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503 results on '"Escande, D."'

1. Modelling of impurity heating during reconnections in a Reverse Field Pinch device as due to parallel electric field acceleration and chaos-induced thermalization

Author

Sattin, F., Escande, D. F., Gobbin, M., and Predebon, I.

Subjects
Physics - Plasma Physics
Abstract

The ion temperature during magnetic reconnections measured along the direction of the magnetic field at the MST Reverse Field Pinch has not yet received a satisfactory theoretical explanation. In this work we argue that it is consistent with a picture of ion energization by the parallel electric fields generated by the plasma during reconnection, and thermalization due to the chaotic ion dynamics. Three possible sources of randomness are pointed out: particle motion along static stochastic magnetic field lines, breakup of the adiabatic ion dynamics caused by the strong gradient nonlinearity of the magnetic field, parallel acceleration along stochastic time-dependent electric fields. The three mechanisms are likely operative simultaneously; regardless the specific mechanism active, the correct scaling laws with ion parameters are recovered. Furthermore, we argue that quantitative agreement can be obtained by feeding the model with realistic values for the plasma conditions.

Published
2023

2. Thresholdless stochastic particle heating by a single wave

Author

Sattin, F. and Escande, D. F.

Subjects
Physics - Plasma Physics
Abstract

Stochastic heating is a well-known mechanism through which magnetized particles may be energized by low-frequency electromagnetic waves. In its simplest version, under spatially homogeneous conditions, it is known to be operative only above a threshold in the normalized wave amplitude, which may be a demanding requisite in actual scenarios, severely restricting its range of applicability. In this work we show, by numerical simulations supported by inspection of the particle Hamiltonian, that allowing for even a very weak spatial inhomogeneity completely removes the threshold, trading the requirement upon the wave amplitude with a requisite upon the duration of the interaction between wave and particle. The thresholdless chaotic mechanism considered here is likely to be applicable to other inhomogeneous systems., Comment: V2. Some minor mistakes corrected

Published
2022
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3. A unified model of density limit in fusion plasmas

Author

Zanca, P., Sattin, F., Escande, D. F., Pucella, G., and Tudisco, O.

Subjects
Physics - Plasma Physics
Abstract

A limit for the edge density, ruled by radiation losses from light impurities, is established by a minimal cylindrical magneto-thermal equilibrium model. For ohmic tokamak and reversed field pinch the limit scales linearly with the plasma current, as the empirical Greenwald limit. The auxiliary heating adds a further dependence, scaling with the 0.4 power, in agreement with L-mode tokamak experiments. For a purely externally heated configuration the limit takes on a Sudo-like form, depending mainly on the input power, and is compatible with recent Stellarator scalings.

Published
2016
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4. Effect of magnetic perturbations on the 3D MHD self-organization of shaped tokamak plasmas

Author

Bonfiglio, D., Cappello, S., Veranda, M., Chacón, L., and Escande, D. F.

Subjects
Physics - Plasma Physics
Abstract

The effect of magnetic perturbations (MPs) on the helical self-organization of shaped tokamak plasmas is discussed in the framework of the nonlinear 3D MHD model. Numerical simulations performed in toroidal geometry with the \textsc{pixie3d} code [L. Chac\'on, Phys. Plasmas {\bf 15}, 056103 (2008)] show that $n=1$ MPs significantly affect the spontaneous quasi-periodic sawtoothing activity of such plasmas. In particular, the mitigation of sawtooth oscillations is induced by $m/n=1/1$ and $2/1$ MPs. These numerical findings provide a confirmation of previous circular tokamak simulations, and are in agreement with tokamak experiments in the RFX-mod and DIII-D devices. Sawtooth mitigation via MPs has also been observed in reversed-field pinch simulations and experiments. The effect of MPs on the stochastization of the edge magnetic field is also discussed., Comment: Proceeding paper of the 7th IAEA Technical Meeting on 'Theory of Plasmas Instabilities', Frascati (Italy), March 4-6, 2015. This manuscript will be published on the conference website http://www.iaeatm-inst2015.enea.it/

Published
2016

5. Impact Of A Uniform Plasma Resistivity In MHD Modelling Of Helical Solutions For The Reversed Field Pinch Dynamo

Author

Bonfiglio, D., Cappello, S., and Escande, D. F.

Subjects
Physics - Plasma Physics
Abstract

Till now the magnetohydrodynamic (MHD) simulation of the reversed field pinch (RFP) has been performed by assuming axis-symmetric radial time independent dissipation profiles. In helical states this assumption is not correct since these dissipations should be flux functions, and should exhibit a helical symmetry as well. Therefore more correct simulations should incorporate self-consistent dissipation profiles. As a first step in this direction, the case of uniform dissipation profiles was considered by using the 3D nonlinear visco-resistive MHD code SpeCyl. It is found that a flattening of the resistivity profile results in the reduction of the dynamo action, which brings to marginally-reversed or even non-reversed equilibrium solutions. The physical origin of this result is discussed in relation to the electrostatic drift explanation of the RFP dynamo. This sets constraints on the functional choice of dissipations in future self-consistent simulations., Comment: Proceeding paper of the 13th International Congress on Plasma Physics, Kiev, May 22-26, 2006. This manuscript has been submitted to arXiv because it is no longer present in the conference website http://www.icpp2006.kiev.ua/

Published
2016

6. N-body description of Debye shielding and Landau damping

Author

Escande, D. F., Doveil, F., and Elskens, Yves

Subjects
Physics - Plasma Physics, Physics - Classical Physics
Abstract

This paper brings further insight into the recently published N-body description of Debye shielding and Landau damping [Escande D F, Elskens Y and Doveil F 2014 Plasma Phys. Control. Fusion 57 025017]. Its fundamental equation for the electrostatic potential is derived in a simpler and more rigorous way. Various physical consequences of the new approach are discussed, and this approach is compared with the seminal one by Pines and Bohm [Pines D and Bohm D 1952 Phys. Rev. 85 338--353]., Comment: invited talk to 42nd EPS conference on plasma physics (Lisbon, 2015), submitted to Plasma Physics and Controlled Fusion

Published
2015
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7. Vlasov equation and $N$-body dynamics - How central is particle dynamics to our understanding of plasmas?

Author

Elskens, Yves, Escande, D. F., and Doveil, Fabrice

Subjects
Physics - Plasma Physics, Mathematical Physics
Abstract

Difficulties in founding microscopically the Vlasov equation for Coulomb-interacting particles are recalled for both the statistical approach (BBGKY hierarchy and Liouville equation on phase space) and the dynamical approach (single empirical measure on one-particle $(\mathbf{r},\mathbf{v})$-space). The role of particle trajectories (characteristics) in the analysis of the partial differential Vlasov--Poisson system is stressed. Starting from many-body dynamics, a direct derivation of both Debye shielding and collective behaviour is sketched., Comment: revTeX, 15 pp

Published
2014
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8. Perturbative transport experiments: to what extent do they really probe microscopic transport?

Author

Sattin, F., Escande, D. F., Auriemma, F., Urso, G., and Terranova, D.

Subjects
Physics - Plasma Physics
Abstract

Experiments featuring fast heat propagation, or so called "non-local" transport, were a puzzle for almost two decades. However recently it was shown, and it is recalled here, that a collective ideal MHD response of the plasma provides a quantitative agreement with these experiments, whereas transport plays just a secondary role. Then this work reviews the algebraic approach to transport data inversion that provides a formally exact solution, as well as a quantitative assessment of error bars, limited to periodic signals. Conversely, standard transport reconstructions are shown to sometimes fail to match the exact solution. The adoption of automated global search algorithms based upon Genetic Algorithms is bound to greatly increase the probability of finding optimal solutions. Finally, the standard methods of reconstruction infer the diffusivity D and pinch V by matching experimental data against those simulated by transport codes. These methods do not warrant the validity neither of the underlying models of transport, nor of the reconstructed D(r) and V(r), even when the results look reasonable., Comment: To be submitted to Plasma Physics and Controlled Fusion, cluster issue on "Physics-based Optimization of Plasma Diagnostic Information"

Published
2014

9. Alfvenic propagation: a key to nonlocal effects in magnetized plasmas

Author

Sattin, F. and Escande, D. F.

Subjects
Physics - Plasma Physics
Abstract

A long standing puzzle in fusion research comes from experiments where a sudden peripheral electron temperature perturbation is accompanied by an almost simultaneous opposite change in central temperature, in a way incompatible with local transport models. This paper shows these experiments and similar ones are fairly well quantitatively reproduced, when induction effects are incorporated in the total plasma response, alongside standard local diffusive transport, as suggested in earlier work [V.D. Pustovitov, Plasma Phys. Control. Fusion {\bf 54}, 124036 (2012)]., Comment: After the publication of the paper we became aware of a fundamental error in the normalization of our equations. While at some places, plasma pressure was normalized to the magnetic energy density, at other places, plasma pressure and the plasma pressure source were normalized to the {\it equilibrium} plasma pressure. This involves that a $\beta$ factor was missing in some of the equations. By an unfortunate coincidence the different sources of error largely masked each other in the final results, thereby allowing the model to provide seemingly accurate conclusions. The correction of this error implies that the alleged MHD effects are smaller by a factor $\beta$, and cannot account for the phenomenology observed. This invalidates our conclusions

Published
2013
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11. Estimate of convection-diffusion coefficients from modulated perturbative experiments as an inverse problem

Author

Sattin, F., Escande, D. F., Camenen, Y., Salmi, A. T., and Tala, T.

Subjects
Physics - Plasma Physics
Abstract

The estimate of coefficients of the Convection-Diffusion Equation (CDE) from experimental measurements belongs in the category of inverse problems, which are known to come with issues of ill-conditioning or singularity. Here we concentrate on a particular class that can be reduced to a linear algebraic problem, with explicit solution. Ill-conditioning of the problem corresponds to the vanishing of one eigenvalue of the matrix to be inverted. The comparison with algorithms based upon matching experimental data against numerical integration of the CDE sheds light on the accuracy of the parameter estimation procedures, and suggests a path for a more precise assessment of the profiles and of the related uncertainty. Several instances of the implementation of the algorithm to real data are presented., Comment: Extended version of an invited talk presented at the 2012 EPS Conference. To appear in Plasma Physics and Controlled Fusion

Published
2012
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12. Calculation of transport coefficient profiles in modulation experiments as an inverse problem

Author

Escande, D. F. and Sattin, F.

