Search

Your search keyword '"Antoni, V."' showing total 1,010 results
Start Over Author "Antoni, V."
1,010 results on '"Antoni, V."'

1. The influence of HLA genotype on the development of metal hypersensitivity following joint replacement

Author

David J. Langton, Rohan M. Bhalekar, Thomas J. Joyce, Stephen P. Rushton, Benjamin J. Wainwright, Matthew E. Nargol, Nish Shyam, Benedicte A. Lie, Moreica B. Pabbruwe, Alan J. Stewart, Susan Waller, Shonali Natu, Renne Ren, Rachelle Hornick, Rebecca Darlay, Edwin P. Su, and Antoni V. F. Nargol

Subjects
Medicine
Abstract

Plain language summary Millions of joint replacement surgeries are carried out across the world annually. In this surgery, the joint is replaced with an artificial implant. Most implants are made of cobalt chrome (CoCr). Some patients develop allergic responses to these implants, resulting in pain and tissue damage and repeat surgery. We identified patients who had developed allergies to their CoCr hip implants and compared their genes to those of patients who remained symptom-free. Having identified genes that increased the likelihood of a patient developing an allergic response, we invited additional patients to contribute samples for gene testing. Using the combined data, we used a computer algorithm to predict allergic responses based on a patient’s genes, age, and gender. The algorithm performed with sufficient accuracy to be usable in clinical practice to guide implant selection preoperatively and guide patient follow-up post-surgery.

Published
2022
Full Text
View/download PDF

4. On the road to ITER NBIs: SPIDER improvement after first operation and MITICA construction progress

Author

Toigo, V., Marcuzzi, D., Serianni, G., Boldrin, M., Chitarin, G., Bello, S. Dal, Grando, L., Luchetta, A., Pasqualotto, R., Zaccaria, P., Zanotto, L., Agnello, R., Agostinetti, P., Agostini, M., Antoni, V., Aprile, D., Barbisan, M., Battistella, M., Berton, G., Bigi, M., Brombin, M., Candeloro, V., Canton, A., Casagrande, R., Cavallini, C., Cavazzana, R., Cordaro, L., Cruz, N., Palma, M. Dalla, Dan, M., De Lorenzi, A., Delogu, R., De Muri, M., Denizeau, S., Fadone, M., Fellin, F., Ferro, A., Gaio, E., Gasparini, F., Gasparrini, C., Gnesotto, F., Jain, P., Krastev, P., Lopez-Bruna, D., Lorenzini, R., Maistrello, A., Manduchi, G., Manfrin, S., Marconato, N., Martines, E., Martini, G., Martini, S., Milazzo, R., Patton, T., Pavei, M., Peruzzo, S., Pilan, N., Pimazzoni, A., Poggi, C., Pomaro, N., Pouradier-Duteil, B., Recchia, M., Rigoni-Garola, A., Rizzolo, A., Sartori, E., Shepherd, A., Siragusa, M., Sonato, P., Sottocornola, A., Spada, E., Spagnolo, S., Spolaore, M., Taliercio, C., Terranova, D., Tinti, P., Tomsič, P., Trevisan, L., Ugoletti, M., Valente, M., Vignando, M., Zagorski, R., Zamengo, A., Zaniol, B., Zaupa, M., Zuin, M., Cavenago, M., Boilson, D., Rotti, C., Veltri, P., Decamps, H., Dremel, M., Graceffa, J., Geli, F., Urbani, M., Zacks, J., Bonicelli, T., Paolucci, F., Garbuglia, A., Agarici, G., Gomez, G., Gutierrez, D., Kouzmenko, G., Labate, C., Masiello, A., Mico, G., Moreno, J-F, Pilard, V., Rousseau, A., Simon, M., Kashiwagi, M., Tobari, H., Watanabe, K., Maejima, T., Kojima, A., Oshita, E., Yamashita, Y., Konno, S., Singh, M., Chakraborty, A., Patel, H., Singh, N.P., Fantz, U., Bonomo, F., Cristofaro, S., Heinemann, B., Kraus, W., Wimmer, C., Wünderlich, D., Fubiani, G., Tsumori, K., Croci, G., Gorini, G., McCormack, O., Muraro, A., Rebai, M., Tardocchi, M., Giacomelli, L., Rigamonti, D., Taccogna, F., Bruno, D., Rutigliano, M., D'Arienzo, M., Tonti, A., and Panin, F.

Published
2021
Full Text
View/download PDF

5. Spatiotemporal synchronization of drift waves in a magnetron sputtering plasma

Author

Martines, E., Zuin, M., Cavazzana, R., Adámek, J., Antoni, V., Serianni, G., Spolaore, M., and Vianello, N.

Subjects
Physics - Plasma Physics
Abstract

A feedforward scheme is applied for drift waves control in a magnetized magnetron sputtering plasma. A system of driven electrodes collecting electron current in a limited region of the explored plasma is used to interact with unstable drift waves. Drift waves actually appear as electrostatic modes characterized by discrete wavelengths of the order of few centimeters and frequencies of about 100 kHz. The effect of external quasi-periodic, both in time and space, travelling perturbations is studied. Particular emphasis is given to the role played by the phase relation between the natural and the imposed fluctuations. It is observed that it is possible by means of localized electrodes, collecting currents which are negligible with respect to those flowing in the plasma, to transfer energy to one single mode and to reduce that associated to the others. Due to the weakness of the external action, only partial control has been achieved., Comment: Submitted to Physics of Plasmas

Published
2014
Full Text
View/download PDF

6. SPIDER in the roadmap of the ITER neutral beams

Author

Serianni, G., Toigo, V., Bigi, M., Boldrin, M., Chitarin, G., Dal Bello, S., Grando, L., Luchetta, A., Marcuzzi, D., Pasqualotto, R., Pomaro, N., Zaccaria, P., Zanotto, L., Agostinetti, P., Agostini, M., Antoni, V., Aprile, D., Barbisan, M., Battistella, M., Brombin, M., Cavazzana, R., Dalla Palma, M., Dan, M., De Lorenzi, A., Delogu, R., De Muri, M., Denizeau, S., Fadone, M., Fellin, F., Ferbel, L., Ferro, A., Gaio, E., Gambetta, G., Gasparini, F., Gnesotto, F., Jain, P., Maistrello, A., Manduchi, G., Manfrin, S., Marchiori, G., Marconato, N., Moresco, M., Patton, T., Pavei, M., Peruzzo, S., Pilan, N., Pimazzoni, A., Piovan, R., Poggi, C., Recchia, M., Rizzolo, A., Rostagni, G., Sartori, E., Siragusa, M., Sonato, P., Spada, E., Spagnolo, S., Spolaore, M., Taliercio, C., Tinti, P., Ugoletti, M., Valente, M., Zamengo, A., Zaniol, B., Zaupa, M., Baltador, C., Cavenago, M., Boilson, D., Rotti, C., Veltri, P., Bonicelli, T., Paolucci, F., Muriel, S., Masiello, A., Chakraborty, A., Patel, H., Singh, N.P., Fantz, U., Heinemann, B., Kraus, W., Kashiwagi, M., and Tsumori, K.

