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24 results on '"CORDARO, LUIGI"'

3. The new vessel complex for the RFX-mod2 experiment: An effective synergy between fusion research and technological development

Author

Peruzzo, Simone, Aprile, Daniele, Dalla Palma, Mauro, Pavei, Mauro, Rizzetto, Dario, Rizzolo, Andrea, Abate, Domenico, Agostinetti, Piero, Agostini, Matteo, Andreani, Roberto, Anselmi, Fabrizio, Battistin, Flavio, Bernardi, Adriano, Bernardi, Marco, Berton, Giovanni, Bettini, Paolo, Bigi, Marco Angelo, Bonotto, Matteo, Brombin, Matteo, Canton, Alessandra, Carraro, Lorella, Cavazzana, Roberto, Cordaro, Luigi, Corniani, Giorgio, Dal Bello, Samuele, De Lorenzi, Antonio, De Masi, Gianluca, Degli Agostini, Fabio, Franchin, Luca, Franz, Paolo, Gambetta, Giulio, Gnesotto, Francesco, Grando, Luca, Innocente, Paolo, Laterza, Bruno, Lotto, Luca, Manfrin, Stefano, Marchiori, Giuseppe, Marconato, Nicolò, Marcuzzi, Diego, Marrelli, Lionello, Martines, Emilio, Moresco, Maurizio, Novella, Alberto, Piovan, Roberto, Pomaro, Nicola, Rossetto, Federico, Siragusa, Marco, Sonato, Piergiorgio, Spagnolo, Silvia, Spolaore, Monica, Taliercio, Cesare, Terranova, David, Tiso, Andrea, Trevisan, Lauro, Valente, Matteo, Valisa, Marco, Zaupa, Matteo, and Zuin, Matteo

Published
2023
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4. RFX-mod2 diagnostic capability enhancements for the exploration of multi-magnetic-configurations

Author

Carraro, Lorella, primary, Zuin, Matteo, additional, Abate, Domenico, additional, Agostinetti, Piero, additional, Agostini, Matteo, additional, Aprile, Daniele, additional, Barbisan, Marco, additional, Belpane, Andrea, additional, Berton, Giovanni, additional, Bonotto, Matteo, additional, Brombin, Matteo, additional, Cavazzana, Roberto, additional, Cinnirella, Luca, additional, Ciufo, Stefano, additional, Croci, Gabriele, additional, Cordaro, Luigi, additional, D'Isa, Federico, additional, Dal Bello, Samuele, additional, Dal Molin, Andrea, additional, De Masi, Gianluca, additional, Emma, Giulia, additional, Fadone, Michele, additional, Fassina, Alessandro, additional, Fiorucci, Donatella, additional, Franz, Paolo, additional, Grando, Luca, additional, Guiotto, Federico, additional, La Matina, Mirian, additional, Marchiori, Giuseppe, additional, Marconato, Nicolo, additional, Mario, Isabella, additional, Marrelli, Lionello, additional, Milazzo, Ruggero, additional, Molisani, Sara, additional, Moresco, Maurizio, additional, Muraro, Andrea, additional, Perelli Cippo, Enrico, additional, Peruzzo, Simone, additional, Porcu, Pasquale, additional, Pomaro, Nicola, additional, Puiatti, Maria Ester, additional, Putignano, Oscar, additional, Rigamonti, Davide, additional, Rigoni, Andrea, additional, Rizzolo, Andrea, additional, Ruffini, Federico, additional, Scarin, Paolo, additional, Spagnolo, Silvia, additional, Spolaore, Monica, additional, Taliercio, Cesare, additional, Tardocchi, Marco, additional, Terranova, David, additional, Ugoletti, Margherita, additional, Valisa, Marco, additional, Vianello, Nicola, additional, and Zaniol, Barbara, additional

Published
2024
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7. How does atmospheric pressure cold helium plasma affect the biomechanical behaviour on alkali-lesioned corneas?

