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239 results on '"Briguglio, S"'

2. Linear gyrokinetic particle-in-cell simulations of Alfven instabilities in tokamaks

Author

Biancalani, A., Bottino, A., Briguglio, S., Koenies, A., Lauber, Ph., Mishchenko, A., Poli, E., Scott, B. D., and Zonca, F.

Subjects
Physics - Plasma Physics
Abstract

The linear dynamics of Alfven modes in tokamaks is investigated here by means of the global gyrokinetic particle-in-cell code NEMORB. The model equations are shown and the local shear Alfven wave dispersion relation is derived, recovering the continuous spectrum in the incompressible ideal MHD limit. A verification and benchmark analysis is performed for continuum modes in a cylinder and for toroidicity-induced Alfven Eigenmodes. Modes in a reversed-shear equilibrium are also investigated, and the dependence of the spatial structure in the poloidal plane on the equilibrium parameters is described. In particular, a phase-shift in the poloidal angle is found to be present for modes whose frequency touches the continuum, whereas a radial symmetry is found to be characteristic of modes in the continuum gap., Comment: Submitted to "Physics of Plasmas"

Published
2015
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3. Nonlinear dynamics of beta induced Alfv\'en eigenmode driven by energetic particles

Author

Wang, X., Briguglio, S., Chen, L., Fogaccia, G., Di Troia, C., Vlad, G., and Zonca, F.

Subjects
Physics - Plasma Physics
Abstract

Nonlinear saturation of beta induced Alfv\'en eigenmode, driven by slowing down energetic particles via transit resonance, is investigated by the nonlinear hybrid magnetohyrodynamic gyro-kinetic code (XHMGC). Saturation is characterized by frequency chirping and symmetry breaking between co- and counter-passing particles, which can be understood as the the evidence of resonance-detuning. The scaling of the saturation amplitude with the growth rate is also demonstrated to be consistent with radial resonance detuning due to the radial non-uniformity and mode structure.

Published
2012
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4. An extended hybrid magnetohydrodynamics gyrokinetic model for numerical simulation of shear Alfv\'en waves in burning plasmas

Author

Wang, X, Briguglio, S, Chen, L, Di Troia, C, Fogaccia, G, Vlad, G, and Zonca, F

Subjects
Physics - Plasma Physics
Abstract

Adopting the theoretical framework for the generalized fishbonelike dispersion relation, an extended hybrid magnetohydrodynamics gyrokinetic simulation model has been derived analytically by taking into account both thermal ion compressibility and diamagnetic effects in addition to energetic particle kinetic behaviors. The extended model has been used for implementing an eXtended version of Hybrid Magnetohydrodynamics Gyrokinetic Code (XHMGC) to study thermal ion kinetic effects on Alfv\'enic modes driven by energetic particles, such as kinetic beta induced Alfv\'en eigenmodes in tokamak fusion plasmas.

Published
2010
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5. Particle simulation of energetic particle driven Alfvén modes in NBI heated DIII-D experiments

Author

Vlad, G, Briguglio, S, Fogaccia, G, Zonca, F, Troia, CD, Heidbrink, WW, Van Zeeland, MA, Bierwage, A, and Wang, X

Subjects
Fluids & Plasmas, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

The mutual nonlinear interactions of shear Alfvén modes and alpha particles can enhance their transport in burning plasmas. Theoretical and numerical works have shown that rapid transport of energetic ions can take place because of fast growing Alfvén modes (e.g. energetic particle driven modes, EPMs). This kind of transport has been observed in experiments as well as in numerical simulations. Hybrid MHD-gyrokinetic codes can investigate linear and nonlinear dynamics of energetic particle (EP) driven modes, retaining the mutual interaction between waves and EPs self-consistently. Self-consistent nonlinear wave-particle interactions (both in configuration and velocity space) are crucial for a correct description of the mode dynamics in the case of strongly driven modes; thus, a non-perturbative approach is mandatory. The knowledge of the threshold characterizing the transition from weakly to strongly driven regimes is of primary importance for burning plasma operations (e.g. for ITER), in order to avoid EPM enhanced EP transport regimes. The hybrid MHD-gyrokinetic code (HMGC) has been applied to the interpretation of phenomena observed in present experiments with neutral beam (NB) heating. In reversed-shear beam-heated DIII-D discharges, a large discrepancy between the expected and measured EP radial density profiles has been observed in the presence of large Alfvénic activity. HMGC simulations with EP radial profiles expected from classical NB deposition as input give rise to strong EPM activity, resulting in relaxed EP radial profiles at saturation level close to experimental measurements. The frequency spectra obtained from several simulations with different toroidal mode numbers, as calculated during the saturated phase when the strong EPMs transform in weak reversed-shear Alfvén modes, are quite close to experimental observations both in absolute frequency and in radial localization. In this work, we discuss in particular the effects of nonlinear coupling between different toroidal mode numbers. © 2009 IAEA, Vienna.