Subjects
Physics - Plasma Physics
Abstract

The calculation of transport profiles from experimental measurements belongs in the category of inverse problems which are known to come with issues of ill-conditioning or singularity. A reformulation of the calculation, the matricial approach, is proposed for periodically modulated experiments, within the context of the standard advection-diffusion model where these issues are related to the vanishing of the determinant of a 2x2 matrix. This sheds light on the accuracy of calculations with transport codes, and provides a path for a more precise assessment of the profiles and of the related uncertainty., Comment: V2: two typos corrected

Published
2011
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14. When can Fokker-Planck Equation describe anomalous or chaotic transport?

Author

Escande, D. F. and Sattin, F.

Subjects
Physics - Plasma Physics
Abstract

The Fokker-Planck Equation, applied to transport processes in fusion plasmas, can model several anomalous features, including uphill transport, scaling of confinement time with system size, and convective propagation of externally induced perturbations. It can be justified for generic particle transport provided that there is enough randomness in the Hamiltonian describing the dynamics. Then, except for 1 degree-of-freedom, the two transport coefficients are largely independent. Depending on the statistics of interest, the same dynamical system may be found diffusive or dominated by its L\'{e}vy flights., Comment: 4 pages. Accepted in Physical Review Letters. V2: only some minor changes

Published
2007
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15. Rigorous approach to the nonlinear saturation of the tearing mode in cylindrical and slab geometry

Author

Arcis, N., Escande, D. F., and Ottaviani, M.

Subjects
Physics - Plasma Physics
Abstract

The saturation of the tearing mode instability is described within the standard framework of reduced magnetohydrodynamics (RMHD) in the case of an $r$-dependent or of a uniform resistivity profile. Using the technique of matched asymptotic expansions, where the perturbation parameter is the island width $w$, the problem can be solved in two ways: with the so-called flux coordinate method, which is based on the fact that the current profile is a flux function, and with a new perturbative method that does not use this property. The latter is applicable to more general situations where an external forcing or a sheared velocity profile are involved. The calculation provides a new relationship between the saturated island width and the $\Delta '$ stability parameter that involves a $\ln{w/w_{0}}$ term, where $w_{0}$ is a nonlinear scaling length that was missing in previous work. It also yields the modification of the equilibrium magnetic flux function.

Published
2006
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16. Perturbative approach to the nonlinear saturation of the tearing mode for any current gradient

Author

Arcis, N., Escande, D. F., and Ottaviani, M.

Subjects
Physics - Plasma Physics
Abstract

Within the traditional frame of reduced MHD, a new rigorous perturbation expansion provides the equation ruling the nonlinear growth and saturation of the tearing mode for any current gradient. The small parameter is the magnetic island width w. For the first time, the final equation displays at once terms of order w ln(1/w) and w which have the same magnitude for practical purposes; two new O(w) terms involve the current gradient. The technique is applicable to the case of an external forcing. The solution for a static forcing is computed explicitly and it exhibits three physical regimes., Comment: 4 pages, submitted to Physical Review Letters

Published
2005

18. Quasilinear diffusion for the chaotic motion of a particle in a set of longitudinal waves

Author

Escande, D. F. and Elskens, Y.

Subjects
Physics - Plasma Physics, Condensed Matter - Statistical Mechanics, Nonlinear Sciences - Chaotic Dynamics
Abstract

The rigorous analytical calculation of the diffusion coefficient is performed for the chaotic motion of a particle in a set of longitudinal waves with random phases and large amplitudes (~ A). A first step proves the existence of a quasilinear diffusion on a time scale ~ A^{-2/3} \ln A. A second step uses this property to extend the result to asymptotic times by introducing the conditional probability distribution of position and velocity of an orbit at a given time when they are known at a previous time., Comment: 5 pages LaTeX - 14th Marian Smoluchowski Symposium on Statistical Physics: Fundamentals and Applications, Zakopane, Poland, September 9-14, 2001 ; typos removed

Published
2001

23. Large scale structures in kinetic plasma turbulence

Author

Escande, D. F., Araki, H., editor, Ehlers, J., editor, Hepp, K., editor, Jaffe, R. L., editor, Kippenhahn, R., editor, Ruelle, D., editor, Weidenmüller, H. A., editor, Wess, J., editor, Zittartz, J., editor, Beiglböck, W., editor, Fournier, Jean-Daniel, editor, and Sulem, Pierre-Louis, editor

Published
1991
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24. Modeling of Basic Physics Issues in Toroidal Pinches and Tools for Performance Control

Author

Cappello S., Bonfiglio D., Di Giannatale G., Escande D., Kryzhanovskyy A., Manduchi G., Rigoni A., Sattin F., Spinicci L., Spizzo G., Veranda M., Vivenzi N., Chacon L., Grasso D., Falessi M.V., and Pegoraro F.

Subjects
Basic Physics Issues, Physics::Plasma Physics, Tokamak, Performance Control, Reversed Field Pink, Toroidal Pinches
Abstract

Recent progress about helical self-organization studies is reported. Extensive exploita5on of 3D nonlinear visco-resistive modeling, SpeCyl code, which describes current-driven dynamics typical of pinch configura5ons in cylindrical geometry. Magnetic topology studies are based on the Field Line Tracing code NEMATO and a new refined tool to detect Lagrangian Coherent Structures is compared with results from a temperature equa/on solver. The following Physics Issues in helical self-organization are addressed: o Boundary Conditions and dimensionless parameters impact, (RFP, and circular Tokamak) o Forma5on of internal transport barriers, (RFP) o Temporary loss of opera5onal point, reconnec5on events, (RFP and circular Tokamak), o Alfvén waves excitation (RFP and circular Tokamak), RESULTS show: o Reasonable comparison (validation) with RFP experimental observations, o Similarities between RFP and Tokamak-like configuration.

Published
2021

25. The reversed field pinch

Author

Marrelli, Lionello, Martin, P., Puiatti, M. E., Sarff, J. S., Chapman, Brett, Drake, James Robert, Escande, D. F., Masamune, S., Marrelli, Lionello, Martin, P., Puiatti, M. E., Sarff, J. S., Chapman, Brett, Drake, James Robert, Escande, D. F., and Masamune, S.

Abstract

This paper reviews the research on the reversed field pinch (RFP) in the last three decades. Substantial experimental and theoretical progress and transformational changes have been achieved since the last review (Bodin 1990 Nucl. Fusion 30 1717-37). The experiments have been performed in devices with different sizes and capabilities. The largest are RFX-mod in Padova (Italy) and MST in Madison (USA). The experimental community includes also EXTRAP-T2R in Sweden, RELAX in Japan and KTX in China. Impressive improvements in the performance are the result of exploration of two lines: the high current operation (up to 2 MA) with the spontaneous occurrence of helical equilibria with good magnetic flux surfaces and the active control of the current profile. A crucial ingredient for the advancements obtained in the experiments has been the development of state-of-art active feedback control systems allowing the control of MHD instabilities in presence of a thin shell. The balance between achievements and still open issues leads us to the conclusion that the RFP can be a valuable and diverse contributor in the quest for fusion electricity., QC 20210409

Published
2021
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28. Overview of the RFX-mod fusion science activity

