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Start Over Author "Agostini, M." Journal plasma physics and controlled fusion
21 results on '"Agostini, M."'

2. Magnetic perturbations as a viable tool for edge turbulence modification

Author

Vianello N., Rea C., Agostini M., Cavazzana R., Ciaccio G., De Masi G., Martines E., Mazzi A., Momo B., Spizzo G., Scarin P., Spolaore M., Zanca P., Zuin M., Carraro L., Innocente P., Marrelli L., Puiatti M. E., Terranova D., the RFX-mod Team, Vianello, N, Rea, C, Agostini, M, Cavazzana, R, Ciaccio, G, De Masi, G, Martines, E, Mazzi, A, Momo, B, Spizzo, G, Scarin, P, Spolaore, M, Zanca, P, Zuin, M, Carraro, L, Innocente, P, Marrelli, L, Puiatti, M, and Terranova, D

Subjects
Physics, Safety factor, Tokamak, Reversed field pinch, Turbulence, business.industry, turbulence, Perturbation (astronomy), RMP, Condensed Matter Physics, 01 natural sciences, 010305 fluids & plasmas, Computational physics, Magnetic field, law.invention, electric field, Optics, Nuclear Energy and Engineering, law, Physics::Plasma Physics, 0103 physical sciences, Magnetohydrodynamics, 010306 general physics, business, Phenomenology (particle physics)
Abstract

A complete description of the effects of magnetic perturbation on the edge region of RFX-mod is here reported. The flexibility of the RFX-mod device [1] allows for the operation of the machine both as a reversed field pinch (RFP, with maximum current 2 MA) and as a low-current, circular ohmic tokamak (I-p,I-max = 0.15 MA). The present paper summarizes the most recent results obtained in both configurations with either spontaneous or induced edge radial magnetic perturbation. Emphasis will be devoted to the experimental characterization of the edge flow, focusing on the phase relation between flow and perturbed magnetic field. These informations are provided for natural and stimulated helical discharges in RFPs, and for tokamak safely operated, thanks to the unique RFX-mod MHD control system, in a wide range of edge safety factor 1.9 less than or similar to q(a)

Published
2015
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4. Magnetic perturbations as a viable tool for edge turbulence modification

Author

Vianello, N, primary, Rea, C, additional, Agostini, M, additional, Cavazzana, R, additional, Ciaccio, G, additional, De Masi, G, additional, Martines, E, additional, Mazzi, A, additional, Momo, B, additional, Spizzo, G, additional, Scarin, P, additional, Spolaore, M, additional, Zanca, P, additional, Zuin, M, additional, Carraro, L, additional, Innocente, P, additional, Marrelli, L, additional, Puiatti, M E, additional, and Terranova, D, additional

Published
2014
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8. A 3D approach to equilibrium, stability and transport studies in RFX-mod improved regimes

Author

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

Published
2010
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9. 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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12. On the statistics of edge fluctuations: comparative study between various fusion devices

Author

Sattin, F, primary, Agostini, M, additional, Scarin, P, additional, Vianello, N, additional, Cavazzana, R, additional, Marrelli, L, additional, Serianni, G, additional, Zweben, S J, additional, Maqueda, R J, additional, Yagi, Y, additional, Sakakita, H, additional, Koguchi, H, additional, Kiyama, S, additional, Hirano, Y, additional, and Terry, J L, additional

Published
2009
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13. 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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14. MHD instabilities in magneto-plasma-dynamic thrusters

Author

Paganucci, F, primary, Zuin, M, additional, Agostini, M, additional, Andrenucci, M, additional, Antoni, V, additional, Bagatin, M, additional, Bonomo, F, additional, Cavazzana, R, additional, Franz, P, additional, Marrelli, L, additional, Martin, P, additional, Martines, E, additional, Rossetti, P, additional, Serianni, G, additional, Scarin, P, additional, Signori, M, additional, and Spizzo, G, additional

Published
2008
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17. 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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20. On the statistics and features of turbulent structures in RFX-mod

Author

Matteo Agostini, M. Zuin, Emilio Martines, Silvia Spagnolo, P. Scarin, B. Momo, G. De Masi, N. Vianello, Roberto Cavazzana, Monica Spolaore, Vianello, N, Spolaore, M, Agostini, M, Cavazzana, R, De Masi, G, Martines, E, Momo, B, Scarin, P, Spagnolo, S, and Zuin, M

Subjects
Tokamak, Similarity (geometry), K-epsilon turbulence model, blobs, reversed field pinch, Enstrophy, 01 natural sciences, 010305 fluids & plasmas, law.invention, Physics::Fluid Dynamics, Physics::Plasma Physics, law, 0103 physical sciences, Statistical physics, 010306 general physics, tokamak, Physics, Reversed field pinch, Turbulence, blob, turbulence, Condensed Matter Physics, Computational physics, Nonlinear Sciences::Chaotic Dynamics, Nuclear Energy and Engineering, Beta (plasma physics), Energy (signal processing)
Abstract

An extensive statistical characterization of the electromagnetic turbulence in the edge region of RFX-mod, operated as a tokamak and as a Reversed Field Pinch, is presented. Striking similarity are observed on the intermittent character of the electrostatic turbulence between the two configurations whereas the difference between magnetic turbulence is likely to be imputed to the different beta value of the two configurations. Blobs are characterized in terms of their spatial structure, the associated enstrophy and energy and the mechanism of energy and enstrophy transfer between intermittent fluctuation at different scales is addressed.

Published
2016
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21. Neutral density estimation in the ASDEX upgrade divertor from deuterium emissivity measurements during detachment and shoulder formation

Author

M. Spolaore, N. Vianello, E. Wolfrum, M. Cavedon, Volker Naulin, Daniel Carralero, R. Dux, Matteo Agostini, Lorella Carraro, ASDEX Upgrade Team, Max Planck Institute for Plasma Physics, Max Planck Society, EUROfusion MST1 Team, Agostini, M, Vianello, N, Carraro, L, Carralero, D, Cavedon, M, Dux, R, Naulin, V, Spolaore, M, and Wolfrum, E

Subjects
Materials science, Divertor, plasma edge, Condensed Matter Physics, 01 natural sciences, 010305 fluids & plasmas, Plasma edge, Nuclear physics, Nuclear Energy and Engineering, ASDEX Upgrade, Deuterium, ASDEX upgrade, 0103 physical sciences, detachment, Emissivity, shoulder formation, 010306 general physics, Neutral density filter
Abstract

Neutral density distribution in the divertor region of ASDEX Upgrade is estimated in different discharge conditions. The 2D divertor emission of D-alpha and D-gamma is obtained with a tomographic inversion of their brightness measured by two cameras. From these emissions, 2D maps of neutrals density n(0) can be obtained by a simple model that takes into account both excitation and recombination processes populating deuterium n = 3 and n = 5 levels. In attached discharges, the neutral density n(0) is larger in the inner divertor, and when increasing core n(e) its maximum moves toward the dome and the outer divertor region. In particular, the modification of the n(0) distribution is studied in plasmas where the mean electron density in the core increases, moving from an attached to a detached phase. In these discharges, the outboard midplane scrape off layer electron density increases and its profile flattens, with the formation of the so called density shoulder. The modification of the neutral density is followed during this evolution, showing that both the shape and the absolute value of the n(0) distribution change in time, suggesting that they play a role in the two phenomena of shoulder formation and detachment. Moreover, in the detached phase, also the recombination contributes to the neutral deuterium emission.

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