Published
2019
Full Text
View/download PDF

7. Experimental experience and improvement of NIO1 H− ion source

Author

Cavenago, M., Serianni, G., Baltador, C., Barbisan, M., De Muri, M., Pimazzoni, A., Poggi, C., Veltri, P., Aprile, D., Antoni, V., Armelao, L., Baseggio, L., Candeloro, V., Cervaro, V., Franchin, L., Jain, P., Laterza, B., Maniero, M., Martini, D., Minarello, A., Pasqualotto, R., Rancan, M., Ravarotto, D., Recchia, M., Sartori, E., Sattin, M., Ugoletti, M., Variale, V., and Zucchetti, S.

Published
2019
Full Text
View/download PDF

8. Drift-Alfven vortex structures in the edge region of a fusion relevant plasma

Author

Vianello, N., Spolaore, M., Martines, E., Cavazzana, R., Serianni, G., Zuin, M., Spada, E., and Antoni, V.

Subjects
Physics - Plasma Physics
Abstract

Edge turbulent structures are commonly observed in fusion devices and are generally believed to be responsible for confinement degradation. Among their origin Drift-Alfven turbulence is one of the most commonly suggested. Drift-Alfven paradigm allows the existence of localized vortex-like structures observed also in various systems. Here we present the evidence of the presence of drift-Alfv\'en vortices in the edge region of RFX-Mod RFP device, showing how these structures are responsible for electromagnetic turbulence at the edge and its intermittent nature., Comment: 4 pages, 5 figures, Revised version submitted for publication to Physical Review Letters

Published
2009
Full Text
View/download PDF

9. Latest experimental and theoretical advances in the production of negative ions in caesium-free plasmas

Author

Taccogna, F., Bechu, S., Aanesland, A., Agostinetti, P., Agnello, R., Aleiferis, S., Angot, T., Antoni, V., Bacal, M., Barbisan, M., Bentounes, J., Bès, A., Capitelli, M., Cartry, G., Cavenago, M., Celiberto, R., Chitarin, G., Delogu, R., De Lorenzi, A., Esposito, F., Fadone, M., Ferron, N., Fubiani, G., Furno, I., Gavilan, L., Guittienne, P., Howling, A., Jacquier, R., Laricchiuta, A., Layet, J. M., Lemaire, J. L., Longo, S., Maurice, B., Minelli, P., Minissale, M., Mitrou, M., Moussaoui, R., Pimazzoni, A., Poggi, C., Rafalskyi, D., Salomon, E., Sartori, E., Sasao, M., Serianni, G., Spada, E., Suweis, S., Svarnas, P., Tahri, L., Ugoletti, M., Variale, V., and Veltri, P.

Published
2021
Full Text
View/download PDF

13. To what extent can dynamical models describe statistical features of turbulent flows?

Author

Carbone, V., Cavazzana, R., Antoni, V., Sorriso-Valvo, L., Spada, E., Regnoli, G., Giuliani, P., Vianello, N., Lepreti, F., Bruno, R., Martines, E., and Veltri, P.

Subjects
Nonlinear Sciences - Chaotic Dynamics, Nonlinear Sciences - Adaptation and Self-Organizing Systems
Abstract

Statistical features of "bursty" behaviour in charged and neutral fluid turbulence, are compared to statistics of intermittent events in a GOY shell model, and avalanches in different models of Self Organized Criticality (SOC). It is found that inter-burst times show a power law distribution for turbulent samples and for the shell model, a property which is shared only in a particular case of the running sandpile model. The breakdown of self-similarity generated by isolated events observed in the turbulent samples, is well reproduced by the shell model, while it is absent in all SOC models considered. On this base, we conclude that SOC models are not adequate to mimic fluid turbulence, while the GOY shell model constitutes a better candidate to describe the gross features of turbulence., Comment: 14 pages, 4 figures, in press on Europhys. Lett. (may 2002)

Published
2002
Full Text
View/download PDF

14. Intermittency and turbulence in a magnetically confined fusion plasma

Author

Carbone, V., Sorriso-Valvo, L., Martines, E., Antoni, V., and Veltri, P.

Subjects
Physics - Plasma Physics, Nonlinear Sciences - Chaotic Dynamics, Physics - Data Analysis, Statistics and Probability, Physics - Fluid Dynamics
Abstract

We investigate the intermittency of magnetic turbulence as measured in Reversed Field Pinch plasmas. We show that the Probability Distribution Functions of magnetic field differences are not scale invariant, that is the wings of these functions are more important at the smallest scales, a classical signature of intermittency. We show that scaling laws appear also in a region very close to the external wall of the confinement device, and we present evidences that the observed intermittency increases moving towards the wall., Comment: 5 pages

Published
2001

15. Intermittency in plasma turbulence

Author

Carbone, V., Giuliani, P., Sorriso-Valvo, L., Veltri, P., Bruno, R., Martines, E., and Antoni, V.