Published
2009

6. Chapter 5: Physics of energetic ions

Author

Fasoli, A, Gormenzano, C, Berk, HL, Breizman, B, Briguglio, S, Darrow, DS, Gorelenkov, N, Heidbrink, WW, Jaun, A, Konovalov, SV, Nazikian, R, Noterdaeme, J-M, Sharapov, S, Shinohara, K, Testa, D, Tobita, K, Todo, Y, Vlad, G, and Zonca, F

Subjects
Atomic, Molecular, Nuclear, Particle and Plasma Physics, Fluids & Plasmas
Abstract

This chapter reviews the progress accomplished since the redaction of the first ITER Physics Basis (1999 Nucl. Fusion 39 2137-664) in the field of energetic ion physics and its possible impact on burning plasma regimes. New schemes to create energetic ions simulating the fusion-produced alphas are introduced, accessing experimental conditions of direct relevance for burning plasmas, in terms of the Alfvénic Mach number and of the normalised pressure gradient of the energetic ions, though orbit characteristics and size cannot always match those of ITER. Based on the experimental and theoretical knowledge of the effects of the toroidal magnetic field ripple on direct fast ion losses, ferritic inserts in ITER are expected to provide a significant reduction of ripple alpha losses in reversed shear configurations. The nonlinear fast ion interaction with kink and tearing modes is qualitatively understood, but quantitative predictions are missing, particularly for the stabilisation of sawteeth by fast particles that can trigger neoclassical tearing modes. A large database on the linear stability properties of the modes interacting with energetic ions, such as the Alfvén eigenmode has been constructed. Comparisons between theoretical predictions and experimental measurements of mode structures and drive/damping rates approach a satisfactory degree of consistency, though systematic measurements and theory comparisons of damping and drive of intermediate and high mode numbers, the most relevant for ITER, still need to be performed. The nonlinear behaviour of Alfvén eigenmodes close to marginal stability is well characterized theoretically and experimentally, which gives the opportunity to extract some information on the particle phase space distribution from the measured instability spectral features. Much less data exists for strongly unstable scenarios, characterised by nonlinear dynamical processes leading to energetic ion redistribution and losses, and identified in nonlinear numerical simulations of Alfvén eigenmodes and energetic particle modes. Comparisons with theoretical and numerical analyses are needed to assess the potential implications of these regimes on burning plasma scenarios, including in the presence of a large number of modes simultaneously driven unstable by the fast ions. © 2007 IAEA, Vienna.

Published
2007

7. Numerical tools for burning plasmas

Author

Mishchenko, A, primary, Biancalani, A, additional, Borchardt, M, additional, Bottino, A, additional, Briguglio, S, additional, Dumont, R, additional, Ferreira, J, additional, Graves, J P, additional, Hayward-Schneider, T, additional, Kleiber, R, additional, Könies, A, additional, Lanti, E, additional, Lauber, Ph, additional, Leyh, H, additional, Lu, Z X, additional, Lütjens, H, additional, McMillan, B, additional, Campos Pinto, M, additional, Poli, E, additional, Rettino, B, additional, Rofman, B, additional, Sama, J N, additional, Slaby, C, additional, Vannini, F, additional, Villard, L, additional, Vlad, G, additional, Wang, X, additional, Widmer, F, additional, and Zonca, F, additional