Author

Zuin, M, DAL BELLO, S, Marrelli, L, Puiatti, M, Agostinetti, P, Agostini, M, Antoni, V, Auriemma, F, Barbisan, M, Barbui, T, Baruzzo, M, Belli, F, Bettini, P, Bigi, M, Bilel, R, Boldrin, M, Bolzonella, T, Bonfiglio, D, Brombin, M, Buffa, A, Bustreo, C, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Cester, D, Chacon, L, Chitarin, G, Cooper, W, Cordaro, L, DALLA PALMA, M, Deambrosis, S, Delogu, R, De Lorenzi, A, DE MASI, G, Dong, J, Escande, D, Fassina, A, Felici, F, Ferro, A, Finotti, C, Franz, P, Frassinetti, L, Gaio, E, Ghezzi, F, Giudicotti, L, Gnesotto, F, Gobbin, M, Gonzalez, W, Grando, L, Guo, S, Hanson, J, Hirshman, S, Innocente, P, Jackson, J, Kiyama, S, Komm, M, Kudlacek, O, Laguardia, A, Li, C, Liu, B, Liu, S, Liu, Y, López Bruna, D, Lorenzini, R, Luce, T, Luchetta, A, Maistrello, A, Manduchi, G, Mansfield, D, Marchiori, G, Marconato, N, Marcuzzi, D, Martin, P, Martines, E, Martini, S, Mazzitelli, G, Mccormack, O, Miorin, E, Momo, B, Moresco, M, Narushima, Y, Okabayashi, M, Paccagnella, R, Patel, N, Pavei, M, Peruzzo, S, Pilan, N, Pigatto, L, Piovan, R, Piovesan, P, Piron, C, Piron, L, Predebon, I, Pucella, G, Rea, C, Recchia, M, Rizzolo, A, Rostagni, G, Ruset, C, Sajò Bohus, L, Sakakita, H, Sanchez, R, Sarff, J, Sattin, F, Scarin, P, Schmitz, O, Schneider, W, Siragusa, M, Sonato, P, Spada, E, Spagnolo, S, Spolaore, M, Spong, D, Spizzo, G, Stevanato, L, Suzuki, Y, Taliercio, C, Terranova, D, Tudisco, O, Urso, G, Valente, M, Valisa, M, Vallar, M, Veranda, M, Vianello, N, Villone, F, Vincenzi, P, Visonà, N, White, R, Xanthopoulos, P, Xu, X, Yanovskiy, V, Zamengo, A, Zanca, P, Zaniol, B, Zanotto, L, Zhang, Y, Zilli, E, ZUIN, MATTEO, DAL BELLO, SILVIA, MARRELLI, LIONELLO, Puiatti, M. E., AGOSTINETTI, PIERO, AGOSTINI, MATTEO, ANTONI, VANNI, AURIEMMA, FULVIO, BARBISAN, MARCO, BARBUI, TULLIO, BARUZZO, MATTEO, Belli, F., BETTINI, PAOLO, Bigi, M., Bilel, R., Boldrin, M., BOLZONELLA, TOMMASO, BONFIGLIO, DANIELE, BROMBIN, MATTEO, BUFFA, ANTONIO, BUSTREO, CHIARA, CANTON, ALESSANDRA MARIA, CAPPELLO, SUSANNA, Carraro, L., Cavazzana, R., CESTER, DAVIDE, Chacon, L., CHITARIN, GIUSEPPE, Cooper, W. A., CORDARO, LUIGI, DALLA PALMA, MAURO, DEAMBROSIS, SILVIA MARIA, Delogu, R., De Lorenzi, A., DE MASI, GIANLUCA, Dong, J. Q., Escande, D. F., FASSINA, ALESSANDRO, Felici, F., Ferro, A., FINOTTI, CLAUDIO, Franz, P., FRASSINETTI, LORENZO, Gaio, E., GHEZZI, FEDERICO, GIUDICOTTI, LEONARDO, GNESOTTO, FRANCESCO, GOBBIN, MARCO, GONZALEZ, WINDER ALEXANDER, GRANDO, LUCA, Guo, S. C., Hanson, J. D., Hirshman, S. P., Innocente, P., Jackson, J. L., Kiyama, S., Komm, M., KUDLACEK, ONDREJ, LAGUARDIA, ANNA LUCIA, Li, C., Liu, B., Liu, S. F., Liu, Y. Q., López Bruna, D., Lorenzini, R., Luce, T. C., LUCHETTA, ADRIANO FRANCESCO, MAISTRELLO, ALBERTO, MANDUCHI, GABRIELE, Mansfield, D. K., Marchiori, G., MARCONATO, NICOLO', Marcuzzi, D., MARTIN, PIERO, MARTINES, EMILIO, MARTINI, STEFANO, Mazzitelli, G., Mccormack, O., Miorin, E., MOMO, BARBARA, MORESCO, MAURIZIO, Narushima, Y., Okabayashi, M., Paccagnella, R., Patel, N., Pavei, M., Peruzzo, S., Pilan, N., Pigatto, L., Piovan, R., Piovesan, P., Piron, C., Piron, L., Predebon, I., Pucella, G., Rea, C., Recchia, M., Rizzolo, A., Rostagni, G., Ruset, C., Sajò Bohus, L., Sakakita, H., Sanchez, R., Sarff, J. S., Sattin, F., Scarin, P., Schmitz, O., Schneider, W., Siragusa, M., Sonato, P., Spada, E., Spagnolo, S., Spolaore, M., Spong, D. A., Spizzo, G., Stevanato, L., Suzuki, Y., Taliercio, C., Terranova, D., Tudisco, O., Urso, G., Valente, M., Valisa, M., Vallar, M., Veranda, M., Vianello, N., Villone, F., Vincenzi, P., Visonà, N., White, R. B., Xanthopoulos, P., Xu, X. Y., Yanovskiy, V., Zamengo, A., Zanca, P., Zaniol, B., Zanotto, L., Zhang, Y., Zilli, E., Zuin, M, DAL BELLO, S, Marrelli, L, Puiatti, M, Agostinetti, P, Agostini, M, Antoni, V, Auriemma, F, Barbisan, M, Barbui, T, Baruzzo, M, Belli, F, Bettini, P, Bigi, M, Bilel, R, Boldrin, M, Bolzonella, T, Bonfiglio, D, Brombin, M, Buffa, A, Bustreo, C, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Cester, D, Chacon, L, Chitarin, G, Cooper, W, Cordaro, L, DALLA PALMA, M, Deambrosis, S, Delogu, R, De Lorenzi, A, DE MASI, G, Dong, J, Escande, D, Fassina, A, Felici, F, Ferro, A, Finotti, C, Franz, P, Frassinetti, L, Gaio, E, Ghezzi, F, Giudicotti, L, Gnesotto, F, Gobbin, M, Gonzalez, W, Grando, L, Guo, S, Hanson, J, Hirshman, S, Innocente, P, Jackson, J, Kiyama, S, Komm, M, Kudlacek, O, Laguardia, A, Li, C, Liu, B, Liu, S, Liu, Y, López Bruna, D, Lorenzini, R, Luce, T, Luchetta, A, Maistrello, A, Manduchi, G, Mansfield, D, Marchiori, G, Marconato, N, Marcuzzi, D, Martin, P, Martines, E, Martini, S, Mazzitelli, G, Mccormack, O, Miorin, E, Momo, B, Moresco, M, Narushima, Y, Okabayashi, M, Paccagnella, R, Patel, N, Pavei, M, Peruzzo, S, Pilan, N, Pigatto, L, Piovan, R, Piovesan, P, Piron, C, Piron, L, Predebon, I, Pucella, G, Rea, C, Recchia, M, Rizzolo, A, Rostagni, G, Ruset, C, Sajò Bohus, L, Sakakita, H, Sanchez, R, Sarff, J, Sattin, F, Scarin, P, Schmitz, O, Schneider, W, Siragusa, M, Sonato, P, Spada, E, Spagnolo, S, Spolaore, M, Spong, D, Spizzo, G, Stevanato, L, Suzuki, Y, Taliercio, C, Terranova, D, Tudisco, O, Urso, G, Valente, M, Valisa, M, Vallar, M, Veranda, M, Vianello, N, Villone, F, Vincenzi, P, Visonà, N, White, R, Xanthopoulos, P, Xu, X, Yanovskiy, V, Zamengo, A, Zanca, P, Zaniol, B, Zanotto, L, Zhang, Y, Zilli, E, ZUIN, MATTEO, DAL BELLO, SILVIA, MARRELLI, LIONELLO, Puiatti, M. E., AGOSTINETTI, PIERO, AGOSTINI, MATTEO, ANTONI, VANNI, AURIEMMA, FULVIO, BARBISAN, MARCO, BARBUI, TULLIO, BARUZZO, MATTEO, Belli, F., BETTINI, PAOLO, Bigi, M., Bilel, R., Boldrin, M., BOLZONELLA, TOMMASO, BONFIGLIO, DANIELE, BROMBIN, MATTEO, BUFFA, ANTONIO, BUSTREO, CHIARA, CANTON, ALESSANDRA MARIA, CAPPELLO, SUSANNA, Carraro, L., Cavazzana, R., CESTER, DAVIDE, Chacon, L., CHITARIN, GIUSEPPE, Cooper, W. A., CORDARO, LUIGI, DALLA PALMA, MAURO, DEAMBROSIS, SILVIA MARIA, Delogu, R., De Lorenzi, A., DE MASI, GIANLUCA, Dong, J. Q., Escande, D. F., FASSINA, ALESSANDRO, Felici, F., Ferro, A., FINOTTI, CLAUDIO, Franz, P., FRASSINETTI, LORENZO, Gaio, E., GHEZZI, FEDERICO, GIUDICOTTI, LEONARDO, GNESOTTO, FRANCESCO, GOBBIN, MARCO, GONZALEZ, WINDER ALEXANDER, GRANDO, LUCA, Guo, S. C., Hanson, J. D., Hirshman, S. P., Innocente, P., Jackson, J. L., Kiyama, S., Komm, M., KUDLACEK, ONDREJ, LAGUARDIA, ANNA LUCIA, Li, C., Liu, B., Liu, S. F., Liu, Y. Q., López Bruna, D., Lorenzini, R., Luce, T. C., LUCHETTA, ADRIANO FRANCESCO, MAISTRELLO, ALBERTO, MANDUCHI, GABRIELE, Mansfield, D. K., Marchiori, G., MARCONATO, NICOLO', Marcuzzi, D., MARTIN, PIERO, MARTINES, EMILIO, MARTINI, STEFANO, Mazzitelli, G., Mccormack, O., Miorin, E., MOMO, BARBARA, MORESCO, MAURIZIO, Narushima, Y., Okabayashi, M., Paccagnella, R., Patel, N., Pavei, M., Peruzzo, S., Pilan, N., Pigatto, L., Piovan, R., Piovesan, P., Piron, C., Piron, L., Predebon, I., Pucella, G., Rea, C., Recchia, M., Rizzolo, A., Rostagni, G., Ruset, C., Sajò Bohus, L., Sakakita, H., Sanchez, R., Sarff, J. S., Sattin, F., Scarin, P., Schmitz, O., Schneider, W., Siragusa, M., Sonato, P., Spada, E., Spagnolo, S., Spolaore, M., Spong, D. A., Spizzo, G., Stevanato, L., Suzuki, Y., Taliercio, C., Terranova, D., Tudisco, O., Urso, G., Valente, M., Valisa, M., Vallar, M., Veranda, M., Vianello, N., Villone, F., Vincenzi, P., Visonà, N., White, R. B., Xanthopoulos, P., Xu, X. Y., Yanovskiy, V., Zamengo, A., Zanca, P., Zaniol, B., Zanotto, L., Zhang, Y., and Zilli, E.

Abstract

This paper reports the main recent results of the RFX-mod fusion science activity. The RFX-mod device is characterized by a unique exibility in terms of accessible magnetic con gurations. Axisymmetric and helically shaped reversed- eld pinch equilibria have been studied, along with tokamak plasmas in a wide range of q(a) regimes (spanning from 4 down to 1.2 values). The full range of magnetic con gurations in between the two, the so-called ultra-low q ones, has been explored, with the aim of studying speci c physical issues common to all equilibria, such as, for example, the density limit phenomenon. The powerful RFX-mod feedback control system has been exploited for MHD control, which allowed us to extend the range of experimental parameters, as well as to induce speci c magnetic perturbations for the study of 3D effects. In particular, transport, edge and isotope effects in 3D equilibria have been investigated, along with runaway mitigations through induced magnetic perturbations. The rst transitions to an improved con nement scenario in circular and D-shaped tokamak plasmas have been obtained thanks to an active modi cation of the edge electric eld through a polarized electrode. The experiments are supported by intense modeling with 3D MHD, gyrokinetic, guiding center and transport codes. Proposed modi cations to the RFX-mod device, which will enable further contributions to the solution of key issues in the roadmap to ITER and DEMO, are also brie y presented.