Author

Neri, Simona, primary, Mascolini, Maria Vittoria, additional, Peruffo, Antonella, additional, Todros, Silvia, additional, Zuin, Matteo, additional, Cordaro, Luigi, additional, Martines, Emilio, additional, Contiero, Barbara, additional, Carniel, Emanuele Luigi, additional, Iacopetti, Ilaria, additional, Patruno, Marco, additional, Fontanella, Chiara Giulia, additional, and Perazzi, Anna, additional

Published
2023
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10. X-ray Micro-Discharges Fine Dynamics in a Vacuum High Voltage Experiment

Author

Spagnolo, Silvia, primary, Cordaro, Luigi, additional, Patton, Tommaso, additional, Pilan, Nicola, additional, Lorenzi, Antonio De, additional, Fontana, Cristiano L., additional, Muraro, Andrea, additional, Pino, Felix, additional, Croci, Gabriele, additional, Rigamonti, Davide, additional, Fincato, Michele, additional, Lotto, Luca, additional, Mario, Isabella, additional, Martines, Emilio, additional, Spada, Emanuele, additional, Tardocchi, Marco, additional, and Zuin, Matteo, additional

Published
2023
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11. Role of Electron Stimulated Desorption in the Initiation of Hvdc Vacuum Arc

Author

Pilan, Nicola, primary, Agostini, Matteo, additional, Caruggi, Federico, additional, Chitarin, Giuseppe, additional, Cordaro, Luigi, additional, Croci, Gabriele, additional, Deambrosis, Silvia Maria, additional, Fincato, Michele, additional, Franchin, Luca, additional, Guoitto, Federico, additional, Lotto, Luca, additional, Marconato, Nicolò, additional, Mario, Isabella, additional, Muraro, Andrea, additional, Patton, Tommaso, additional, Pino, Felix, additional, Spada, Emanuele, additional, Serianni, Gianluigi, additional, Spagnolo, Silvia, additional, and De Lorenzi, Antonio, additional

Published
2023
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14. On the Electrical and Optical Features of the Plasma Coagulation Controller Low Temperature Atmospheric Plasma Jet

Author

Cordaro, L, De Masi, G, Fassina, A, Mancini, D, Cavazzana, R, Desideri, D, Sonato, P, Zuin, M, Zaniol, B, Martines, E, Cordaro, Luigi, De Masi, Gianluca, Fassina, Alessandro, Mancini, Davide, Cavazzana, Roberto, Desideri, Daniele, Sonato, Piergiorgio, Zuin, Matteo, Zaniol, Barbara, Martines, Emilio, Cordaro, L, De Masi, G, Fassina, A, Mancini, D, Cavazzana, R, Desideri, D, Sonato, P, Zuin, M, Zaniol, B, Martines, E, Cordaro, Luigi, De Masi, Gianluca, Fassina, Alessandro, Mancini, Davide, Cavazzana, Roberto, Desideri, Daniele, Sonato, Piergiorgio, Zuin, Matteo, Zaniol, Barbara, and Martines, Emilio

Abstract

We report on the electrical and optical characterization of the Plasma Coagulation Controller (PCC) device, a low temperature atmospheric plasma source for biomedical applications. This device, designed for the study of plasma-induced blood coagulation, has been developed to operate flexibly in several operational conditions, since it is possible to vary the applied voltage Vp and the pulse repetition rate f in a quite wide range ( Vp range: 2–12 kV, f range: 1–40 kHz). Emission spectroscopy measurements were conducted by varying the line of sight along the axis of helium and neon plasma plumes. The increase of the Reactive Oxygen and Nitrogen Species (RONS) has been observed, as one moves from inside the gas pipe to the outside, as a consequence of the gas mixture with the surrounding air. Furthermore, high-speed photographs of the plasma jet were taken, showing that the plasma is not uniformly distributed in a continuous volumetric region, the plasma being concentrated in localized structures called Pulsed Atmospheric-pressure Plasma Streams (PAPS). The propagation velocities of these objects have been examined, noting that they are not related to the propagation of ion sound waves. Rather, we provide indications that the streamer propagation speed is proportional to the electron drift velocity.

Published
2019

15. Plasma-based cancer treatment: the role of intracellular RONS and hypoxia-inducible factor

Author

Zuin Matteo, Martines Emilio, Brun Paola, Artico Riccardo, Cavazzana Roberto, Cordaro Luigi, Fischetto Daniele, and Zuin Andrea

