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1. Active MHD control at high currents in RFX-mod

Author

Emilio Martines, Lorella Carraro, A. Pizzimenti, D. Terranova, Paolo Franz, M. Brombin, P. Zaccaria, Rita Lorenzini, V. Antoni, E. Spada, Mario Cavinato, Roberto Cavazzana, S. Cappello, G. Rostagni, F. Milani, Paolo Zanca, L. Apolloni, N. Vianello, Vanni Toigo, L. Zanotto, C. Taliercio, N. Pomaro, Gianluca Spizzo, Giuseppe Zollino, Giuseppe Chitarin, C. Taccon, Barbara Zaniol, Federica Bonomo, A. Murari, A. De Lorenzi, Alessandra Canton, Matteo Zuin, Fulvio Auriemma, L. Garzotti, S. Ortolani, R. Paccagnella, S. C. Guo, Anton Soppelsa, Maria Ester Puiatti, Lionello Marrelli, Tommaso Bolzonella, Gabriele Manduchi, F. Sattin, S. Martini, Alessandro Fassina, G. Malesani, Luca Grando, P. Innocente, Giuseppe Marchiori, P. Piovesan, C. Alessi, D. F. Escande, Roberto Pasqualotto, L. De Pasqual, D. Bonfiglio, M. Valisa, Enrico Zilli, A. Cravotta, Paolo Bettini, A. Masiello, Matteo Agostini, R. Piovan, Diego Marcuzzi, G. Gadani, Piergiorgio Sonato, Alberto Alfier, L. Novello, Simone Peruzzo, Elena Gaio, S. Dal Bello, M. Spolaore, Piero Martin, E. Gazza, Francesco Gnesotto, Adriano Luchetta, Leonardo Giudicotti, P. Scarin, A. Buffa, Marco Gobbin, M. Moresco, G. Serianni, Martini, S, Agostini, M, Alessi, C, Alfier, A, Antoni, V, Apolloni, L, Auriemma, F, Bettini, P, Bolzonella, T, Bonfiglio, D, Bonomo, F, Brombin, M, Buffa, A, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Cavinato, M, Chitarin, G, Cravotta, A, Dal Bello, S, De Lorenzi, A, De Pasqual, L, Escande, D, Fassina, A, Franz, P, Gadani, G, Gaio, E, Garzotti, L, Gazza, E, Giudicotti, L, Gnesotto, F, Gobbin, M, Grando, L, Guo, S, Innocente, P, Lorenzini, R, Luchetta, A, Malesani, G, Manduchi, G, Marchiori, G, Marcuzzi, D, Marrelli, L, Martin, P, Martines, E, Masiello, A, Milani, F, Moresco, M, Murari, A, Novello, L, Ortolani, S, Paccagnella, R, Pasqualotto, R, Peruzzo, S, Piovan, R, Piovesan, P, Pizzimenti, A, Pomaro, N, Puiatti, M, Rostagni, G, Sattin, F, Scarin, P, Serianni, G, Sonato, P, Spada, E, Soppelsa, A, Spizzo, G, Spolaore, M, Taccon, C, Taliercio, C, Terranova, D, Toigo, V, Valisa, M, Vianello, N, Zaccaria, P, Zanca, P, Zaniol, B, Zanotto, L, Zilli, E, Zollino, G, and Zuin, M

Subjects
Physics, Nuclear and High Energy Physics, RFX-mod, Toroid, business.industry, Pulse duration, reversed field pinch, Plasma, Mechanics, Condensed Matter Physics, MHD control, Amplitude, Optics, Physics::Plasma Physics, RFP, Pinch, Magnetohydrodynamics, business, Voltage, Dynamo
Abstract

The modified RFX is a very flexible device used for a variety of control schemes for MHD instabilities and for advanced reverse field pinch scenarios. Relative to the previous machine, RFX-mod has a thin Cu shell with vertical field penetration time τS, lowered from 450 to 50 ms and shell/plasma proximity from b/a ≤ 1.24-1.1. Toroidal equilibrium is feedback-controlled and new power supplies provide better Bφ control. Newly designed graphite tiles protect the vessel from localized power deposition. A mesh of 192 external saddle coils, supervised by a digital feedback system, controls radial fields due to field errors and MHD modes. The paper presents an overview of the very encouraging results obtained using both new and 'standard' advanced operational modes in the current range 0.3-1 MA. A dramatic improvement of plasma performance was obtained by using the saddle coils to cancel all the radial field components, an operation mode dubbed virtual shell (VS). The toroidal voltage was lowered by more than 25% and the pulse length was tripled, up to 7 times the τS. Steady-state RFP pulses are now limited only by the applied volt-seconds. The improved magnetic boundary also has an effect on the tearing modes underlying the sustainment of the RFP, whose core amplitude is more than halved. The VS combined with new schemes for the active rotation of the MHD dynamo modes has allowed us to obtain reliable and well-controlled long RFP pulses in the MA current range. This results in a 100% increase in the particle and energy confinement time relative to the previous experiment and opens the possibility of exploring the machine performance in the 2 MA design range. © 2007 IAEA.