Published
2017

29. Status and Perspective of a Reversed Field Pinch as Fusion Core in a Fusion-Fission Hybrid Reactor

Author

Piovan R., Agostinetti P., Bustreo C., Cavazzana R., Escande D., Gaio E., Lunardon F., Maistrello A., Puiatti M.E., Valisa M., Zollino G., and Zuin M.

Subjects
Experimental devices, Power and Control, Next step devices and power plants
Abstract

Fusion-fission hybrid reactors (FFHR), which consist of a neutron-producing fusion core surrounded by a fission blanket, keep a sustained interest because of their potential to address energy production before the availability of pure fusion reactors and also because of their capability of fuel supply and waste management. The U.S. Department of Energy (DOE) sponsored a workshop in 2009 in order to assess the potentiality of fusion-fission reactors and, among the others alternative to the Tokamak as fusion core, the Reversed Field Pinch (RFP) was considered, even if not on the same timeline of the Tokamak. On the other hand, the interest in the RFP as fusion core resides, inter alia, in its possibility to reach ignition in a pure ohmic way with a "light" toroidal field winding, which simplifies significantly the hybrid reactor layout and operation and strongly decreases costs with respect to other fusion core solutions. New studies are now in progress in order to revisit the status and the potentiality of the RFP as fusion core in FFHR, taking into account (i) the recent progress in RFP physics brought by the results of the RFX-mod experiment (R=2, a=0.46, Ip=2MA), mainly about MHD modes control, (ii) the expected performance improvements resulting from the ongoing upgrade of the machine. Starting from RFX-mod results and scaling laws, and considering the estimated improvements of the performances derived from the machine enhancements underway, the possibility to realize a preliminary pilot experiment in which a RFP is the neutron fusion source is analysed. The research needs for this advanced solution are updated with respect to the 2009 workshop.

Published
2019

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

Author

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

Subjects
Physics, quasi-single-helicity, Toroid, Tokamak, Fusion plasma, General Physics and Astronomy, Magnetic confinement fusion, reversed field pinch, Mechanics, Plasma, Fusion power, Instability, law.invention, Physics::Plasma Physics, law, RFP, Pinch, QSH, Atomic physics
Abstract

In the quest for new energy sources, the research on controlled thermonuclear fusion has been boosted by the start of the construction phase of the International Thermonuclear Experimental Reactor (ITER). ITER is based on the tokamak magnetic configuration, which is the best performing one in terms of energy confinement. Alternative concepts are however actively researched, which in the long term could be considered for a second generation of reactors. Here, we show results concerning one of these configurations, the reversed-field pinch (RFP). By increasing the plasma current, a spontaneous transition to a helical equilibrium occurs, with a change of magnetic topology. Partially conserved magnetic flux surfaces emerge within residual magnetic chaos, resulting in the onset of a transport barrier. This is a structural change and sheds new light on the potential of the RFP as the basis for a low-magnetic-field ohmic fusion reactor. © 2009 Macmillan Publishers Limited.

Published
2009

31. Role of MHD Dynamo in the Formation of 3D Equilibria in Fusion Plasmas

Author

Piovesan, P., Bonfiglio, D., Cappello, S., Chacon, L., Chrystal, C., Escande, D., Franz, P., Holcomb, C., Igochine, V., Luce, T., Marrelli, L., Nornberg, M., Paz-Soldan, C., Piron, L., Sarff, J., Taylor, N., Terranova, D., Turco, F., Zanca, P., and Zaniol, B.

Published
2018

32. A fusion-fission hybrid reactor model for research and applications

Author

Panza F., Bettini P., Bustreo C., Casagrande R., Cavazzana R., Escande D., Piovan R., Puiatti M.E., Ricco G., Ripani M., Valisa M., Zollino G., and Zuin M.

Subjects
FFHR, RFP, Fusion-Fission Hybrid Reactor, Reversed Field Pinch
Abstract

A hybrid fusion-fission reactor based on a Reversed Field Pinch configuration has been studied. The fusion core generating 140MWth fusion power via D-T reactions produces 4.97E+19 n/s. The areas around the torus are composed of tritium breeding regions and of a modular subcritical fission blanket (keff~0.97, P~1.24 GWth), sustained by fusion neutrons, spaced out by two intermediate regions that can be used for studying fast and slow transmutations and radio-pharmaceuticals production. The results corroborate the interest for this model due to the simple design of the fusion reactor, the high accessibility to the blankets for maintenance and the multiple applications.

Published
2018

33. Overview of the RFX-mod contribution to the international Fusion Science Program

Author

Puiatti, M, Dal Bello, S, Marrelli, L, Martin, P, Agostinetti, P, Agostini, M, Antoni, V, Auriemma, F, Barbisan, M, Barbui, T, Baruzzo, M, Battistella, M, Belli, F, Bettini, P, Bigi, M, Bilel, R, Boldrin, M, Bolzonella, T, Bonfiglio, D, Brombin, M, Buffa, A, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Cester, D, Chacon, L, Chapman, B, Chitarin, G, Ciaccio, G, Cooper, W, Dalla Palma, M, Deambrosis, S, Delogu, R, De Lorenzi, A, De Masi, G, Dong, J, Escande, D, Esposito, B, Fassina, A, Fellin, F, Ferro, A, Finotti, C, Franz, P, Frassinetti, L, Palumbo, M, Gaio, E, Ghezzi, F, Giudicotti, L, Gnesotto, F, Gobbin, M, Gonzales, W, Grando, L, Guo, S, Hanson, J, Hirshman, S, Innocente, P, Jackson, J, Kiyama, S, Komm, M, Laguardia, L, Li, C, Liu, S, Liu, Y, Lorenzini, R, Luce, T, Luchetta, A, Maistrello, A, Manduchi, G, Mansfield, D, Marchiori, G, Marconato, N, Marocco, D, Marcuzzi, D, Martines, E, Martini, S, Matsunaga, G, Mazzitelli, G, Miorin, E, Momo, B, Moresco, M, Okabayashi, M, Olofsson, E, Paccagnella, R, Patel, N, Pavei, M, Peruzzo, S, Pilan, N, Pigatto, L, Piovan, R, Piovesan, P, Piron, C, Piron, L, Predebon, I, Rea, C, Recchia, M, Rigato, V, Rizzolo, A, Roquemore, A, Rostagni, G, Ruset, C, Ruzzon, A, Sajo-Bohus, L, Sakakita, H, Sanchez, R, Sarff, J, Sartori, E, Sattin, F, Scaggion, A, Scarin, P, Schmitz, O, Sonato, P, Spada, E, Spagnolo, S, Spolaore, M, Spong, D, Spizzo, G, Stevanato, L, Takechi, M, Taliercio, C, Terranova, D, Trevisan, G, Urso, G, Valente, M, Valisa, M, Veranda, M, Vianello, N, Viesti, G, Villone, F, Vincenzi, P, Visona', N, Wang, Z, White, R, Xanthopoulos, P, Xu, X, Yanovskiy, V, Zamengo, A, Zanca, P, Zaniol, B, Zanotto, L, Zilli, E, Zuin, M, Puiatti M E, Dal Bello S, Marrelli L, Martin P, Agostinetti P, Agostini M, Antoni V, Auriemma F, Barbisan M, Barbui T, Baruzzo M, Battistella M, Belli F, Bettini P, Bigi M, Bilel R, Boldrin M, Bolzonella T, Bonfiglio D, Brombin M, Buffa A, Canton A, Cappello S, Carraro L, Cavazzana R, Cester D, Chacon L, Chapman B E, Chitarin G, Ciaccio G, Cooper W A, Dalla Palma M, Deambrosis S, Delogu R, De Lorenzi A, De Masi G, Dong J Q, Escande D F, Esposito B, Fassina A, Fellin F, Ferro A, Finotti C, Franz P, Frassinetti L, Palumbo M Furno, Gaio E, Ghezzi F, Giudicotti L, Gnesotto F, Gobbin M, Gonzales W A, Grando L, Guo S C, Hanson J D, Hirshman S P, Innocente P, Jackson J L, Kiyama S, Komm M, Laguardia L, Li C, Liu S F, Liu Y Q, Lorenzini R, Luce T C, Luchetta A, Maistrello A, Manduchi G, Mansfield D K, Marchiori G, Marconato N, Marocco D, Marcuzzi D, Martines E, Martini S, Matsunaga G, Mazzitelli G, Miorin E, Momo B, Moresco M, Okabayashi M, Olofsson E, Paccagnella R, Patel N, Pavei M, Peruzzo S, Pilan N, Pigatto L, Piovan R, Piovesan P, Piron C, Piron L, Predebon I, Rea C, Recchia M, Rigato V, Rizzolo A, Roquemore A L, Rostagni G, Ruset C, Ruzzon A, Sajo-Bohus L, Sakakita H, Sanchez R, Sarff J S, Sartori E, Sattin F, Scaggion A, Scarin P, Schmitz O, Sonato P, Spada E, Spagnolo S, Spolaore M, Spong D A, Spizzo G, Stevanato L, Takechi M, Taliercio C, Terranova D, Trevisan G L, Urso G, Valente M, Valisa M, Veranda M, Vianello N, Viesti G, Villone F, Vincenzi P, Visona' N, Wang Z R, White R B, Xanthopoulos P, Xu X Y, Yanovskiy V, Zamengo A, Zanca P, Zaniol B, Zanotto L, Zilli E, Zuin M, Puiatti, M, Dal Bello, S, Marrelli, L, Martin, P, Agostinetti, P, Agostini, M, Antoni, V, Auriemma, F, Barbisan, M, Barbui, T, Baruzzo, M, Battistella, M, Belli, F, Bettini, P, Bigi, M, Bilel, R, Boldrin, M, Bolzonella, T, Bonfiglio, D, Brombin, M, Buffa, A, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Cester, D, Chacon, L, Chapman, B, Chitarin, G, Ciaccio, G, Cooper, W, Dalla Palma, M, Deambrosis, S, Delogu, R, De Lorenzi, A, De Masi, G, Dong, J, Escande, D, Esposito, B, Fassina, A, Fellin, F, Ferro, A, Finotti, C, Franz, P, Frassinetti, L, Palumbo, M, Gaio, E, Ghezzi, F, Giudicotti, L, Gnesotto, F, Gobbin, M, Gonzales, W, Grando, L, Guo, S, Hanson, J, Hirshman, S, Innocente, P, Jackson, J, Kiyama, S, Komm, M, Laguardia, L, Li, C, Liu, S, Liu, Y, Lorenzini, R, Luce, T, Luchetta, A, Maistrello, A, Manduchi, G, Mansfield, D, Marchiori, G, Marconato, N, Marocco, D, Marcuzzi, D, Martines, E, Martini, S, Matsunaga, G, Mazzitelli, G, Miorin, E, Momo, B, Moresco, M, Okabayashi, M, Olofsson, E, Paccagnella, R, Patel, N, Pavei, M, Peruzzo, S, Pilan, N, Pigatto, L, Piovan, R, Piovesan, P, Piron, C, Piron, L, Predebon, I, Rea, C, Recchia, M, Rigato, V, Rizzolo, A, Roquemore, A, Rostagni, G, Ruset, C, Ruzzon, A, Sajo-Bohus, L, Sakakita, H, Sanchez, R, Sarff, J, Sartori, E, Sattin, F, Scaggion, A, Scarin, P, Schmitz, O, Sonato, P, Spada, E, Spagnolo, S, Spolaore, M, Spong, D, Spizzo, G, Stevanato, L, Takechi, M, Taliercio, C, Terranova, D, Trevisan, G, Urso, G, Valente, M, Valisa, M, Veranda, M, Vianello, N, Viesti, G, Villone, F, Vincenzi, P, Visona', N, Wang, Z, White, R, Xanthopoulos, P, Xu, X, Yanovskiy, V, Zamengo, A, Zanca, P, Zaniol, B, Zanotto, L, Zilli, E, Zuin, M, Puiatti M E, Dal Bello S, Marrelli L, Martin P, Agostinetti P, Agostini M, Antoni V, Auriemma F, Barbisan M, Barbui T, Baruzzo M, Battistella M, Belli F, Bettini P, Bigi M, Bilel R, Boldrin M, Bolzonella T, Bonfiglio D, Brombin M, Buffa A, Canton A, Cappello S, Carraro L, Cavazzana R, Cester D, Chacon L, Chapman B E, Chitarin G, Ciaccio G, Cooper W A, Dalla Palma M, Deambrosis S, Delogu R, De Lorenzi A, De Masi G, Dong J Q, Escande D F, Esposito B, Fassina A, Fellin F, Ferro A, Finotti C, Franz P, Frassinetti L, Palumbo M Furno, Gaio E, Ghezzi F, Giudicotti L, Gnesotto F, Gobbin M, Gonzales W A, Grando L, Guo S C, Hanson J D, Hirshman S P, Innocente P, Jackson J L, Kiyama S, Komm M, Laguardia L, Li C, Liu S F, Liu Y Q, Lorenzini R, Luce T C, Luchetta A, Maistrello A, Manduchi G, Mansfield D K, Marchiori G, Marconato N, Marocco D, Marcuzzi D, Martines E, Martini S, Matsunaga G, Mazzitelli G, Miorin E, Momo B, Moresco M, Okabayashi M, Olofsson E, Paccagnella R, Patel N, Pavei M, Peruzzo S, Pilan N, Pigatto L, Piovan R, Piovesan P, Piron C, Piron L, Predebon I, Rea C, Recchia M, Rigato V, Rizzolo A, Roquemore A L, Rostagni G, Ruset C, Ruzzon A, Sajo-Bohus L, Sakakita H, Sanchez R, Sarff J S, Sartori E, Sattin F, Scaggion A, Scarin P, Schmitz O, Sonato P, Spada E, Spagnolo S, Spolaore M, Spong D A, Spizzo G, Stevanato L, Takechi M, Taliercio C, Terranova D, Trevisan G L, Urso G, Valente M, Valisa M, Veranda M, Vianello N, Viesti G, Villone F, Vincenzi P, Visona' N, Wang Z R, White R B, Xanthopoulos P, Xu X Y, Yanovskiy V, Zamengo A, Zanca P, Zaniol B, Zanotto L, Zilli E, and Zuin M