Subjects
Plasma-based cancer treatment, Plasma Medicine
Abstract

An in-vitro and ex-vivo study is presented aimed at elucidating the role or Reactive Oxygen and Nitrogen Species (RONS) in promoting a selective killing of cancer cells by cold plasma treatment. The investigation is, in particular, dedicated to the possibility of emphasizing the selectivity towards cancer cells by combining the plasma treatment with the effect of a molecule known to enhance intracellular ROS production. Lung carcinoma cell lines and cultured primary cells isolated from surgical samples of laryngeal and lung cancers as well as healthy tissue counterparts were treated with an indirect plasma source, in which a helium flow mixed with ambient air in the region between two brass grids is ionized by means of a RF voltage[1]. The helium enriched with active chemical species is then sent to the substrate to be treated. As already reported, this kind of treatment induces an increase of endogenous Reactive Oxygen Species (ROS) in eukaryotic human cells [2]. In the present study, induced ROS generation was confirmed, but a markedly higher increase was found in cancer cells than in healthy ones. The same effect was observed for intracellular nitric oxide (NO). Moreover, incubating the cells with antimycin A (AMA), a molecule known to increase ROS production [3], an amplification of the effect, both for ROS and NO, could be obtained,. The selective increase in endogenous RONS was associated to increased expression of hypoxia-inducible factor (HIF)-a, an oxygen-sensitive transcriptional activator, and to a higher apoptosis in cancer cells than of their healthy counterparts. Incubation with AMA emphasizes these effects. Overall, these results confirm the importance of the role played by RONS in plasma-based cancer treatment, and indicate that the combination with chemotherapeutic drugs could represent a useful tool to enhance the selective effect induced by the plasma treatment.

Published
2018

17. Magnetic reconnection in fusion plasmas

Author

Cordaro, Luigi and Cordaro, Luigi

Abstract

This thesis is devoted to the experimental study of magnetic reconnection and the related phenomena taking place in the plasmas produced in the RFX-mod device, a flexible toroidal facility for the study of magnetic plasma confinement for nuclear fusion. Magnetic reconnection consists in a rearrangement of the magnetic field topology, which results in a conversion of magnetic energy into heat and kinetic energy of charged particles. It occurs everywhere in the universe, being observed in the evolution of solar flares, in the interaction of solar-wind with the Earth’s magnetosphere and in star accretion disks. Magnetic reconnection occurs also in laboratory plasmas, especially in the self-organization processes in current carrying fusion plasmas. In the latter, magnetic reconnection events are particularly evident during sawtooth activities in tokamaks and in the discrete relaxation events (DREs) in Reversed Field Pinchs (RFPs). They are also involved in island formation associated to the stearing instability. During these phenomena, a topology change of the magnetic field lines occurs, leading to new equilibrium configurations of lower magnetic energy. A complete and detailed understanding of magnetic reconnection is still missing, therefore this phenomenon represents an important topic to be studied for a better understanding of a large variety of astrophysical and laboratory phenomena. The research activity, here presented, is based on the analysis of the experimental RFX-mod data, coming mainly from the in-vessel system of electrostatic and magnetic probes. The experimental analyzes have been performed alongside theoretical modelling activities. The overall activity can be divided in two main parts: in the first one, a characterization of reconnection phenomena in fusion plasmas, with special emphasis on the RFP configuration, has been performed; the second one is dedicated to the study of the rotation of magnetic islands in tokamak circular discharges. The charac

Published
2018

18. Characterization of a plasma source for biomedical applications by electrical, optical, and chemical measurements

Author

Neretti, G, Tampieri, F, Borghi, C, Brun, P, Cavazzana, R, Cordaro, L, Marotta, E, Paradisi, C, Seri, P, Taglioli, M, Zaniol, B, Zuin, M, Martines, E, Neretti, Gabriele, Tampieri, Francesco, Borghi, Carlo Angelo, Brun, Paola, Cavazzana, Roberto, Cordaro, Luigi, Marotta, Ester, Paradisi, Cristina, Seri, Paolo, Taglioli, Matteo, Zaniol, Barbara, Zuin, Matteo, Martines, Emilio, Neretti, G, Tampieri, F, Borghi, C, Brun, P, Cavazzana, R, Cordaro, L, Marotta, E, Paradisi, C, Seri, P, Taglioli, M, Zaniol, B, Zuin, M, Martines, E, Neretti, Gabriele, Tampieri, Francesco, Borghi, Carlo Angelo, Brun, Paola, Cavazzana, Roberto, Cordaro, Luigi, Marotta, Ester, Paradisi, Cristina, Seri, Paolo, Taglioli, Matteo, Zaniol, Barbara, Zuin, Matteo, and Martines, Emilio

Abstract

This paper reports the characterization of a low-power, atmospheric pressure plasma source developed for and successfully tested in applications of plasma medicine. The source produces plasma by ionizing a helium flow containing traces of air. The effluent gas is thus enriched in reactive oxygen and nitrogen species as well as helium metastable excited states. Electrical measurements, Schlieren imaging, OES and various chemical analyses and probes enabled us to fully characterize the plasma source and to determine some fundamental parameters for treating living samples such as the power feeding the discharge, the optimal source to target distance, the maximum exposure time, and to identify the major chemical species responsible for the biological action on exposed living matter.