Subjects
Nonlinear Sciences - Chaotic Dynamics, Physics - Plasma Physics
Abstract

Intermittency in fluid turbulence can be evidentiated through the analysis of Probability Distribution Functions (PDF) of velocity fluctuations, which display a strong non-gaussian behavior at small scales. In this paper we investigate the occurrence of intermittency in plasma turbulence by studying the departure from the gaussian distribution of PDF for both velocity and magnetic fluctuations. We use data coming from two different experiments, namely in situ satellite observations of the inner solar wind and turbulent fluctuations in a magnetically confined fusion plasma. Moreover we investigate also time intermittency observed in a simplified shell model which mimics 3D MHD equations. We found that the departure from a gaussian distribution is the main characteristic of all cases. The scaling behaviour of PDFs are then investigated by using two different models built up in the past years, in order to capture the essence of intermittency in turbulence., Comment: 18 pages, with 9 figures and 2 tables

Published
2001

16. Volume and surface effects in Cs-free regimes in NIO1

Author

Cavenago, M., primary, Barbisan, M., additional, Delogu, R.S., additional, Pimazzoni, A., additional, Ugoletti, M., additional, Antoni, V., additional, Baltador, C., additional, Martini, D., additional, Poggi, C., additional, Taccogna, F., additional, Variale, V., additional, and Serianni, G., additional

Published
2023
Full Text
View/download PDF

17. A substantial step forward in the realization of the ITER HNB system: The ITER NBI Test Facility

Author

Toigo, V., Piovan, R., Dal Bello, S., Gaio, E., Luchetta, A., Pasqualotto, R., Zaccaria, P., Bigi, M., Chitarin, G., Marcuzzi, D., Pomaro, N., Serianni, G., Agostinetti, P., Agostini, M., Antoni, V., Aprile, D., Baltador, C., Barbisan, M., Battistella, M., Boldrin, M., Brombin, M., Dalla Palma, M., De Lorenzi, A., Delogu, R., De Muri, M., Fellin, F., Ferro, A., Finotti, C., Fiorentin, A., Gambetta, G., Gnesotto, F., Grando, L., Jain, P., Maistrello, A., Manduchi, G., Marconato, N., Moresco, M., Ocello, E., Pavei, M., Peruzzo, S., Pilan, N., Pimazzoni, A., Recchia, M., Rizzolo, A., Rostagni, G., Sartori, E., Siragusa, M., Sonato, P., Sottocornola, A., Spada, E., Spagnolo, S., Spolaore, M., Taliercio, C., Valente, M., Veltri, P., Zamengo, A., Zaniol, B., Zanotto, L., Zaupa, M., Boilson, D., Graceffa, J., Svensson, L., Schunke, B, Decamps, H., Urbani, M., Kushwah, M, Chareyre, J, Singh, M., Bonicelli, T., Agarici, G., Masiello, A., Paolucci, F., Simon, M., Bailly-Maitre, L, Bragulat, E., Gomez, G., Gutierrez, D., Mico, G., Moreno, J.-F., Pilard, V., Kashiwagi, M., Hanada, M., Tobari, H., Watanabe, K., Maeshima, T., Kojima, A., Umeda, N., Yamanaka, H., Chakraborty, A., Baruah, U., Rotti, C., Patel, H., Nagaraju, M.V., Singh, N.P., Patel, A., Dhola, H., Raval, B., Fantz, U., Heinemann, B., Kraus, W., Hanke, S., Hauer, V., Ochoa, S., Blatchford, P., Chuilon, B., Xue, Y., De Esch, H.P.L., Hemsworth, R., Croci, G., Gorini, G., Rebai, M., Muraro, A., Cavenago, M., D'Arienzo, M., and Sandri, S.