Abstract

The RFX-mod device is operated both as a reversed field pinch (RFP), where advanced regimes featuring helical shape develop, and as a tokamak. Due to its flexibility, RFX-mod is contributing to the solution of key issues in the roadmap to ITER and DEMO, including MHD instability control, internal transport barriers, edge transport and turbulence, isotopic effect, high density limit and three-dimensional (3D) non-linear MHD modelling. This paper reports recent advancements in the understanding of the self-organized helical states, featuring a strong electron transport barrier, in the RFP configuration; the physical mechanism driving the residual transport at the barrier has been investigated. Following the first experiments with deuterium as the filling gas, new results concerning the isotope effect in the RFP are discussed. Studies on the high density limit show that in the RFP it is related to a toroidal particle accumulation due to the onset of a convective cell. In the tokamak configuration, q(a) regimes down to q(a) = 1.2 have been pioneered, with (2,1) tearing mode (TM) mitigated and (2,1) resistive wall mode (RWM) stabilized: the control of such modes can be obtained both by poloidal and radial sensors. Progress has been made in the avoidance of disruptions due to the (2,1) TM by applying q(a) control, and on the general issue of error field control. The effect of externally applied 3D fields on plasma flow and edge turbulence, sawtooth control and runaway electron decorrelation has been analysed. The experimental program is supported by substantial theoretical activity: 3D non-linear visco-resistive MHD and non-local transport modelling have been advanced; RWMs have been studied by a toroidal MHD kinetic hybrid stability code.

Published
2015

34. A power-balance model of the density limit in fusion plasmas: application to the L-mode tokamak

Author

Zanca, P., Sattin, F., Escande, D. F., Abduallev, S., Abhangi, M., Abreu, P., Afzal, M., Aggarwal, K. M., Ahlgren, T., Ahn, J. H., Aho-Mantila, L., Aiba, N., Airila, M., Albanese, R., Aldred, V., Alegre, D., Alessi, E., Aleynikov, P., Alfier, A., Alkseev, A., Allinson, M., Alper, B., Alves, E., Ambrosino, G., Ambrosino, R., Amicucci, L., Amosov, V., Sunden, E. Andersson, Angelone, M., Anghel, M., Angioni, C., Appel, L., Appelbee, C., Arena, P., Ariola, M., Arnichand, H., Arshad, S., Ash, A., Ashikawa, N., Aslanyan, V., Asunta, O., Auriemma, F., Austin, Y., Avotina, L., Axton, M. D., Ayres, C., Bacharis, M., Baciero, A., Baiao, D., Bailey, S., Baker, A., Balboa, I., Balden, M., Balshaw, N., Bament, R., Banks, J. W., Baranov, Y. F., Barnard, M. A., Barnes, D., Barnes, M., Barnsley, R., Wiechec, A. Baron, Orte, L. Barrera, Baruzzo, M., Basiuk, V., Bassan, M., Bastow, R., Batista, A., Batistoni, P., Baughan, R., Bauvir, B., Baylor, L., Bazylev, B., Beal, J., Beaumont, P. S., Beckers, M., Beckett, B., Becoulet, A., Bekris, N., Beldishevski, M., Bell, K., Belli, F., Bellinger, M., Belonohy, E., Ben Ayed, N., Benterman, N. A., Bergsaker, H., Bernardo, J., Bernert, M., Berry, M., Bertalot, L., Besliu, C., Beurskens, M., Bieg, B., Bielecki, J., Biewer, T., Bigi, M., Bilkova, P., Binda, F., Bisoffi, A., Bizarro, J. P. S., Bjorkas, C., Blackburn, J., Blackman, K., Blackman, T. R., Blanchard, P., Blatchford, P., Bobkov, V., Boboc, A., Bodnar, G., Bogar, O., Bolshakova, I., Bolzonella, T., Bonanomi, N., Bonelli, F., Boom, J., Booth, J., Borba, D., Borodin, D., Borodkina, I., Botrugno, A., Bottereau, C., Boulting, P., Bourdelle, C., Bowden, M., Bower, C., Bowman, C., Boyce, T., Boyd, C., Boyer, H. J., Bradshaw, J. M. A., Braic, V., Bravanec, R., Breizman, B., Bremond, S., Brennan, P. D., Breton, S., Brett, A., Brezinsek, S., Bright, M. D. J., Brix, M., Broeckx, W., Brombin, M., Broslawski, A., Brown, D. P. D., Brown, M., Bruno, E., Bucalossi, J., Buch, J., Buchanan, J., Buckley, M. A., Budny, R., Bufferand, H., Bulman, M., Bulmer, N., Bunting, P., Buratti, P., Burckhart, A., Buscarino, A., Busse, A., Butler, N. K., Bykov, I., Byrne, J., Cahyna, P., Calabro, G., Calvo, I., Camenen, Y., Camp, P., Campling, D. C., Cane, J., Cannas, B., Capel, A. J., Card, P. J., Cardinali, A., Carman, P., Carr, M., Carralero, D., Carraro, L., Carvalho, B. B., Carvalho, I., Carvalho, P., Casson, F. J., Castaldo, C., Catarino, N., Caumont, J., Causa, F., Cavazzana, R., Cave-Ayland, K., Cavinato, M., Cecconello, M., Ceccuzzi, S., Cecil, E., Cenedese, A., Cesario, R., Challis, C. D., Chandler, M., Chandra, D., Chang, C. S., Chankin, A., Chapman, I. T., Chapman, S. C., Chernyshova, M., Chitarin, G., Ciraolo, G., Ciric, D., Citrin, J., Clairet, F., Clark, E., Clark, M., Clarkson, R., Clatworthy, D., Clements, C., Cleverly, M., Coad, J. P., Coates, P. A., Cobalt, A., Coccorese, V., Cocilovo, V., Coda, S., Coelho, R., Coenen, J. W., Coffey, I., Colas, L., Collins, S., Conka, D., Conroy, S., Conway, N., Coombs, D., Cooper, D., Cooper, S. R., Corradino, C., Corre, Y., Corrigan, G., Cortes, S., Coster, D., Couchman, A. S., Cox, M. P., Craciunescu, T., Cramp, S., Craven, R., Crisanti, F., Croci, G., Croft, D., Crombe, K., Crowe, R., Cruz, N., Cseh, G., Cufar, A., Cullen, A., Curuia, M., Czarnecka, A., Dabirikhah, H., Dalgliesh, P., Dalley, S., Dankowski, J., Darrow, D., Davies, O., Davis, W., Day, C., Day, I. E., De Bock, M., de Castro, A., de la Cal, E., de la Luna, E., De Masi, G., de Pablos, J. L., De Temmerman, G., De Tommasi, G., de Vries, P., Deakin, K., Deane, J., Agostini, F. Degli, Dejarnac, R., Delabie, E., den Harder, N., Dendy, R. O., Denis, J., Denner, P., Devaux, S., Devynck, P., Di Maio, F., Di Siena, A., Di Troia, C., Dinca, P., D'Inca, R., Ding, B., Dittmar, T., Doerk, H., Doerner, R. P., Donne, T., Dorling, S. 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Subjects
Nuclear and High Energy Physics, Física [Ciências exactas e naturais], Tokamak, Radiation, 01 natural sciences, 7. Clean energy, 010305 fluids & plasmas, law.invention, Física, Física, Physical sciences [Natural sciences], magnetohydrodynamics, transport, radiation, CONFINEMENT, OPERATION, Physics::Plasma Physics, Power Balance, law, Impurity, 0103 physical sciences, 010306 general physics, Physics, Physical sciences, Physics, Reversed field pinch, Mode (statistics), Condensed Matter Physics, Computational physics, operation, confinement, Magnetohydrodynamics, Stellarator
Abstract