Published
2018

19. Interaction of a low-temperature plasma with pathogens and eukaryotic cells

Author

Martines Emilio, Zuin Matteo, Brun Paola, Cavazzana Roberto, Cordaro Luigi, De Masi Gianluca, Fassina Alessandro, Fischetto Daniele, and Zuin Andrea

Subjects
Plasma cancer treatment, Plasma low-temperature medicine, Plasma corneal infections treatment, Plasma Medicine
Abstract

Plasma medicine is an emerging application of low-temperature, atmospheric pressure plasmas to the treatment of several medical conditions. These plasmas are usually produced ionizing a noble gas flow with RF or pulsed high voltage. The presence in the flow of a fraction of air, or specific gases, causes the production of reactive chemical species which interact with the substrate to which the flow is applied. Metastable states of the noble gas also contribute to the interaction, through Penning ionization. The low power used in these plasma sources ensures that the flow remains at almost ambient temperature, so that no thermal effects are induced and living tissues can be treated in a harmless way. The most straightforward application is disinfection, thanks to the effect of the reactive species on the pathogens, especially bacteria, which lack the mechanisms of defense against oxidative stress which allow survival of the eukaryotic cells composing the substrate. Further applications rely on the ability of the activation of cellular processes, such as the intracellular generation of Reactive Oxygen Species (ROS), which can lead to therapeutic effects, including accelerated wound healing and cancer cell selective killing. In this contribution we present the advances made by our group in this field, showing experimental results concerning an indirect plasma treatment performed using a plasma source patented by our group. The targeted applications are the treatment of corneal infections (keratitis) and cancer treatment.

Published
2017

20. Characterization of a plasma source for biomedical applications by electrical, optical, and chemical measurements

Author

Neretti, Gabriele, primary, Tampieri, Francesco, additional, Borghi, Carlo Angelo, additional, Brun, Paola, additional, Cavazzana, Roberto, additional, Cordaro, Luigi, additional, Marotta, Ester, additional, Paradisi, Cristina, additional, Seri, Paolo, additional, Taglioli, Matteo, additional, Zaniol, Barbara, additional, Zuin, Matteo, additional, and Martines, Emilio, additional

Published
2018
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22. 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

23. Magnetic reconnection in fusion plasmas

Author

Cordaro, Luigi

Subjects
FIS/03 Fisica della materia, RFX-mod, RFX-mod, RFP, tokamak, tearing, magnetic reconnection, FIS/01 Fisica sperimentale, Settore FIS/01 - Fisica Sperimentale, FIS/04 Fisica nucleare e subnucleare, reversed field pinch, Magnetic reconnection, RFX-mod, tokamak, RFP, reversed field pinch, tearing, current sheet, limit cycle, Settore FIS/03 - Fisica della Materia, Settore FIS/04 - Fisica Nucleare e Subnucleare, limit cycle, Physics::Plasma Physics, current sheet, Physics::Space Physics, Magnetic reconnection, RFP, tokamak, tearing
Abstract