Published
2017
Full Text
View/download PDF

18. On the road to ITER NBIs: SPIDER improvement after first operation and MITICA construction progress

Author

Toigo, V, Marcuzzi, D, Serianni, G, Boldrin, M, Chitarin, G, Bello, S, Grando, L, Luchetta, A, Pasqualotto, R, Zaccaria, P, Zanotto, L, Agnello, R, Agostinetti, P, Agostini, M, Antoni, V, Aprile, D, Barbisan, M, Battistella, M, Berton, G, Bigi, M, Brombin, M, Candeloro, V, Canton, A, Casagrande, R, Cavallini, C, Cavazzana, R, Cordaro, L, Cruz, N, Palma, M, Dan, M, De Lorenzi, A, Delogu, R, De Muri, M, Denizeau, S, Fadone, M, Fellin, F, Ferro, A, Gaio, E, Gasparini, F, Gasparrini, C, Gnesotto, F, Jain, P, Krastev, P, Lopez-Bruna, D, Lorenzini, R, Maistrello, A, Manduchi, G, Manfrin, S, Marconato, N, Martines, E, Martini, G, Martini, S, Milazzo, R, Patton, T, Pavei, M, Peruzzo, S, Pilan, N, Pimazzoni, A, Poggi, C, Pomaro, N, Pouradier-Duteil, B, Recchia, M, Rigoni-Garola, A, Rizzolo, A, Sartori, E, Shepherd, A, Siragusa, M, Sonato, P, Sottocornola, A, Spada, E, Spagnolo, S, Spolaore, M, Taliercio, C, Terranova, D, Tinti, P, Tomsic, P, Trevisan, L, Ugoletti, M, Valente, M, Vignando, M, Zagorski, R, Zamengo, A, Zaniol, B, Zaupa, M, Zuin, M, Cavenago, M, Boilson, D, Rotti, C, Veltri, P, Decamps, H, Dremel, M, Graceffa, J, Geli, F, Urbani, M, Zacks, J, Bonicelli, T, Paolucci, F, Garbuglia, A, Agarici, G, Gomez, G, Gutierrez, D, Kouzmenko, G, Labate, C, Masiello, A, Mico, G, Moreno, J, Pilard, V, Rousseau, A, Simon, M, Kashiwagi, M, Tobari, H, Watanabe, K, Maejima, T, Kojima, A, Oshita, E, Yamashita, Y, Konno, S, Singh, M, Chakraborty, A, Patel, H, Singh, N, Fantz, U, Bonomo, F, Cristofaro, S, Heinemann, B, Kraus, W, Wimmer, C, Wunderlich, D, Fubiani, G, Tsumori, K, Croci, G, Gorini, G, Mccormack, O, Muraro, A, Rebai, M, Tardocchi, M, Giacomelli, L, Rigamonti, D, Taccogna, F, Bruno, D, Rutigliano, M, D'Arienzo, M, Tonti, A, Panin, F, Toigo V., Marcuzzi D., Serianni G., Boldrin M., Chitarin G., Bello S. D., Grando L., Luchetta A., Pasqualotto R., Zaccaria P., Zanotto L., Agnello R., Agostinetti P., Agostini M., Antoni V., Aprile D., Barbisan M., Battistella M., Berton G., Bigi M., Brombin M., Candeloro V., Canton A., Casagrande R., Cavallini C., Cavazzana R., Cordaro L., Cruz N., Palma M. D., Dan M., De Lorenzi A., Delogu R., De Muri M., Denizeau S., Fadone M., Fellin F., Ferro A., Gaio E., Gasparini F., Gasparrini C., Gnesotto F., Jain P., Krastev P., Lopez-Bruna D., Lorenzini R., Maistrello A., Manduchi G., Manfrin S., Marconato N., Martines E., Martini G., Martini S., Milazzo R., Patton T., Pavei M., Peruzzo S., Pilan N., Pimazzoni A., Poggi C., Pomaro N., Pouradier-Duteil B., Recchia M., Rigoni-Garola A., Rizzolo A., Sartori E., Shepherd A., Siragusa M., Sonato P., Sottocornola A., Spada E., Spagnolo S., Spolaore M., Taliercio C., Terranova D., Tinti P., Tomsic P., Trevisan L., Ugoletti M., Valente M., Vignando M., Zagorski R., Zamengo A., Zaniol B., Zaupa M., Zuin M., Cavenago M., Boilson D., Rotti C., Veltri P., Decamps H., Dremel M., Graceffa J., Geli F., Urbani M., Zacks J., Bonicelli T., Paolucci F., Garbuglia A., Agarici G., Gomez G., Gutierrez D., Kouzmenko G., Labate C., Masiello A., Mico G., Moreno J. -F., Pilard V., Rousseau A., Simon M., Kashiwagi M., Tobari H., Watanabe K., Maejima T., Kojima A., Oshita E., Yamashita Y., Konno S., Singh M., Chakraborty A., Patel H., Singh N. P., Fantz U., Bonomo F., Cristofaro S., Heinemann B., Kraus W., Wimmer C., Wunderlich D., Fubiani G., Tsumori K., Croci G., Gorini G., McCormack O., Muraro A., Rebai M., Tardocchi M., Giacomelli L., Rigamonti D., Taccogna F., Bruno D., Rutigliano M., D'Arienzo M., Tonti A., Panin F., Toigo, V, Marcuzzi, D, Serianni, G, Boldrin, M, Chitarin, G, Bello, S, Grando, L, Luchetta, A, Pasqualotto, R, Zaccaria, P, Zanotto, L, Agnello, R, Agostinetti, P, Agostini, M, Antoni, V, Aprile, D, Barbisan, M, Battistella, M, Berton, G, Bigi, M, Brombin, M, Candeloro, V, Canton, A, Casagrande, R, Cavallini, C, Cavazzana, R, Cordaro, L, Cruz, N, Palma, M, Dan, M, De Lorenzi, A, Delogu, R, De Muri, M, Denizeau, S, Fadone, M, Fellin, F, Ferro, A, Gaio, E, Gasparini, F, Gasparrini, C, Gnesotto, F, Jain, P, Krastev, P, Lopez-Bruna, D, Lorenzini, R, Maistrello, A, Manduchi, G, Manfrin, S, Marconato, N, Martines, E, Martini, G, Martini, S, Milazzo, R, Patton, T, Pavei, M, Peruzzo, S, Pilan, N, Pimazzoni, A, Poggi, C, Pomaro, N, Pouradier-Duteil, B, Recchia, M, Rigoni-Garola, A, Rizzolo, A, Sartori, E, Shepherd, A, Siragusa, M, Sonato, P, Sottocornola, A, Spada, E, Spagnolo, S, Spolaore, M, Taliercio, C, Terranova, D, Tinti, P, Tomsic, P, Trevisan, L, Ugoletti, M, Valente, M, Vignando, M, Zagorski, R, Zamengo, A, Zaniol, B, Zaupa, M, Zuin, M, Cavenago, M, Boilson, D, Rotti, C, Veltri, P, Decamps, H, Dremel, M, Graceffa, J, Geli, F, Urbani, M, Zacks, J, Bonicelli, T, Paolucci, F, Garbuglia, A, Agarici, G, Gomez, G, Gutierrez, D, Kouzmenko, G, Labate, C, Masiello, A, Mico, G, Moreno, J, Pilard, V, Rousseau, A, Simon, M, Kashiwagi, M, Tobari, H, Watanabe, K, Maejima, T, Kojima, A, Oshita, E, Yamashita, Y, Konno, S, Singh, M, Chakraborty, A, Patel, H, Singh, N, Fantz, U, Bonomo, F, Cristofaro, S, Heinemann, B, Kraus, W, Wimmer, C, Wunderlich, D, Fubiani, G, Tsumori, K, Croci, G, Gorini, G, Mccormack, O, Muraro, A, Rebai, M, Tardocchi, M, Giacomelli, L, Rigamonti, D, Taccogna, F, Bruno, D, Rutigliano, M, D'Arienzo, M, Tonti, A, Panin, F, Toigo V., Marcuzzi D., Serianni G., Boldrin M., Chitarin G., Bello S. D., Grando L., Luchetta A., Pasqualotto R., Zaccaria P., Zanotto L., Agnello R., Agostinetti P., Agostini M., Antoni V., Aprile D., Barbisan M., Battistella M., Berton G., Bigi M., Brombin M., Candeloro V., Canton A., Casagrande R., Cavallini C., Cavazzana R., Cordaro L., Cruz N., Palma M. D., Dan M., De Lorenzi A., Delogu R., De Muri M., Denizeau S., Fadone M., Fellin F., Ferro A., Gaio E., Gasparini F., Gasparrini C., Gnesotto F., Jain P., Krastev P., Lopez-Bruna D., Lorenzini R., Maistrello A., Manduchi G., Manfrin S., Marconato N., Martines E., Martini G., Martini S., Milazzo R., Patton T., Pavei M., Peruzzo S., Pilan N., Pimazzoni A., Poggi C., Pomaro N., Pouradier-Duteil B., Recchia M., Rigoni-Garola A., Rizzolo A., Sartori E., Shepherd A., Siragusa M., Sonato P., Sottocornola A., Spada E., Spagnolo S., Spolaore M., Taliercio C., Terranova D., Tinti P., Tomsic P., Trevisan L., Ugoletti M., Valente M., Vignando M., Zagorski R., Zamengo A., Zaniol B., Zaupa M., Zuin M., Cavenago M., Boilson D., Rotti C., Veltri P., Decamps H., Dremel M., Graceffa J., Geli F., Urbani M., Zacks J., Bonicelli T., Paolucci F., Garbuglia A., Agarici G., Gomez G., Gutierrez D., Kouzmenko G., Labate C., Masiello A., Mico G., Moreno J. -F., Pilard V., Rousseau A., Simon M., Kashiwagi M., Tobari H., Watanabe K., Maejima T., Kojima A., Oshita E., Yamashita Y., Konno S., Singh M., Chakraborty A., Patel H., Singh N. P., Fantz U., Bonomo F., Cristofaro S., Heinemann B., Kraus W., Wimmer C., Wunderlich D., Fubiani G., Tsumori K., Croci G., Gorini G., McCormack O., Muraro A., Rebai M., Tardocchi M., Giacomelli L., Rigamonti D., Taccogna F., Bruno D., Rutigliano M., D'Arienzo M., Tonti A., and Panin F.