A power-balance model, with radiation losses from impurities and neutrals, gives a unified description of the density limit (DL) of the stellarator, the L-mode tokamak, and the reversed field pinch (RFP). The model predicts a Sudo-like scaling for the stellarator, a Greenwald- like scaling, alpha I-p(8/9), for the RFP and the ohmic tokamak, a mixed scaling, alpha (PIp4/9)-I-4/9, for the additionally heated L-mode tokamak. In a previous paper (Zanca et al 2017 Nucl. Fusion 57 056010) the model was compared with ohmic tokamak, RFP and stellarator experiments. Here, we address the issue of the DL dependence on heating power in the L-mode tokamak. Experimental data from high-density disrupted L-mode discharges performed at JET, as well as in other machines, arc taken as a term of comparison. The model fits the observed maximum densities better than the pure Greenwald limit.

Published
2019

35. Overview of the RFX-mod fusion science activity

Author

Zuin, M., Dal Bello, S., Marrelli, L., Puiatti, M. E., Agostinetti, P., Agostini, M., Antoni, V., Auriemma, F., Barbisan, M., Barbui, T., Baruzzo, M., Belli, F., Bettini, P., Bigi, M., Bilel, R., Boldrin, M., Bolzonella, T., Bonfiglio, D., Brombin, M., Buffa, A., Bustreo, C., Canton, A., Cappello, S., Carraro, L., Cavazzana, R., Cester, D., Chacon, L., Chitarin, G., Cooper, W. A., Cordaro, L., Palma, M. Dalla, Deambrosis, S., Delogu, R., De Lorenzi, A., De Masi, G., Dong, J. Q., Escande, D. F., Fassina, A., Felici, F., Ferro, A., Finotti, C., Franz, P., Frassinetti, Lorenzo, Gaio, E., Ghezzi, F., Giudicotti, L., Gnesotto, F., Gobbin, M., Gonzalez, W. A., Grando, L., Guo, S. C., Hanson, J. D., Hirshman, S. P., Innocente, P., Jackson, J. L., Kiyama, S., Komm, M., Kudlacek, O., Laguardia, L., Li, C., Liu, B., Liu, S. F., Liu, Y. Q., Lopez-Bruna, D., Lorenzini, R., Luce, T. C., Luchetta, A., Maistrello, A., Manduchi, G., Mansfield, D. K., Marchiori, G., Marconato, N., Marcuzzi, D., Martin, P., Martines, E., Martini, S., Mazzitelli, G., McCormack, O., Miorin, E., Momo, B., Moresco, M., Narushima, Y., Okabayashi, M., Paccagnella, R., Patel, N., Pavei, M., Peruzzo, S., Pilan, N., Pigatto, L., Piovan, R., Piovesan, P., Piron, C., Piron, L., Predebon, I., Pucella, G., Rea, C., Recchia, M., Rizzolo, A., Rostagni, G., Ruset, C., Sajo-Bohus, L., Sakakita, H., Sanchez, R., Sarff, J. S., Sattin, F., Scarin, P., Schmitz, O., Schneider, W., Siragusa, M., Sonato, P., Spada, E., Spagnolo, S., Spolaore, M., Spong, D. A., Spizzo, G., Stevanato, L., Suzuki, Y., Taliercio, C., Terranova, D., Tudisco, O., Urso, G., Valente, M., Valisa, M., Vallar, M., Veranda, M., Vianello, N., Villone, F., Vincenzi, P., Visona, N., White, R. B., Xanthopoulos, P., Xu, X. Y., Yanovskiy, V., Zamengo, A., Zanca, P., Zaniol, B., Zanotto, L., Zhang, Y., Zilli, E., Zuin, M., Dal Bello, S., Marrelli, L., Puiatti, M. E., Agostinetti, P., Agostini, M., Antoni, V., Auriemma, F., Barbisan, M., Barbui, T., Baruzzo, M., Belli, F., Bettini, P., Bigi, M., Bilel, R., Boldrin, M., Bolzonella, T., Bonfiglio, D., Brombin, M., Buffa, A., Bustreo, C., Canton, A., Cappello, S., Carraro, L., Cavazzana, R., Cester, D., Chacon, L., Chitarin, G., Cooper, W. A., Cordaro, L., Palma, M. Dalla, Deambrosis, S., Delogu, R., De Lorenzi, A., De Masi, G., Dong, J. Q., Escande, D. F., Fassina, A., Felici, F., Ferro, A., Finotti, C., Franz, P., Frassinetti, Lorenzo, Gaio, E., Ghezzi, F., Giudicotti, L., Gnesotto, F., Gobbin, M., Gonzalez, W. A., Grando, L., Guo, S. C., Hanson, J. D., Hirshman, S. P., Innocente, P., Jackson, J. L., Kiyama, S., Komm, M., Kudlacek, O., Laguardia, L., Li, C., Liu, B., Liu, S. F., Liu, Y. Q., Lopez-Bruna, D., Lorenzini, R., Luce, T. C., Luchetta, A., Maistrello, A., Manduchi, G., Mansfield, D. K., Marchiori, G., Marconato, N., Marcuzzi, D., Martin, P., Martines, E., Martini, S., Mazzitelli, G., McCormack, O., Miorin, E., Momo, B., Moresco, M., Narushima, Y., Okabayashi, M., Paccagnella, R., Patel, N., Pavei, M., Peruzzo, S., Pilan, N., Pigatto, L., Piovan, R., Piovesan, P., Piron, C., Piron, L., Predebon, I., Pucella, G., Rea, C., Recchia, M., Rizzolo, A., Rostagni, G., Ruset, C., Sajo-Bohus, L., Sakakita, H., Sanchez, R., Sarff, J. S., Sattin, F., Scarin, P., Schmitz, O., Schneider, W., Siragusa, M., Sonato, P., Spada, E., Spagnolo, S., Spolaore, M., Spong, D. A., Spizzo, G., Stevanato, L., Suzuki, Y., Taliercio, C., Terranova, D., Tudisco, O., Urso, G., Valente, M., Valisa, M., Vallar, M., Veranda, M., Vianello, N., Villone, F., Vincenzi, P., Visona, N., White, R. B., Xanthopoulos, P., Xu, X. Y., Yanovskiy, V., Zamengo, A., Zanca, P., Zaniol, B., Zanotto, L., Zhang, Y., and Zilli, E.

Abstract

This paper reports the main recent results of the RFX-mod fusion science activity. The RFX-mod device is characterized by a unique flexibility in terms of accessible magnetic configurations. Axisymmetric and helically shaped reversed-field pinch equilibria have been studied, along with tokamak plasmas in a wide range of q(a) regimes (spanning from 4 down to 1.2 values). The full range of magnetic configurations in between the two, the so-called ultra-low q ones, has been explored, with the aim of studying specific physical issues common to all equilibria, such as, for example, the density limit phenomenon. The powerful RFX-mod feedback control system has been exploited for MHD control, which allowed us to extend the range of experimental parameters, as well as to induce specific magnetic perturbations for the study of 3D effects. In particular, transport, edge and isotope effects in 3D equilibria have been investigated, along with runaway mitigations through induced magnetic perturbations. The first transitions to an improved confinement scenario in circular and D-shaped tokamak plasmas have been obtained thanks to an active modification of the edge electric field through a polarized electrode. The experiments are supported by intense modeling with 3D MHD, gyrokinetic, guiding center and transport codes. Proposed modifications to the RFX-mod device, which will enable further contributions to the solution of key issues in the roadmap to ITER and DEMO, are also briefly presented., QC 20170802

Published
2017
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36. Progress in theoretical RFP studies: new stimulated helical regimes and similarities with tokamak and stellarator

Author

Bonfiglio D., Cappello S., Veranda M., Agostini M., Borgogno D., Chacon L., Escande D. F., Fassina A., Franz P., Gobbin M., Grasso D., Piovesan P., Predebon I., Puiatti M.E., Rubino G., Sattin F., and Zuin M.

