Cappello S, D'Angelo F, Escande DF, Franz P, Marrelli L, Martines E, Ortolani S, Spizzo G, Bilato R, Bolzonella T, Costa S, Murari A, Paccagnella R, Pasqualotto R, Terranova D, and Zanca P

Abstract

This paper reports experimental results showing that coherent helical structures are formed in the reversed field pinch (RFP) self-organizing plasma core as a result of transitions to states where the n-spectrum of the m=1 modes is dominated by a single (1,n(max)) geometrical helicity. These states are dubbed quasi-single helicity (QSH) states. Their magnetic and thermal properties measured in the reverse field experiment (RFX) [G. Rostagni, Fusion Eng. Des. 25, 301 (1995)] device are described. The present theoretical understanding of QSH states is discussed and some recent theoretical results are presented. The role of aspect ratio is discussed. These results represent a significant step to open a path beyond the standard paradigm that a bath of magnetohydrodynamic (MHD) modes is intrinsic to the RFP.

Published
2000

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

Author

Marrelli, L, primary, Zanca, P, additional, Valisa, M, additional, Marchiori, G, additional, Alfier, A, additional, Bonomo, F, additional, Gobbin, M, additional, Piovesan, P, additional, Terranova, D, additional, Agostini, M, additional, Alessi, C, additional, Antoni, V, additional, Apolloni, L, additional, Auriemma, F, additional, Barana, O, additional, Bettini, P, additional, Bolzonella, T, additional, Bonfiglio, D, additional, Brombin, M, additional, Buffa, A, additional, Canton, A, additional, Cappello, S, additional, Carraro, L, additional, Cavazzana, R, additional, Cavinato, M, additional, Chitarin, G, additional, Dal Bello, S, additional, De Lorenzi, A, additional, Escande, D F, additional, Fassina, A, additional, Franz, P, additional, Gadani, G, additional, Gaio, E, additional, Gazza, E, additional, Giudicotti, L, additional, Gnesotto, F, additional, Grando, L, additional, Guo, S C, additional, Innocente, P, additional, Lorenzini, R, additional, Luchetta, A, additional, Malesani, G, additional, Manduchi, G, additional, Marcuzzi, D, additional, Martin, P, additional, Martini, S, additional, Martines, E, additional, Masiello, A, additional, Milani, F, additional, Moresco, M, additional, Murari, A, additional, Novello, L, additional, Ortolani, S, additional, Paccagnella, R, additional, Pasqualotto, R, additional, Peruzzo, S, additional, Piovan, R, additional, Pizzimenti, A, additional, Pomaro, N, additional, Predebon, I, additional, Puiatti, M E, additional, Rostagni, G, additional, Sattin, F, additional, Scarin, P, additional, Serianni, G, additional, Sonato, P, additional, Spada, E, additional, Soppelsa, A, additional, Spizzo, G, additional, Spolaore, M, additional, Taccon, C, additional, Taliercio, C, additional, Toigo, V, additional, Vianello, N, additional, Zaccaria, P, additional, Zaniol, B, additional, Zanotto, L, additional, Zilli, E, additional, Zollino, G, additional, and Zuin, M, additional

Published
2007
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137. Stationary quasi single helicity states in RFX

Author

Pick, RM, Bastian, C, Schweer, B, Van Oost, G, Vietzke, E, Cappello, S, Escande, D, Marrelli, L, Martin, P, Martines, E, Ortolani, S, Spizzo, G, Terranova, D, Zanca, P, Cappello S, Escande DF, Marrelli L, Martin P, Martines E, Ortolani S, Spizzo G, Terranova D, Zanca P, Pick, RM, Bastian, C, Schweer, B, Van Oost, G, Vietzke, E, Cappello, S, Escande, D, Marrelli, L, Martin, P, Martines, E, Ortolani, S, Spizzo, G, Terranova, D, Zanca, P, Cappello S, Escande DF, Marrelli L, Martin P, Martines E, Ortolani S, Spizzo G, Terranova D, and Zanca P

Published
1999

142. Potassium accumulation in the globally ischemic mammalian heart. A role for the ATP-sensitive potassium channel

Author

Wilde, A. A., Escande, D., Schumacher, C. A., Thuringer, D., Mestre, M., Fiolet, J. W., Janse, M. J., and Other departments

Abstract

We investigated the contribution of opening of the ATP-sensitive K+ channel to extracellular accumulation of K+ during ischemia with the use of glibenclamide, a specific blocker of this K+ channel. To characterize the electrophysiological effects of glibenclamide during metabolic inhibition (by either application of dinitrophenol or hypoxia) we performed patch-clamp studies in isolated membrane patches of guinea pig myocytes and in intact guinea pig myocytes and studied action potential parameters in isolated superfused guinea pig papillary muscle. We studied the effect of glibenclamide on extracellular accumulation of K+ and H+ in isolated retrogradely perfused globally ischemic hearts of rat, guinea pig, and rabbit. Experimental evidence is presented that supports the conclusions that glibenclamide 1) effectively blocks open K+ATP channels, 2) reverses the dinitrophenol-induced increase of the outward current and prevents the hypoxia-induced shortening of the action potential, 3) decreases the rate of K+ accumulation during the first minutes of ischemia in stimulated hearts, an effect which was entirely absent in quiescent hearts, and 4) does not influence the rate and extent of ischemia-induced extracellular acidification

Published
1990

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