Abstract

To reach fusion conditions and control the plasma configuration in ITER, the next step in tokamak fusion research, two neutral beam injectors (NBIs) will supply 16.5 MW each, by neutralizing accelerated negative hydrogen or deuterium ions. The requirements of ITER NBIs (40A/1 MeV D- ions for ≤1 h, 46A/870 keV H- ions for ≤1000 s) have never been simultaneously attained. So in the Neutral Beam Test Facility (NBTF, Consorzio RFX, Italy) the operation of the full-scale ITER NBI prototype (MITICA) will be tested and optimised up to full performances, focussing on accelerator (including voltage holding), beam optics, neutralisation, residual ion removal. The NBTF includes also the full-scale prototype of the ITER NBI source with 100 keV particle energy (SPIDER), for early investigation of: negative ion production and extraction, source uniformity, negative ion current density and beam optics. This paper will describe the main results of the first two years of SPIDER operation, devoted to characterizing plasma and beam parameters, including investigation of RF-plasma coupling efficiency and magnetic filter field effectiveness in reducing co-extracted electrons. SPIDER is progressing towards the first caesium injection, which aims at increasing the negative ion density. A major shutdown, planned for 2021, to solve the issues identified during the operation and to carry out programmed modifications, will be outlined. The installation of each MITICA power supply and auxiliary system is completed; in-vessel mechanical components are under procurement by Fusion for Energy (F4E). Integration, commissioning and test of the power supplies, procured by F4E and QST, as the Japanese Domestic Agency (JADA), will be presented. In particular, 1.0MV insulating tests were carried out step-by-step and successfully completed. In 2020 integrated tests of the power supplies on the accelerator dummy load started, including the assessment of their resilience to accelerator grid breakdowns usin

Published
2021

19. Effects of anabolic and catabolic nutrients on woody plant encroachment after long-term experimental fertilization in a South African savanna.

Author

Anthony J Mills, Antoni V Milewski, Dirk Snyman, and Jorrie J Jordaan

Subjects
Medicine, Science
Abstract

The causes of the worldwide problem of encroachment of woody plants into grassy vegetation are elusive. The effects of soil nutrients on competition between herbaceous and woody plants in various landscapes are particularly poorly understood. A long-term experiment of 60 plots in a South African savanna, comprising annual applications of ammonium sulphate (146-1166 kg ha-1 yr-1) and superphosphate (233-466 kg ha-1 yr-1) over three decades, and subsequent passive protection over another three decades, during which indigenous trees encroached on different plots to extremely variable degrees, provided an opportunity to investigate relationships between soil properties and woody encroachment. All topsoils were analysed for pH, acidity, EC, water-dispersible clay, Na, Mg, K, Ca, P, S, C, N, NH4, NO3, B, Mn, Cu and Zn. Applications of ammonium sulphate (AS), but not superphosphate (SP), greatly constrained tree abundance relative to control plots. Differences between control plots and plots that had received maximal AS application were particularly marked (16.3 ± 5.7 versus 1.2 ± 0.8 trees per plot). Soil properties most affected by AS applications included pH (H2O) (control to maximal AS application: 6.4 ± 0.1 to 5.1 ± 0.2), pH (KCl) (5.5 ± 0.2 to 4.0 ± 0.1), acidity (0.7 ± 0.1 to 2.6 ± 0.3 cmol kg-1), acid saturation (8 ± 2 to 40 ± 5%), Mg (386 ± 25 to 143 ± 15 mg kg-1), Ca (1022 ± 180 to 322 ± 14 mg kg-1), Mn (314 ± 11 to 118 ± 9 mg kg-1), Cu (3.6 ± 0.3 to 2.3 ± 0.2 mg kg-1) and Zn (6.6 ± 0.4 to 3.7 ± 0.4 mg kg-1). Magnesium, B, Mn and Cu were identified using principal component analysis, boundary line analysis and Kruskal-Wallis rank sum tests as the nutrients most likely to be affecting tree abundance. The ratio Mn/Cu was most related to tree abundance across the experiment, supporting the hypothesis that competition between herbaceous and woody plants depends on the availability of anabolic relative to catabolic nutrients. These findings, based on more than six decades of experimentation, may have global significance for the theoretical understanding of changes in vegetation structure and thus the practical control of invasive woody plants.

Published
2017
Full Text
View/download PDF

20. Apprenticeships, Collaboration and Scientific Discovery in Academic Field Studies

Author

Madden, Derek Scott, Grayson, Diane J., Madden, Erinn H., Milewski, Antoni V., and Snyder, Cathy Ann

Abstract

Teachers may use apprenticeships and collaboration as instructional strategies that help students to make authentic scientific discoveries as they work as amateur researchers in academic field studies. This concept was examined with 643 students, ages 14-72, who became proficient at field research through cognitive apprenticeships with the Smithsonian Institute, School for Field Studies and Earthwatch. Control student teams worked from single research goals and sets of methods, while experimental teams varied goals, methods, and collaborative activities in Kenya, Costa Rica, Panama, and Ecuador. Results from studies indicate that students who conducted local pilot studies, collaborative symposia, and ongoing, long-term fieldwork generated significantly more data than did control groups. Research reports of the experimental groups were ranked highest by experts, and contributed the most data to international science journals. Data and anecdotal information in this report indicate that structured collaboration in local long-term studies using apprenticeships may increase the potential for students' academic field studies contribution of new information to science. (Contains 2 tables.)