Subjects
Physics::Plasma Physics
Abstract

Recent theoretical studies of the reversed-field pinch (RFP) have demonstrated the possibility of stimulating new quasi-single helicity (QSH) regimes by allowing a small helical deformation of the magnetic boundary. In particular, QSH states based on non-resonant helicities are predicted to be more resilient to magnetic stochasticity induced by secondary modes. This has motivated a series of successful experiments in the RFX-mod device with applied magnetic perturbations (MPs). We present here recent developments in nonlinear MHD modeling of RFP, highlighting aspects which share similarities between the RFP helical regimes, the tokamak sawtoothing and the stellarator. RFP helical configurations are obtained by applying small helical MPs with resonant (n 7) and non-resonant (n < 7) toroidal periodicities. MPs turn out to be a powerful tool for varying the helical equilibrium properties, like the helical safety factor or the magnetic well profile. The width of the region of conserved magnetic surfaces turns out to be the largest for the non-resonant case. By using a method to compute Lagrangian Coherent Structures, barriers to the diffusion of magnetic field lines are diagnosed in the weakly stochastic region surrounding the conserved helical core in numerical QSH states, providing a new tool for the study of Internal Transport Barriers formation at the transition to helical regimes in RFP experiments. Similar to the tokamak configuration, the sawtoothing dynamics of RFP plasmas is mitigated with the application of helical MPs. As for the edge region, the RFP is characterized by m = 0 island chains at the q = 0 reversal surface, which play a role similar to edge islands in tokamak and stellarator plasmas.

Published
2016

37. The Reversed Field Pinch as neutron source for Fusion-Fission Hybrid systems: strengths and issues

Author

Piovan R., Bustreo C., Carraro L., Escande D., Martini S., Puiatti M.E., Valisa M., Zuin M., and Zollino G.

Subjects
Physics::Plasma Physics
Abstract

The fusion reactor remains one of the long term, final solution of energy production. This requires to control fusion reaction with an energy gain Q > 30 - 40. The tokamak configuration is nowadays the most investigated path to this goal. Meanwhile a proposed interim carbon-free solution, with the merit of nuclear waste transmutation, is the hybrid fusion-fission reactor, in which sub-critical fission is activated by fast neutron generated in a fusion reactor. In this case fusion could be produced in a device with lower Q, roughly in the order of 1. The Reversed Field Pinch (RFP) is an alternative configuration to tokamak and stellarator for the future fusion reactor. Its disruption-free configuration, the need of much weaker toroidal magnetic field and the capability of reaching thermonuclear temperatures without additional heating, are relevant advantages in a commercial reactor. While RFP plasmas have yet an energy confinement too low for a high Q reactor, reaching Q near 1 might be reasonable for a RFP machine with an appropriate R&D activity. Starting from the present knowledge in RFP configuration, the experimental results from the different machines and the theoretical advancement obtained in the last years, an analysis is presented on the possibility to use the RFP configuration as a fast neutron generator. It will be highlighted the advantages of this solution with respect to the tokamak - no disruption, toroidal field coils at room temperature and reduced size with more space for breeding blanket, superconductors limited to the magnetizing coil and no divertor - and the possible issues, as steady state operation.

Published
2016

39. Overview of the RFX-mod fusion science programme

Author

Martin, P, Puiatti, M, Agostinetti, P, Agostini, M, Alonso, J, Antoni, V, Apolloni, L, Auriemma, F, Avino, F, Barbalace, A, Barbisan, M, Barbui, T, Barison, S, Barp, M, Baruzzo, M, Bettini, P, Bigi, M, Bilel, R, Boldrin, M, Bolzonella, T, Bonfiglio, D, Bonomo, F, Brombin, M, Buffa, A, Bustreo, C, Canton, A, Cappello, S, Carralero, D, Carraro, L, Cavazzana, R, Chacon, L, Chapman, B, Chitarin, G, Ciaccio, G, Cooper, W, Dal Bello, S, Dalla Palma, M, Delogu, R, De Lorenzi, A, Delzanno, G, De Masi, G, De Muri, M, Dong, J, Escande, D, Fantini, F, Fasoli, A, Fassina, A, Fellin, F, Ferro, A, Fiameni, S, Finn, J, Finotti, C, Fiorentin, A, Fonnesu, N, Framarin, J, Franz, P, Frassinetti, L, Furno, I, Palumbo, M, Gaio, E, Gazza, E, Ghezzi, F, Giudicotti, L, Gnesotto, F, Gobbin, M, Gonzales, W, Grando, L, Guo, S, Hanson, J, Hidalgo, C, Hirano, Y, Hirshman, S, Ide, S, In, Y, Innocente, P, Jackson, G, Kiyama, S, Liu, S, Liu, Y, Lopez Bruna, D, Lorenzini, R, Luce, T, Luchetta, A, Maistrello, A, Manduchi, G, Mansfield, D, Marchiori, G, Marconato, N, Marcuzzi, D, Marrelli, L, Martini, S, Matsunaga, G, Martines, E, Mazzitelli, G, Mccollam, K, Momo, B, Moresco, M, Munaretto, S, Novello, L, Okabayashi, M, Olofsson, E, Paccagnella, R, Pasqualotto, R, Pavei, M, Peruzzo, S, Pesce, A, Pilan, N, Piovan, R, Piovesan, P, Piron, C, Piron, L, Pomaro, N, Predebon, I, Recchia, M, Rigato, V, Rizzolo, A, Roquemore, A, Rostagni, G, Ruzzon, A, Sakakita, H, Sanchez, R, Sarff, J, Sartori, E, Sattin, F, Scaggion, A, Scarin, P, Schneider, W, Serianni, G, Sonato, P, Spada, E, Soppelsa, A, Spagnolo, S, Spolaore, M, Spong, D, Spizzo, G, Takechi, M, Taliercio, C, Terranova, D, Theiler, C, Toigo, V, Trevisan, G, Valente, M, Valisa, M, Veltri, P, Veranda, M, Vianello, N, Villone, F, Wang, Z, White, R, Xu, X, Zaccaria, P, Zamengo, A, Zanca, P, Zaniol, B, Zanotto, L, Zilli, E, Zollino, G, Zuin, M, Martin P, Puiatti M E, Agostinetti P, Agostini M, Alonso J A, Antoni V, Apolloni L, Auriemma F, Avino F, Barbalace A, Barbisan M, Barbui T, Barison S, Barp M, Baruzzo M, Bettini P, Bigi M, Bilel R, Boldrin M, Bolzonella T, Bonfiglio D, Bonomo F, Brombin M, Buffa A, Bustreo C, Canton A, Cappello S, Carralero D, Carraro L, Cavazzana R, Chacon L, Chapman B, Chitarin G, Ciaccio G, Cooper W A, Dal Bello S, Dalla Palma M, Delogu R, De Lorenzi A, Delzanno G L, De Masi G, De Muri M, Dong J Q, Escande D F, Fantini F, Fasoli A, Fassina A, Fellin F, Ferro A, Fiameni S, Finn J M, Finotti C, Fiorentin A, Fonnesu N, Framarin J, Franz P, Frassinetti L, Furno I, Palumbo M Furno, Gaio E, Gazza E, Ghezzi F, Giudicotti L, Gnesotto F, Gobbin M, Gonzales W A, Grando L, Guo S C, Hanson J D, Hidalgo C, Hirano Y, Hirshman S P, Ide S, In Y, Innocente P, Jackson G L, Kiyama S, Liu S F, Liu Y Q, Lopez Bruna D, Lorenzini R, Luce T C, Luchetta A, Maistrello A, Manduchi G, Mansfield D K, Marchiori G, Marconato N, Marcuzzi D, Marrelli L, Martini S, Matsunaga G, Martines E, Mazzitelli G, McCollam K, Momo B, Moresco M, Munaretto S, Novello L, Okabayashi M, Olofsson E, Paccagnella R, Pasqualotto R, Pavei M, Peruzzo S, Pesce A, Pilan N, Piovan R, Piovesan P, Piron C, Piron L, Pomaro N, Predebon I, Recchia M, Rigato V, Rizzolo A, Roquemore A L, Rostagni G, Ruzzon A, Sakakita H, Sanchez R, Sarff J S, Sartori E, Sattin F, Scaggion A, Scarin P, Schneider W, Serianni G, Sonato P, Spada E, Soppelsa A, Spagnolo S, Spolaore M, Spong D A, Spizzo G, Takechi M, Taliercio C, Terranova D, Theiler C, Toigo V, Trevisan G L, Valente M, Valisa M, Veltri P, Veranda M, Vianello N, Villone F, Wang Z R, White R B, Xu X Y, Zaccaria P, Zamengo A, Zanca P, Zaniol B, Zanotto L, Zilli E, Zollino G, Zuin M, Martin, P, Puiatti, M, Agostinetti, P, Agostini, M, Alonso, J, Antoni, V, Apolloni, L, Auriemma, F, Avino, F, Barbalace, A, Barbisan, M, Barbui, T, Barison, S, Barp, M, Baruzzo, M, Bettini, P, Bigi, M, Bilel, R, Boldrin, M, Bolzonella, T, Bonfiglio, D, Bonomo, F, Brombin, M, Buffa, A, Bustreo, C, Canton, A, Cappello, S, Carralero, D, Carraro, L, Cavazzana, R, Chacon, L, Chapman, B, Chitarin, G, Ciaccio, G, Cooper, W, Dal Bello, S, Dalla Palma, M, Delogu, R, De Lorenzi, A, Delzanno, G, De Masi, G, De Muri, M, Dong, J, Escande, D, Fantini, F, Fasoli, A, Fassina, A, Fellin, F, Ferro, A, Fiameni, S, Finn, J, Finotti, C, Fiorentin, A, Fonnesu, N, Framarin, J, Franz, P, Frassinetti, L, Furno, I, Palumbo, M, Gaio, E, Gazza, E, Ghezzi, F, Giudicotti, L, Gnesotto, F, Gobbin, M, Gonzales, W, Grando, L, Guo, S, Hanson, J, Hidalgo, C, Hirano, Y, Hirshman, S, Ide, S, In, Y, Innocente, P, Jackson, G, Kiyama, S, Liu, S, Liu, Y, Lopez Bruna, D, Lorenzini, R, Luce, T, Luchetta, A, Maistrello, A, Manduchi, G, Mansfield, D, Marchiori, G, Marconato, N, Marcuzzi, D, Marrelli, L, Martini, S, Matsunaga, G, Martines, E, Mazzitelli, G, Mccollam, K, Momo, B, Moresco, M, Munaretto, S, Novello, L, Okabayashi, M, Olofsson, E, Paccagnella, R, Pasqualotto, R, Pavei, M, Peruzzo, S, Pesce, A, Pilan, N, Piovan, R, Piovesan, P, Piron, C, Piron, L, Pomaro, N, Predebon, I, Recchia, M, Rigato, V, Rizzolo, A, Roquemore, A, Rostagni, G, Ruzzon, A, Sakakita, H, Sanchez, R, Sarff, J, Sartori, E, Sattin, F, Scaggion, A, Scarin, P, Schneider, W, Serianni, G, Sonato, P, Spada, E, Soppelsa, A, Spagnolo, S, Spolaore, M, Spong, D, Spizzo, G, Takechi, M, Taliercio, C, Terranova, D, Theiler, C, Toigo, V, Trevisan, G, Valente, M, Valisa, M, Veltri, P, Veranda, M, Vianello, N, Villone, F, Wang, Z, White, R, Xu, X, Zaccaria, P, Zamengo, A, Zanca, P, Zaniol, B, Zanotto, L, Zilli, E, Zollino, G, Zuin, M, Martin P, Puiatti M E, Agostinetti P, Agostini M, Alonso J A, Antoni V, Apolloni L, Auriemma F, Avino F, Barbalace A, Barbisan M, Barbui T, Barison S, Barp M, Baruzzo M, Bettini P, Bigi M, Bilel R, Boldrin M, Bolzonella T, Bonfiglio D, Bonomo F, Brombin M, Buffa A, Bustreo C, Canton A, Cappello S, Carralero D, Carraro L, Cavazzana R, Chacon L, Chapman B, Chitarin G, Ciaccio G, Cooper W A, Dal Bello S, Dalla Palma M, Delogu R, De Lorenzi A, Delzanno G L, De Masi G, De Muri M, Dong J Q, Escande D F, Fantini F, Fasoli A, Fassina A, Fellin F, Ferro A, Fiameni S, Finn J M, Finotti C, Fiorentin A, Fonnesu N, Framarin J, Franz P, Frassinetti L, Furno I, Palumbo M Furno, Gaio E, Gazza E, Ghezzi F, Giudicotti L, Gnesotto F, Gobbin M, Gonzales W A, Grando L, Guo S C, Hanson J D, Hidalgo C, Hirano Y, Hirshman S P, Ide S, In Y, Innocente P, Jackson G L, Kiyama S, Liu S F, Liu Y Q, Lopez Bruna D, Lorenzini R, Luce T C, Luchetta A, Maistrello A, Manduchi G, Mansfield D K, Marchiori G, Marconato N, Marcuzzi D, Marrelli L, Martini S, Matsunaga G, Martines E, Mazzitelli G, McCollam K, Momo B, Moresco M, Munaretto S, Novello L, Okabayashi M, Olofsson E, Paccagnella R, Pasqualotto R, Pavei M, Peruzzo S, Pesce A, Pilan N, Piovan R, Piovesan P, Piron C, Piron L, Pomaro N, Predebon I, Recchia M, Rigato V, Rizzolo A, Roquemore A L, Rostagni G, Ruzzon A, Sakakita H, Sanchez R, Sarff J S, Sartori E, Sattin F, Scaggion A, Scarin P, Schneider W, Serianni G, Sonato P, Spada E, Soppelsa A, Spagnolo S, Spolaore M, Spong D A, Spizzo G, Takechi M, Taliercio C, Terranova D, Theiler C, Toigo V, Trevisan G L, Valente M, Valisa M, Veltri P, Veranda M, Vianello N, Villone F, Wang Z R, White R B, Xu X Y, Zaccaria P, Zamengo A, Zanca P, Zaniol B, Zanotto L, Zilli E, Zollino G, and Zuin M