Published
2023
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11. Overview of the FTU results

Author

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

Published
2022
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14. A linear benchmark between HYMAGYC, MEGA and ORB5 codes using the NLED-AUG test case to study Alfvénic modes driven by energetic particles

Author

Vlad, G., primary, Wang, X., additional, Vannini, F., additional, Briguglio, S., additional, Carlevaro, N., additional, Falessi, M. V., additional, Fogaccia, G., additional, Fusco, V., additional, Zonca, F., additional, Biancalani, A., additional, Bottino, A., additional, Hayward-Schneider, T., additional, and Lauber, Ph., additional

Published
2021
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15. Benchmark of gyrokinetic, kinetic MHD and gyrofluid codes for the linear calculation of fast particle driven TAE dynamics

Author

Könies, Axel, BRIGUGLIO, S., GORELEKOV, Nikolai, Fehér, T., ISAEV, M., LAUBER, PH., MISHCHENKO, Alexey, SPONG, Donald A., TODO, Yasushi, COOPER, Wilfred A., HATZKY, Roman, Kleiber, Ralf, BORCHARDT, M., VLAD, G., BIANCALANI, Alessandro, BOTTINO, A., ITPA, EP TG, Könies, Axel, BRIGUGLIO, S., GORELEKOV, Nikolai, Fehér, T., ISAEV, M., LAUBER, PH., MISHCHENKO, Alexey, SPONG, Donald A., TODO, Yasushi, COOPER, Wilfred A., HATZKY, Roman, Kleiber, Ralf, BORCHARDT, M., VLAD, G., BIANCALANI, Alessandro, BOTTINO, A., and ITPA, EP TG

Abstract

Fast particles in fusion plasmas may drive Alfvén modes unstable leading to fluctuations of the internal electromagnetic fields and potential loss of particles. Such instabilities can have an impact on the performance and the wall-load of machines with burning plasmas such as ITER. A linear benchmark for a toroidal Alfvén eigenmode (TAE) is done with 11 participating codes with a broad variation in the physical as well as the numerical models. A reasonable agreement of around 20% has been found for the growth rates. Also, the agreement of the eigenfunctions and mode frequencies is satisfying. However, they are found to depend strongly on the complexity of the used model., source:Citation A. Könies et al 2018 Nucl. Fusion 58 126027, source:https://doi.org/10.1088/1741-4326/aae4e6, identifier:0000-0003-4306-9000

Published
2021

16. Overview of the FTU results

Author

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

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

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

Published
2019

23. Overview of the FTU results

Author

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

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

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

Published
2017

27. Saturation of single toroidal number Alfvén modes

Author

Briguglio, S. and Briguglio, S.

Subjects
Alfvn waves, Magnetohydradynamics, Nonlinear saturation, Fast particle, Gyrokinetic, Alfvn wave, Magnetohydradynamic
Abstract

The results of numerical simulations are presented to illustrate the saturation mechanism of a single toroidal number Alfvén mode, driven unstable, in a tokamak plasma, by the resonant interaction with energetic ions. The effects of equilibrium geometry non-uniformities and finite mode radial width on the wave-particle nonlinear dynamics are discussed. Saturation occurs as the fast-ion density flattening produced by the radial flux associated to the resonant particles captured in the potential well of the Alfvén wave extends over the whole region where mode-particle power exchange can take place. The occurrence of two different saturation regimes is shown. In the first regime, dubbed resonance detuning, that region is limited by the resonance radial width (that is, the width of the region where the fast-ion resonance frequency matches the mode frequency). In the second regime, called radial decoupling, the power exchange region is limited by the mode radial width. In the former regime, the mode saturation amplitude scales quadratically with the growth rate; in the latter, it scales linearly. The occurrence of one or the other regime can be predicted on the basis of linear dynamics: in particular, the radial profile of the fast-ion resonance frequency and the mode structure. Here, we discuss how such properties can depend on the considered toroidal number and compare simulation results with the predictions obtained from a simplified nonlinear pendulum model. © EUROfusion.

