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11 results on '"Malesani G"'

1. 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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

11. 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

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