Published
2007
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2. High density internal transport barriers for burning plasma operation

Author

Gian Luca Ravera, B. Angelini, Maria Ester Puiatti, F. Crisanti, Fulvio Zonca, G. Apruzzese, Alessandro Bruschi, D. Pacella, G.B. Righetti, M. Leigheb, D. Frigione, S. Nowak, B. Tilia, Gregorio Vlad, F. De Marco, Francesco Mirizzi, F. P. Orsitto, G. Calabrò, S. Podda, C. Gormezano, H. Kroegler, V. Cocilovo, S V Annibaldi, A. Bertocchi, L. Pieroni, E. Lazzaro, E. Giovannozzi, R. Cesario, Alessandro Simonetto, Angelo A. Tuccillo, Francesco Romanelli, G Monari, Lorella Carraro, Gustavo Granucci, E. Barbato, D Marocco, M.L. Apicella, C. Centioli, S. Cirant, M. De Benedetti, V. Vitale, C. Castaldo, P. Buratti, L. Gabellieri, G. Mazzitelli, Basilio Esposito, L. Panaccione, V. Pericoli Ridolfini, G. Maddaluno, M. Romanelli, F. Gandini, A. Cardinali, F. Iannone, M. Marinucci, M. Panella, P. Smeulders, E. Sternini, G Regnoli, Carlo Sozzi, R. De Angelis, C. Mazzotta, and O. Tudisco

Subjects
Tokamak, Materials science, TOKAMAKS, Cyclotron, Magnetic confinement fusion, CONFINEMENT, Plasma, Electron, Condensed Matter Physics, Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin), Bootstrap current, law.invention, Nuclear Energy and Engineering, law, ITER, Plasma diagnostics, FTU, Atomic physics, Ohmic contact, CURRENT DRIVE
Abstract

A tokamak plasma with internal transport barriers (ITBs) is the best candidate for a steady ITER operation, since the high energy confinement allows working at plasma currents (Ip) lower than the reference scenario. To build and sustain an ITB at the ITER high density (>=1020 m-3) and largely dominant electron (e-) heating is not trivial in most existing tokamaks. FTU can instead meet both requests, thanks to its radiofrequency heating systems, lower hybrid (LH, up to 1.9 MW) and electron cyclotron (EC up to 1.2 MW). By the combined use of them, ITBs are obtained up to peak densities ne0 > 1.3 × 1020 m-3, with central e- temperatures Te0 ? 5.5 keV, and are sustained for as long as the heating pulse is applied (>35 confinement times, ?E). At ne0 ? 0.8 × 1020 m-3 Te0 can be larger than 11 keV. Almost full current drive (CD) and an overall good steadiness is attained within about one ?E, 20 times faster than the ohmic current relaxation time. The ITB extends over a central region with an almost flat or slightly reversed q profile and qmin ? 1.3 that is fully sustained by off-axis lower hybrid current drive. Consequent to this is the beneficial good alignment of the bootstrap current, generated by the ITB large pressure gradients, with the LH driven current. Reflectometry shows a clear change in the turbulence close to the ITB radius, consistent with the reduced e- transport. Ions (i+) are significantly heated via collisions, but thermal equilibrium with electrons cannot be attained since the e--i+ equipartition time is always 4-5 times longer than ?E. No degradation of the overall ion transport, rather a reduction of the i+ heat diffusivity, is observed inside the ITB. The global confinement has been improved up to 1.6 times over the scaling predictions. The ITB radius can be controlled by adjusting the LH power deposition profile that is affected mostly by the q value of the discharge, while the ITB strength can be varied through central EC heating. FTU experiments have shown that ITER-like e-ITBs are achievable.