This thesis is devoted to the experimental study of magnetic reconnection and the related phenomena taking place in the plasmas produced in the RFX-mod device, a flexible toroidal facility for the study of magnetic plasma confinement for nuclear fusion. Magnetic reconnection consists in a rearrangement of the magnetic field topology, which results in a conversion of magnetic energy into heat and kinetic energy of charged particles. It occurs everywhere in the universe, being observed in the evolution of solar flares, in the interaction of solar-wind with the Earth’s magnetosphere and in star accretion disks. Magnetic reconnection occurs also in laboratory plasmas, especially in the self-organization processes in current carrying fusion plasmas. In the latter, magnetic reconnection events are particularly evident during sawtooth activities in tokamaks and in the discrete relaxation events (DREs) in Reversed Field Pinchs (RFPs). They are also involved in island formation associated to the stearing instability. During these phenomena, a topology change of the magnetic field lines occurs, leading to new equilibrium configurations of lower magnetic energy. A complete and detailed understanding of magnetic reconnection is still missing, therefore this phenomenon represents an important topic to be studied for a better understanding of a large variety of astrophysical and laboratory phenomena. The research activity, here presented, is based on the analysis of the experimental RFX-mod data, coming mainly from the in-vessel system of electrostatic and magnetic probes. The experimental analyzes have been performed alongside theoretical modelling activities. The overall activity can be divided in two main parts: in the first one, a characterization of reconnection phenomena in fusion plasmas, with special emphasis on the RFP configuration, has been performed; the second one is dedicated to the study of the rotation of magnetic islands in tokamak circular discharges. The characterization of magnetic reconnection has been carried out by analyzing the DREs in RFP discharges. During these phenomena, a toroidally localized m = 0 magnetic perturbation develops, associated with the formation of a poloidal current sheet. The analysis, performed on the high frequency magnetic perturbation data, has shown that the current sheet is naturally subject to a fragmentation process, determining, in turn, a multiscale electric field structure, which has been suggested to be able to efficiently accelerate charged particles. Indeed, the acceleration of supra-thermal ions, mainly localized at the position where magnetic reconnection occurs, has been observed during the discrete relaxation events. Such particles have energies high enough to induce enhanced fusion reactivity, as evidenced by the time behavior of the detected neutron fluxes. These evidences show that magnetic reconnection can efficiently contribute to the plasma heating of RFP plasmas. The second main research activity has been devoted to the analysis of tearing mode dynamics in the RFX-mod plasmas in tokamak configuration. Tearing modes are resistive instabilities, developing both in tokamak and RFP plasmas. In the presence of resistivity, field lines can tear and reconnect, determining a change in the magnetic topology. The resulting magnetic configuration is characterized by the presence of magnetic islands, which, in turn, favor the radial transport of particles and the confinement reduction. Tearing modes are therefore a concern for magnetic confinement and their characterization is important in order to control them and achieve better confinement performances. The study of tokamak circular discharges has included both the analysis of experimental data and a theoretical modeling of mode rotation based on the two-fluid MHD equations. The comparison of experimental and theoretical results has shown that the rotation of magnetic islands in RFX-mod tokamak plasmas is driven mainly by the diamagnetic drift. The variation of the latter can determine the slowing down of tearing mode rotation, a phenomenon which is sometimes associated with the growth of the instability and the sudden loss of magnetic confinement (disruption). Finally, a characteristic quasi-cyclic oscillation of both amplitude and frequency of tearing mode, known as ‘limit cycle’, has been observed. This behavior has been found to be coupled to sawtooth activities occurring in the plasma core.

24. Characterization of a plasma source for biomedical applications by electrical, optical, and chemical measurements

Author

Cristina Paradisi, Roberto Cavazzana, Carlo Angelo Borghi, Emilio Martines, Paolo Seri, Matteo Taglioli, Matteo Zuin, Paola Brun, Gabriele Neretti, L. Cordaro, Ester Marotta, Barbara Zaniol, Francesco Tampieri, Neretti, Gabriele, Tampieri, Francesco, Borghi, Carlo Angelo, Brun, Paola, Cavazzana, Roberto, Cordaro, Luigi, Marotta, Ester, Paradisi, Cristina, Seri, Paolo, Taglioli, Matteo, Zaniol, Barbara, Zuin, Matteo, Martines, Emilio, Neretti, G, Tampieri, F, Borghi, C, Brun, P, Cavazzana, R, Cordaro, L, Marotta, E, Paradisi, C, Seri, P, Taglioli, M, Zaniol, B, Zuin, M, and Martines, E

Subjects
010302 applied physics, reactive oxygen species, Schlieren, reactive oxygen specie, Materials science, Polymers and Plastics, Chemical measurement, Analytical chemistry, Plasma, Condensed Matter Physic, plasma medicine, Condensed Matter Physics, 01 natural sciences, 010305 fluids & plasmas, Characterization (materials science), atmospheric plasma jet, optical emission spectroscopy, 0103 physical sciences, Optical emission spectroscopy, Plasma medicine
Abstract

This paper reports the characterization of a low-power, atmospheric pressure plasma source developed for and successfully tested in applications of plasma medicine. The source produces plasma by ionizing a helium flow containing traces of air. The effluent gas is thus enriched in reactive oxygen and nitrogen species as well as helium metastable excited states. Electrical measurements, Schlieren imaging, OES and various chemical analyses and probes enabled us to fully characterize the plasma source and to determine some fundamental parameters for treating living samples such as the power feeding the discharge, the optimal source to target distance, the maximum exposure time, and to identify the major chemical species responsible for the biological action on exposed living matter.

Published
2018

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