Abstract

This paper reports the highlights of the RFX-mod fusion science programme since the last 2010 IAEA Fusion Energy Conference. The RFX-mod fusion science programme focused on two main goals: exploring the fusion potential of the reversed field pinch (RFP) magnetic configuration and contributing to the solution of key science and technology problems in the roadmap to ITER. Active control of several plasma parameters has been a key tool in this endeavour. New upgrades on the system for active control of magnetohydrodynamic (MHD) stability are underway and will be presented in this paper. Unique among the existing fusion devices, RFX-mod has been operated both as an RFP and as a tokamak. The latter operation has allowed the exploration of edge safety factor q(edge) < 2 with active control of MHD stability and studies concerning basic energy and flow transport mechanisms. Strong interaction has continued with the stellarator community in particular on the physics of helical states and on three-dimensional codes.

Published
2013

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

Author

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

Abstract

RFX-mod [Sonato et al., Fusion Eng. Des. 66, 161 (2003)] exploits its 192 active coils in both reversed-field pinch (RFP) and tokamak configurations with varying degrees of 3D shaping, providing also a test bed for validating stellarator codes and 3D nonlinear magnetohydrodynamic codes. This makes RFX-mod a unique and flexible facility for comparative studies on 3D shaping and control. The paper discusses how 3D fields allow access to RFP and tokamak advanced regimes. 3D fields are used to feedback control Single Helicity (SH) RFP equilibria with 1/7 helicity up to similar to 2 MA. They also allow accessing SH regimes with higher density (Greenwald fraction up to 0.5), presently inaccessible in spontaneous SH regimes. Feedback on the 2/1 resistive-wall mode in RFX-mod tokamak plasmas allows for safe operation at q(a) < 2, an almost unexplored promising regime. Forcing the 2/1 mode to saturate at finite but small level, a helical tokamak equilibrium with significant n=1 modulation is produced and a new way to tailor sawteeth is found. The effects of different levels of 3D shaping on momentum transport in both RFP and tokamak helical states are discussed.

Published
2013

43. Equilibrium reconstruction in RFP SHAx states using Newcomb's equation

Author

Momo, B, Martines, E, Escande, D, Alfier, A, Fassina, A, Innocente, P, Lorenzini, R, Terranova, D, Zanca, P, Momo B, Martines E, Escande D, Alfier A, Fassina A, Innocente P, Lorenzini R, Terranova D, Zanca P, Momo, B, Martines, E, Escande, D, Alfier, A, Fassina, A, Innocente, P, Lorenzini, R, Terranova, D, Zanca, P, Momo B, Martines E, Escande D, Alfier A, Fassina A, Innocente P, Lorenzini R, Terranova D, and Zanca P

Published
2010

44. 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. F., Fassina, Alessandro, Gobbin, M., Lorenzini, R., Marrelli, L., Martin, Piero, Martines, E., Pasqualotto, R., Puiatti, M. E., Spolaore, M., Valisa, M., Vianello, N., Zanca, P., THE RFX MOD TEAM, 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, and Zanca, P

Subjects
Physics, Nuclear and High Energy Physics, RFX-mod, Condensed matter physics, MHD, Magnetic confinement fusion, Plasma, reversed field pinch, Condensed Matter Physics, self-organization, Computational physics, Magnetic field, quasi-single helicity, Physics::Plasma Physics, numerical mhd simulation, transport, Pinch, RFP, Electron temperature, QSH, Magnetohydrodynamic drive, magnetic topology, Current (fluid), Magnetohydrodynamics
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.

Published
2009

45. 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, 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, 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. S., Dalla Palma M., De Lorenzi A., De 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, 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. S., Dalla Palma M., De Lorenzi A., De 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., and Zuin M.

Published
2005

46. Progress in Theoretical Studies of Resistive Wall Modes for RFP plasmas and Comparison with Tokamaks

Author

Guo S., Xu X.Y., Liu Y.Q., Baruzzo M., Bolzonella T., Wang Z.R., Cappello S., Veranda M., Bonfiglio D., and Escande D.

Subjects
Physics::Plasma Physics
Abstract

Recent results of the theoretic studies on Resistive Wall Modes (RWM) in Reversed Field Pinch (RFP) plasmas are reported. Different features of RWM instabilities between RFP and tokamak are investigated in order to provide in-depth understanding on RWM physics. The toroidal MHD-kinetic hybrid stability code MARS-K r 1 s was applied to the studies, taking into account the full kinetic effects of the thermal particles and the isotropic/anisotropic Energetic Particles (EP). A brief summary on the characteristics of RWMs in RFP configuration are presented. Especially, due to the different mechanisms of the kinetic damping, the stabilization of RWMs in RFPs requires a plasma rotation at least in the range of the ion acoustic frequency; whereas only very slow, even vanishing rotation is required for stabilizing the pressure driven RWMs in the tokamak plasmas. The shaped cross section of the RFP plasmas leads to a lower ideal wall limit than that of the circular one; and does not bring an appreciable benefit in kinetic damping on RWMs. The physics mechanism leading to the conclusion is provided by the analysis. The energetic particle effects on RWMs in RFP plasmas are also investigated. Furthermore, a non-resonant fishbone-like mode (FLM) in RFP plasmas is predicted. The FLM instability is an external kink mode, which can be driven by the resonance of the precession drift of the trapped EPs under certain condition, even for a RFP with an ideal wall. The kinetic effect of thermal particles plays a stabilizing role on FLMs in RFPs. Different features of FLM instabilities in RFP and tokamak plasmas are discussed. 3D magnetic perturbation of RWMs can induce neoclassical toroidal viscosity (NTV) in RFP plasmas. The preliminary results will be presented and discussed. Example of the experimental study on RWM in RFX-mod, correlated to the theory, will be presented. In a complementary way, the possibility to exploit the internally nonresonant kink instability to build up 3D RFP helical state is studied by means of the 3D nonlinear MHD visco-resistive codes SpeCyl and PIXIE3D r 2 s . References r 1 s Y.Q. Liu, et al. , PoP 15, 112503 (2008). r 2 s S. Cappello, et al. , Proc 24th IAEA FEC (2012).

Published
2014

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

Author

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, Zollino, G, 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 SC, 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 ME, 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, Zollino G, 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, Zollino, G, 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 SC, 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 ME, 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

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
2002

48. Transport mechanisms and enhanced confinement studies in RFX

Author

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, Zollino, G, 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 SC, 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 ME, 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, Zollino G, 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, Zollino, G, 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 SC, 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 ME, 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

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

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