Published
2005
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3. Experimental and simulated VUV spectra from the JET tokamak and the reversed field pinch RFX

Author

Maria Ester Puiatti, M. G. O'Mullane, M. Valisa, Paolo Scarin, Fabio Sattin, Lorella Carraro, K. B. Fournier, I. H. Coffey, and M. Mattioli

Subjects
Physics, Jet (fluid), atomic physics, Tokamak, Reversed field pinch, Spectrometer, Magnetic confinement fusion, Plasma, Condensed Matter Physics, Spectral line, law.invention, Nuclear Energy and Engineering, law, Ionization, Controlled thermonuclear fusion, plasma physics, impurity modelling, Atomic physics, impurities emission spectra
Abstract

Experimental VUV spectra from the JET tokamak and from the reversed field pinch RFX have been simulated. For the former device both n = 2 to n = 2 L-shell Ar and Ne spectra (respectively, in the 14.5-43.0 and in the 35.0-80.0 nm ranges) were considered, whereas for RFX only the Ne spectrum was available. The spectra have been observed with the SPRED spectrometer. From the simulation of the spectra, relative sensitivity curves have been obtained for each instrument in the ranges of the simulation. For RFX only, it has been possible to extend this curve from ~13.0 to ~105 nm, by simulating intrinsic C and O emissions. The photon emission coefficients of the lines with wavelengths in the ranges of the experimental spectra were obtained from collisional-radiative models. For Ar and Ne these coefficients have been calculated by the Hebrew University Lawrence Livermore Atomic Codes atomic physics codes, whereas for C and O the corresponding coefficients have been taken from the `Atomic Data and Analysis Structure' database. Impurity modelling is performed using a one-dimensional impurity transport code, calculating for each atomic species the radial distribution of the impurity ions. The line brightnesses are evaluated in a post-processing subroutine and the simulations of the spectra are obtained. The spectral simulations (including impurity ion transport) give confidence in the atomic physics calculations, and allow the determination of the transport coefficients in the plasma regions from which the considered ionization states emit. Finally, the obtained relative sensitivity curves of the two SPRED spectrometers have been compared with the calibrations performed by means of the branching ratio technique.

Published
2001
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4. Confinement studies on RFX

Author

Paolo Scarin, P. Zaccaria, S. Costa, P. Kusstatscher, Piero Martin, Roberto Paccagnella, Piergiorgio Sonato, Giuseppe Chitarin, Pietro Fiorentin, G. Malesani, Enrico Zilli, G. Rostagni, P. O'Leary, Lorella Carraro, S. Martini, M. Bassan, Giuseppe Zollino, Vanni Toigo, Andrea Murari, S. Vitturi, Francesco Trevisan, Maria Ester Puiatti, Andrea Stella, Gabriele Manduchi, M. Moresco, Mario Bagatin, Gianluigi Serianni, Leonardo Giudicotti, A. Buffa, Paolo Innocente, E. Spada, L. Benfatto, Giuseppe Marchiori, R. Guatieri, Emilio Martines, E. Casarotto, Elena Gaio, M. Fauri, A. Sardella, F. Bellina, H. Bergsåker, V. Schmidt, W. Baker, L. Apolloni, P. Collarin, V. Antoni, R. Piovan, M. Valisa, P. Campostrini, O. Hemming, Adriano Luchetta, Roberto Pasqualotto, N. Pomaro, Susanna Cappello, Francesco Gnesotto, Daniele Desideri, A. De Lorenzi, Massimo Guarnieri, C. Ferrer, L. Tramontin, Alvise Maschio, Antoni, V, Apolloni, L, Bagatin, M, Baker, W, Bassan, M, Bellina, F, Benfatto, I, Bergsaker, H, Buffa, A, Campostrini, P, Cappello, S, Carraro, L, Casarotto, E, Chitarin, G, Collarin, P, Costa, S, Delorenzi, A, Desideri, D, Fauri, M, Ferrer, C, Fiorentin, P, Gaio, E, Giudicotti, L, Gnesotto, F, Guarnieri, M, Guatieri, R, Hemming, O, Innocente, P, Kusstatscher, P, Luchetta, A, Malesani, G, Manduchi, G, Marchiori, G, Martin, P, Martines, E, Martini, S, Maschio, A, Moresco, M, Murari, A, Oleary, P, Paccagnella, R, Pasqualotto, R, Piovan, R, Pomaro, N, Puiatti, M, Rostagni, G, Sardella, A, Scarin, P, Schmidt, V, Serianni, G, Sonato, P, Spada, E, Stella, A, Toigo, V, Tramontin, L, Trevisan, F, Valisa, M, Vitturi, S, Zaccaria, P, Zilli, E, and Zollino, G