Published
2016

30. D 3.1 Progress report on membrane and catalyst development and preparation of first batches of large area membranes and catalyst components for MEA development (HPEM2GAS R.E. 09/17)

Author

A. S. Aricò, S. Siracusano, V. Baglio, N. Briguglio, S. Trocino, G. Monforte (CNR), L. Merlo, S. Tonella, C. Oldani (Solvay), N. Van Dijk (ITM), and L. Grahl-Madsen (IRD-EWII)

Subjects
inorganic chemicals, organic chemicals, High Performance PEM Electrolyser, food and beverages, heterocyclic compounds, Cost-effective Grid Balancing Applications
Abstract

Progress report on membrane and catalyst development and preparation of first batches of large area membranes and catalyst components for MEA development

Published
2017

35. Overview of the FTU results

Author

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

Published
2017
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43. Effects of complex symmetry-breakings on alpha particle power loads on first wall structures and equilibrium in ITER

Author

Shinohara, K., Kurki-Suonio, T., Spong, D., Asunta, O., Tani, K., Strumberger, E., Briguglio, S., Koskela, T., Vlad, G., Günter, S., Kramer, G., Putvinski, S., Hamamatsu, K., ITPA Topical Group on Energetic Particles, and ITPA Topical Group on Energetic Particles

Subjects
Physics, Nuclear and High Energy Physics, Tokamak, Anomalous diffusion, Ripple, Rotational symmetry, Alpha particle, Plasma, Mechanics, Condensed Matter Physics, 01 natural sciences, 010305 fluids & plasmas, law.invention, Nuclear physics, law, 0103 physical sciences, Symmetry breaking, Magnetohydrodynamics, 010306 general physics
Abstract

Within the ITPA Topical Group on Energetic Particles, we have investigated the impact that various mechanisms breaking the tokamak axisymmetry can have on the fusion alpha particle confinement in ITER as well as on the wall power loads due to these alphas. In addition to the well-known TF ripple, the 3D effect due to ferromagnetic materials (in ferritic inserts and test blanket modules) and ELM mitigation coils are included in these mechanisms. ITER scenario 4 was chosen since, due to its lower plasma current, it is more vulnerable for various off-normal features. First, the validity of using a 2D equilibrium was investigated: a 3D equilibrium was reconstructed using the VMEC code, and it was verified that no 3D equilibrium reconstruction is needed but it is sufficient to add the vacuum field perturbations onto an axisymmetric equilibrium. Then the alpha particle confinement was studied using three independent codes, ASCOT, DELTA5D and F3D OFMC, all of which assume MHD quiescent background plasma and no anomalous diffusion. All the codes gave a loss power fraction of about 0.2%. The distribution of the peak power load was found to depend on the first wall shape. We also made the first attempt to accommodate the effect of fast-ion-related MHD on the wall loads in ITER using the HMGC and ASCOT codes. The power flux to the wall was found to increase due to the redistribution of fast ions by the MHD activity. Furthermore, the effect of the ELM mitigation field on the fast-ion confinement was addressed by simulating NBI ions with the F3D OFMC code. The loss power fraction of NBI ions was found to increase from 0.3% without the ELM mitigation field to 4‐5% with the ELM mitigation field. (Some figures in this article are in colour only in the electronic version)

Published
2011

45. Overview of the FTU results

Author

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

Published
2015
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48. Scenario Development for FAST in the View of ITER and DEMO

Author

Crisanti F., Albanese R., Artaud F., Baiocchi B., Baruzzo M., Basiuk V., Bierwage A., Bilato R., Bolzonella T., Brambilla M., Briguglio S., Calabrò G., Cardinali A., Corrigan G., Cucchiaro A., Di Troia C., Farina D., Figini L., Fogaccia G., Giruzzi G., Granucci G., Imbeaux F., Johnson T., Lauro Taroni L., Maggiora R., Mantica P., Milanesio D., Parail V., Pericoli-Ridolfini V., Pizzuto A., Podda S., Ramogida G., Santinelli M., Schneider M., Tuccillo A., Valisa M., Villari R., Viola B., Vlad G., Wang X., and Zonca F.

Subjects
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Abstract

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Published
2010

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