Published
2012
Full Text
View/download PDF

24. First operations with caesium of the negative ion source SPIDER

Author

Sartori, E., primary, Agostini, M., additional, Barbisan, M., additional, Bigi, M., additional, Boldrin, M., additional, Brombin, M., additional, Casagrande, R., additional, Dal Bello, S., additional, Dan, M., additional, Duteil, B.P., additional, Fadone, M., additional, Grando, L., additional, Maistrello, A., additional, Pavei, M., additional, Pimazzoni, A., additional, Poggi, C., additional, Rizzolo, A., additional, Shepherd, A., additional, Ugoletti, M., additional, Veltri, P., additional, Zaniol, B., additional, Agnello, R., additional, Agostinetti, P., additional, Antoni, V., additional, Aprile, D., additional, Candeloro, V., additional, Cavallini, C., additional, Cavazzana, R., additional, Cavenago, M., additional, Chitarin, G., additional, Cristofaro, S., additional, Dalla Palma, M., additional, Delogu, R., additional, De Muri, M., additional, Denizeau, S., additional, Fellin, F., additional, Ferro, A., additional, Gasparrini, C., additional, Jain, P., additional, Luchetta, A., additional, Manduchi, G., additional, Marconato, N., additional, Marcuzzi, D., additional, Mario, I., additional, Milazzo, R., additional, Pasqualotto, R., additional, Patton, T., additional, Pilan, N., additional, Recchia, M., additional, Rigoni-Garola, A., additional, Segalini, B., additional, Siragusa, M., additional, Spolaore, M., additional, Taliercio, C., additional, Toigo, V., additional, Zagorski, R., additional, Zanotto, L., additional, Zaupa, M., additional, Zuin, M., additional, and Serianni, G., additional

Published
2022
Full Text
View/download PDF

25. The H multiaperture source NIO1: gas conditioning and first cesiations

Author

Barbisan, M., primary, Cavenago, M., additional, Delogu, R. S., additional, Pimazzoni, A., additional, Poggi, C., additional, Ugoletti, M., additional, Variale, V., additional, Antoni, V., additional, Ravarotto, D., additional, Serianni, G., additional, Baltador, C., additional, Franchin, L., additional, Minarello, A., additional, Martini, D., additional, Maniero, M., additional, Rizzieri, R., additional, Romanato, L., additional, Rossetto, F., additional, and Taccogna, F., additional

Published
2022
Full Text
View/download PDF

26. Study of the Effect of Plasma-Activated Water Generated by Different Sources on Ca2+ Signalling in Arabidopsis thaliana

Author

Antoni V., Cortese E., Cappellin L., Dabalà M., Fassina A., Famengo A., Galenda A., Settimi A.G., and Navazio L.

Subjects
Plasma-Activated Water, Arabidopsis Thaliana, fungi, food and beverages
Abstract

Increasing evidence indicates that water activated by plasma discharge, termed as plasma-activated water (PAW), can promote plant growth and enhance plant defense responses. prelinimary results of the potential involvement of calcium as intracellular messenger in the transduction of PAW by plants. To study the signalling pathways activated in plants in response to PAW , Arabidopsis thaliana seedlings stably expressing the bioluminescent Ca2+ reporter aequorin were irrigated with PAW generated by different plasma torches and by a Dielectric Barrier Discarge source. In this contribution we present characteristics of the different sources as well as preliminary results on their effect on Ca2+ . In particular the dynamics of the recorded Ca2+ signals are discussed in terms of the wide range of operational conditions of the different sources, cryogenic PAW storage and its dilution.