Subjects
Electron density, Materials science, Nuclear Energy and Engineering, Impurity, Beta (plasma physics), RFP, Ion temperature, reversed field pinch, Electron, Atomic physics, Condensed Matter Physics, RFX, Plasma current
Abstract

The results of the first year of operation of the experiment RFX are reported. Profiles of electron density, electron and ion temperature and impurity emission have been measured at plasma current I

Published
1993
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5. Joint 19th ISHW and 16th RFP workshop

Author

D. Terranova, Maria Ester Puiatti, and Boyd Blackwell

Subjects
Physics, Nuclear Energy and Engineering, business.industry, Structural engineering, Condensed Matter Physics, business, Joint (geology)
Published
2014
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6. Overview of the RFX-mod fusion science programme

Author

Piergiorgio Sonato, S. Dal Bello, Maria Ester Puiatti, Piero Martin, A. Fiorentin, Stefano Munaretto, F. Fellin, G. De Masi, M. Gobbin, Silvia Spagnolo, M. Furno Palumbo, P. Zaccaria, E. Gazza, M. Recchia, Raul Sanchez, Karsten McCollam, G. L. Trevisan, E. Spada, Alessandra Canton, Matteo Zuin, Ivo Furno, Christian Theiler, A. Zamengo, J.Q. Dong, Emilio Martines, B. E. Chapman, M. Dalla Palma, Paolo Franz, M. Brombin, V. Rigato, J. Framarin, Antonio Barbalace, P. Piovesan, Nicola Pilan, Donald A. Spong, Roberto Paccagnella, Wolf-Dieter Schneider, Barbara Zaniol, Fabio Villone, Leonardo Giudicotti, M. De Muri, T.C. Luce, R. Piovan, A. Ruzzon, V. Antoni, Giuseppe Zollino, Emanuele Sartori, Yueqiang Liu, G. Rostagni, M. Baruzzo, Manabu Takechi, Yongkyoon In, R. Delogu, Fulvio Auriemma, J. A. Alonso, M. Barp, C. Piron, D. Bonfiglio, Go Matsunaga, Enrico Zilli, G. Ciaccio, S. Martini, L. Piron, Marco Barbisan, Songfen Liu, M. Veranda, A. Scaggion, Giuseppe Chitarin, N. Pomaro, Luis Chacon, James D. Hanson, L. Apolloni, Yoichi Hirano, M. Spolaore, Francesco Gnesotto, F. Avino, Nicolò Marconato, M. Valente, Alberto Ferro, Fabio Sattin, Pierluigi Veltri, Gabriele Manduchi, L. Zanotto, C. Hidalgo, Paolo Innocente, Simona Barison, L. Novello, Italo Predebon, Rita Lorenzini, David Terranova, Luca Grando, Zhirui Wang, Vanni Toigo, M. Boldrin, M. Bigi, Adriano Luchetta, Paolo Bettini, Erik Olofsson, Andrea Rizzolo, Gianluigi Serianni, Anton Soppelsa, Cesare Taliercio, Roscoe White, C. Finotti, Susanna Cappello, N. Fonnesu, Roberto Pasqualotto, Paolo Scarin, R. Bilel, Shunsuke Ide, Alessandro Fassina, A. Maistrello, D. Carralero, Matteo Agostini, W. A. Cooper, P. Zanca, A. Buffa, Piero Agostinetti, G. Mazzitelli, X. Y. Xu, S. Fiameni, M. Moresco, John M. Finn, Lionello Marrelli, B. Momo, Tommaso Bolzonella, Nicola Vianello, Giuseppe Marchiori, D.K. Mansfield, M. Valisa, M. Okabayashi, S. C. Guo, Dominique Escande, Lorella Carraro, A. Pesce, M. Pavei, F. Ghezzi, Roberto Cavazzana, Satoru Kiyama, W. A. Gonzales, Simone Peruzzo, S.P. Hirshman, Elena Gaio, T. Barbui, Hajime Sakakita, G.L. Jackson, J. S. Sarff, Ambrogio Fasoli, D. Lopez Bruna, A. L. Roquemore, Federica Bonomo, F. Fantini, Lorenzo Frassinetti, C. Bustreo, Diego Marcuzzi, G. L. Delzanno, Gianluca Spizzo, A. De Lorenzi, 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, and Mazzitelli, G.

Subjects
Nuclear and High Energy Physics, RFX-mod, Tokamak, Strong interaction, reversed field pinch, law.invention, Magnetohydrodynamics, law, RFP, Fusion, Safety factor, Reversed field pinch, Flow transport, Settore FIS/01 - Fisica Sperimentale, Iter tokamak, Fusion power, IAEA Fusion Energy Conference, Science and Technology, Condensed Matter Physics, Active control, Plasma parameter, Plasma devices, Systems engineering, Fusion devices, Magnetic configuration, Stellarator
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. © 2013 IAEA, Vienna.