Published
2022

32. Progress in the ITER neutral beam test facility

Author

Toigo, V, Dal Bello, S, Bigi, M, Boldrin, M, Chitarin, G, Grando, L, Luchetta, A, Marcuzzi, D, Pasqualotto, R, Pomaro, N, Serianni, G, Zaccaria, P, Zanotto, L, Agostinetti, P, Agostini, M, Antoni, V, Aprile, D, Barbisan, M, Battistella, M, Brombin, M, Cavazzana, R, Dalla Palma, M, Dan, M, Denizeau, S, De Lorenzi, A, Delogu, R, De Muri, M, Fadone, M, Fellin, F, Ferro, A, Fiorentin, A, Gaio, E, Gambetta, G, Gasparini, F, Gnesotto, F, Jain, P, Maistrello, A, Manduchi, G, Manfrin, S, Marchiori, G, Marconato, N, Moresco, M, Ocello, E, Patton, T, Pavei, M, Peruzzo, S, Pilan, N, Pimazzoni, A, Piovan, R, Poggi, C, Recchia, M, Rizzolo, A, Rostagni, G, Sartori, E, Siragusa, M, Sonato, P, Sottocornola, A, Spada, E, Spagnolo, S, Spolaore, M, Taliercio, C, Tinti, P, Ugoletti, M, Valente, M, Zamengo, A, Zaniol, B, Zaupa, M, Boilson, D, Rotti, C, Veltri, P, Chareyre, J, Decamps, H, Dremel, M, Graceffa, J, Geli, F, Schunke, B, Svensson, L, Urbani, M, Bonicelli, T, Agarici, G, Garbuglia, A, Masiello, A, Paolucci, F, Simon, M, Bailly-Maitre, L, Bragulat, E, Gomez, G, Gutierrez, D, Labate, C, Mico, G, Moreno, J, Pilard, V, Kouzmenko, G, Rousseau, A, Kashiwagi, M, Tobari, H, Watanabe, K, Maejima, T, Kojima, A, Umeda, N, Sasaki, S, Chakraborty, A, Baruah, U, Patel, H, Singh, N, Patel, A, Dhola, H, Raval, B, Gupta, V, Fantz, U, Heinemann, B, Kraus, W, Cavenago, M, Hanke, S, Ochoa, S, Blatchford, P, Chuilon, B, Xue, Y, Croci, G, Gorini, G, Muraro, A, Rebai, M, Tardocchi, M, D'Arienzo, M, Sandri, S, Tonti, A, Panin, F, Toigo V., Dal Bello S., Bigi M., Boldrin M., Chitarin G., Grando L., Luchetta A., Marcuzzi D., Pasqualotto R., Pomaro N., Serianni G., Zaccaria P., Zanotto L., Agostinetti P., Agostini M., Antoni V., Aprile D., Barbisan M., Battistella M., Brombin M., Cavazzana R., Dalla Palma M., Dan M., Denizeau S., De Lorenzi A., Delogu R., De Muri M., Fadone M., Fellin F., Ferro A., Fiorentin A., Gaio E., Gambetta G., Gasparini F., Gnesotto F., Jain P., Maistrello A., Manduchi G., Manfrin S., Marchiori G., Marconato N., Moresco M., Ocello E., Patton T., Pavei M., Peruzzo S., Pilan N., Pimazzoni A., Piovan R., Poggi C., Recchia M., Rizzolo A., Rostagni G., Sartori E., Siragusa M., Sonato P., Sottocornola A., Spada E., Spagnolo S., Spolaore M., Taliercio C., Tinti P., Ugoletti M., Valente M., Zamengo A., Zaniol B., Zaupa M., Boilson D., Rotti C., Veltri P., Chareyre J., Decamps H., Dremel M., Graceffa J., Geli F., Schunke B., Svensson L., Urbani M., Bonicelli T., Agarici G., Garbuglia A., Masiello A., Paolucci F., Simon M., Bailly-Maitre L., Bragulat E., Gomez G., Gutierrez D., Labate C., Mico G., Moreno J. F., Pilard V., Kouzmenko G., Rousseau A., Kashiwagi M., Tobari H., Watanabe K., Maejima T., Kojima A., Umeda N., Sasaki S., Chakraborty A., Baruah U., Patel H., Singh N. P., Patel A., Dhola H., Raval B., Gupta V., Fantz U., Heinemann B., Kraus W., Cavenago M., Hanke S., Ochoa S., Blatchford P., Chuilon B., Xue Y., Croci G., Gorini G., Muraro A., Rebai M., Tardocchi M., D'Arienzo M., Sandri S., Tonti A., Panin F., Toigo, V, Dal Bello, S, Bigi, M, Boldrin, M, Chitarin, G, Grando, L, Luchetta, A, Marcuzzi, D, Pasqualotto, R, Pomaro, N, Serianni, G, Zaccaria, P, Zanotto, L, Agostinetti, P, Agostini, M, Antoni, V, Aprile, D, Barbisan, M, Battistella, M, Brombin, M, Cavazzana, R, Dalla Palma, M, Dan, M, Denizeau, S, De Lorenzi, A, Delogu, R, De Muri, M, Fadone, M, Fellin, F, Ferro, A, Fiorentin, A, Gaio, E, Gambetta, G, Gasparini, F, Gnesotto, F, Jain, P, Maistrello, A, Manduchi, G, Manfrin, S, Marchiori, G, Marconato, N, Moresco, M, Ocello, E, Patton, T, Pavei, M, Peruzzo, S, Pilan, N, Pimazzoni, A, Piovan, R, Poggi, C, Recchia, M, Rizzolo, A, Rostagni, G, Sartori, E, Siragusa, M, Sonato, P, Sottocornola, A, Spada, E, Spagnolo, S, Spolaore, M, Taliercio, C, Tinti, P, Ugoletti, M, Valente, M, Zamengo, A, Zaniol, B, Zaupa, M, Boilson, D, Rotti, C, Veltri, P, Chareyre, J, Decamps, H, Dremel, M, Graceffa, J, Geli, F, Schunke, B, Svensson, L, Urbani, M, Bonicelli, T, Agarici, G, Garbuglia, A, Masiello, A, Paolucci, F, Simon, M, Bailly-Maitre, L, Bragulat, E, Gomez, G, Gutierrez, D, Labate, C, Mico, G, Moreno, J, Pilard, V, Kouzmenko, G, Rousseau, A, Kashiwagi, M, Tobari, H, Watanabe, K, Maejima, T, Kojima, A, Umeda, N, Sasaki, S, Chakraborty, A, Baruah, U, Patel, H, Singh, N, Patel, A, Dhola, H, Raval, B, Gupta, V, Fantz, U, Heinemann, B, Kraus, W, Cavenago, M, Hanke, S, Ochoa, S, Blatchford, P, Chuilon, B, Xue, Y, Croci, G, Gorini, G, Muraro, A, Rebai, M, Tardocchi, M, D'Arienzo, M, Sandri, S, Tonti, A, Panin, F, Toigo V., Dal Bello S., Bigi M., Boldrin M., Chitarin G., Grando L., Luchetta A., Marcuzzi D., Pasqualotto R., Pomaro N., Serianni G., Zaccaria P., Zanotto L., Agostinetti P., Agostini M., Antoni V., Aprile D., Barbisan M., Battistella M., Brombin M., Cavazzana R., Dalla Palma M., Dan M., Denizeau S., De Lorenzi A., Delogu R., De Muri M., Fadone M., Fellin F., Ferro A., Fiorentin A., Gaio E., Gambetta G., Gasparini F., Gnesotto F., Jain P., Maistrello A., Manduchi G., Manfrin S., Marchiori G., Marconato N., Moresco M., Ocello E., Patton T., Pavei M., Peruzzo S., Pilan N., Pimazzoni A., Piovan R., Poggi C., Recchia M., Rizzolo A., Rostagni G., Sartori E., Siragusa M., Sonato P., Sottocornola A., Spada E., Spagnolo S., Spolaore M., Taliercio C., Tinti P., Ugoletti M., Valente M., Zamengo A., Zaniol B., Zaupa M., Boilson D., Rotti C., Veltri P., Chareyre J., Decamps H., Dremel M., Graceffa J., Geli F., Schunke B., Svensson L., Urbani M., Bonicelli T., Agarici G., Garbuglia A., Masiello A., Paolucci F., Simon M., Bailly-Maitre L., Bragulat E., Gomez G., Gutierrez D., Labate C., Mico G., Moreno J. F., Pilard V., Kouzmenko G., Rousseau A., Kashiwagi M., Tobari H., Watanabe K., Maejima T., Kojima A., Umeda N., Sasaki S., Chakraborty A., Baruah U., Patel H., Singh N. P., Patel A., Dhola H., Raval B., Gupta V., Fantz U., Heinemann B., Kraus W., Cavenago M., Hanke S., Ochoa S., Blatchford P., Chuilon B., Xue Y., Croci G., Gorini G., Muraro A., Rebai M., Tardocchi M., D'Arienzo M., Sandri S., Tonti A., and Panin F.