Published
2013
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7. Advances in understanding RFX-mod helical plasmas

Author

Gianluca Spizzo, Anton Soppelsa, Luca Grando, Lionello Marrelli, Tommaso Bolzonella, Alessandra Canton, Matteo Zuin, Alessandro Fassina, Fulvio Auriemma, M. Valisa, Rita Lorenzini, M. Gobbin, Paolo Scarin, A. Ruzzon, L. Zanotto, Lorella Carraro, Maria Ester Puiatti, S. Dal Bello, David Terranova, Paolo Innocente, Italo Predebon, Roberto Cavazzana, Emilio Martines, Paolo Franz, Carraro, L, Innocente, P, Auriemma, F, Cavazzana, R, Fassina, A, Franz, P, Gobbin, M, Predebon, I, Ruzzon, A, Spizzo, G, Terranova, D, Bolzonella, T, Canton, A, Dal Bello, S, Grando, L, Lorenzini, R, Marrelli, L, Martines, E, Puiatti, M, Scarin, P, Soppelsa, A, Valisa, M, Zanotto, L, and Zuin, M

Subjects
Physics, Nuclear and High Energy Physics, RFX-mod, Safety factor, Reversed field pinch, reversed field pinch, Electron, Plasma, Condensed Matter Physics, Thermal diffusivity, Helicity, TRANSPORT, Magnetic field, quasi-single helicity, REVERSED-FIELD PINCH, RFP, Electron temperature, QSH, Atomic physics
Abstract

High current (Ip = 1-1.7 MA) operations in the ohmic reversed field pinch RFX-mod spontaneously access the quasi-single helicity (QSH) regime, in which the magnetic dynamics is dominated by the innermost resonant mode (m = 1, n = -7), the magnetic chaos level is reduced and the internal magnetic field configuration is close to a pure helix. During the QSH state strong electron temperature (Te) gradients can show up, identifying an electron transport barrier (Puiatti 2011 Nucl. Fusion 51 073038). Results and advancements obtained in recent RFX-mod high current campaigns are reported in this paper. The best plasma performances at high Ip (i.e. high power) in QSH regimes have been reached with marginally reversed values of the safety factor q at the edge (-0.01 < qa < 0) when the lowest amplitudes of secondary m = 0, 1 modes are obtained. The QSH magnetic states are not stationary and show back transitions to the multiple helicity regime; however, the total persistency of the QSH is found to increase with the plasma current and at Ip > 1.5 MA it exceeds 90% of the plasma current flat-top. The high electron temperature gradients (>2 keV m-1) do not persist throughout the magnetic QSH cycle, as documented by a new high time resolution SXR double-filter multichord system, however, they last 5 to 10 ms, more than the energy confinement time. In the barrier region the profile of the electron heat diffusivity χe falls around 2-20 m2 s-1, well below ∼40-100 m-2 s-1 typical of the outer regions. The experimental evaluation of χe across the thermal barrier is consistent with a microtearing mode driven heat transport.

Published
2013
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8. Magnetohydrodynamics modelling successfully predicts new helical states in reversed-field pinch fusion plasmas.

Author

Marco Veranda, Daniele Bonfiglio, Susanna Cappello, Dominique Franck Escande, Fulvio Auriemma, Dario Borgogno, Luis Chacón, Alessandro Fassina, Paolo Franz, Marco Gobbin, Daniela Grasso, and Maria Ester Puiatti

Subjects
MAGNETOHYDRODYNAMICS, FLUID dynamics, MAGNETIC fields, HELICAL waveguides, NONLINEAR analysis
Abstract

Nonlinear fluid modelling predictions of qualitatively new self-organized helical states in the reversed-field pinch configuration are confirmed by experiments in the RFX-mod device. The new states are realized by using a seed edge magnetic field, which can impose its helical pitch to the whole plasma. In simulations, we show increased magnetic order and reduced transport of magnetic field lines in regimes with the twist of a non-resonant mode. We reveal the existence of Cantori, encompassing the region characterized by conserved magnetic surfaces, which act as barriers to transport of magnetic field lines. This opens a new research line for transport studies in hot magnetized plasmas and highlights a path towards reversed-field pinches with high confinement at high current. [ABSTRACT FROM AUTHOR]

Published
2017
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