Abstract

Heating neutral beam (HNB) injectors, necessary to achieve burning conditions and to control plasma instabilities in ITER, are characterized by such demanding parameters that a neutral beam test facility (NBTF) dedicated to their development and optimization is being realized in Padua (Italy) with direct contributions from the Italian government (through Consorzio RFX as the host entity) and the ITER international organization (with kind contributions from the ITER domestic agencies of Europe, Japan and India) and technical and scientific support from various European laboratories and universities. The NBTF hosts two experiments: SPIDER, devoted to ion source optimization for the required source performance, and MITICA, the full-size prototype of the ITER HNB, with an ion source identical to SPIDER. This paper gives an overview of the progress towards NBTF realization, with particular emphasis on issues discovered during this phase of activity and on solutions adopted to minimize the impact on the schedule and maintain the goals of the facilities. The realization of MITICA is well advanced; operation is expected to start in 2023 due to the long procurement time of the in-vessel mechanical components. The beam source power supplies, operating at 1 MV, are in an advanced phase of realization; all high-voltage components have been installed and the complex insulation test phase began in 2018. At the same time, construction and installation of SPIDER plant systems was successfully completed with their integration into the facility. The mechanical components of the SPIDER ion source were installed inside the vessel and connected to the plants. Integrated commissioning with the control, protection and safety systems ended positively and the first experimental phase has begun. The first results of the SPIDER experiment, with data from operational diagnostics, and the plans for the 1 MV insulation tests on the MITICA high-voltage components are presented.

Published
2019

33. Healthcare personnel exposure to covid-19: An observational study on quarantined positive workers

Author

Rubbi I., Pasquinelli G., Brighenti A., Fanelli M., Gualandi P., Nanni E., D'antoni V., Fabbri C., Rubbi I., Pasquinelli G., Brighenti A., Fanelli M., Gualandi P., Nanni E., D'antoni V., and Fabbri C.

Subjects
Healthcare professional, Risk factors, COVID-19 disease, Infection prevention and control measure, COVID-19 infection
Abstract

Background and aim of the study. COVID-19 is characterized by super spread events occurring in communities, e.g., hospitals. To limit virus diffusion among healthcare workers the use of personal protective equipment and screening tests are highly advised; also, isolation of virus positive professionals while moni-toring their health condition is recommended. This study aims to assess, in a cohort of COVID-19 positive quarantined healthcare workers, the perceived source of infection and exposure risk as well as the clinical evolution of the disease through a surveillance interview. Methods. A retrospective observational study ac-counting 896 observations on 93 healthcare professionals tested positive for COVID-19. Data were collected from the Nursing and Technical Directorate of Romagna, Ravenna, Local Health Company, Italy. Results. 99.5% of the positive workers accepted phone interviews with management staff. 2.6% of workers were positive with increasing records in the specialist medical area. Nurses and social health professionals were mostly affected. Patient exposure at a distance 2 hours was the first cause of positivity. In COVID-19 and territorial emergency departments, the first cause was the contact with colleagues. At the time of the infection, most of the staff wore a surgical mask. Cough, asthenia, fever, anosmia, dysgeusia, and rhinitis were common symptoms. Asymptomatic percentage was about 10%. The self-perceived physical condition was high (>7) and improved during the observation period. Conclusions. The diffusion rate of COVID-19 among healthcare workers is relatively low, probably due to the use of personal protective equip-ment. The distancing, also among colleagues, is a fundamental measure to reduce the possibility of infection. Symptoms are mild and can be controlled by surveillance measures. Constant contact with the organization is an essential strategy for promoting recovering of workers and reducing the spread of the virus within the healthcare organization. (www.actabiomedica.it).

Published
2020

36. European programme towards the 1 MeV ITER NB injector

Author

Masiello, A., Agarici, G., Bonicelli, T., Simon, M., Antoni, V., De Esch, H., De Lorenzi, A., Dremel, M., Franzen, P., Hemsworth, R., Liniers, M., Marcuzzi, D., Martin, D., Piovan, R., Simonin, A., Sonato, P., Surrey, E., Svensson, L., Tanga, A., Toigo, V., Waldon, C., and Zaccaria, P.

Published
2009
Full Text
View/download PDF

37. The ITER full size plasma source device design

Author

Sonato, P., Agostinetti, P., Anaclerio, G., Antoni, V., Barana, O., Bigi, M., Boldrin, M., Cavenago, M., Dal Bello, S., Palma, M. Dalla, Daniele, A., D’Arienzo, M., De Lorenzi, A., Ferro, A., Fiorentin, A., Gaio, E., Gazza, E., Grando, L., Fantini, F., Fellin, F., Luchetta, A., Manduchi, G., Milani, F., Marcuzzi, D., Novello, L., Pasqualotto, R., Pavei, M., Pengo, R., Peruzzo, S., Pesce, A., Pilan, N., Piovan, R., Pomaro, N., Recchia, M., Rigato, W., Rizzolo, A., Serianni, G., Spolaore, M., Spolaore, P., Sandri, S., Taliercio, C., Toigo, V., Valisa, M., Veltri, P., Zaccaria, P., Zamengo, A., and Zanotto, L.

Published
2009
Full Text
View/download PDF

41. Progress on NIO1 ion source and on energy recover tests

Author

Cavenago M., Antoni V., Baltador C., Barbisan M., Delogu R., Martini D., Minarello A., Pimazzoni A., Serianni G., Taccogna F., Ugoletti M., Valentino V., Variale V., and Veltri P.

Subjects
neutral beam injection, energy recovery, NBI, NIO1 beam source
Abstract

The important task (NBI neutral beam injector for fusion) and the complexity of radiofrequency ion source need large tests (as ELISE and SPIDER) and intermediate scale tests (as NIO1 in this poster) for optimization. Conditioning (with gas) was found necessary in Cs-free operation. Cs-based operation has begun: stability improves at lower oven temperature; in both cases, lateral view cameras show beam quality. Energy recovery plugin almost ready for NIO1 (or at a test station at TRIPS).

Published
2021

42. Progresses on NIO1 ion source and on energy recovery

Author

Cavenago M., Antoni V., Baltador C., Barbisan M., Delogu R., Martini D., Minarello A., Pimazzoni A., Poggi C., Serianni G., Taccogna F., Ugoletti M., Valentino V., Variale V., and Veltri P.

Subjects
neutral beam injection, energy recovery, NBI, NIO1 beam source
Abstract

The important task (NBI neutral beam injector for fusion) and the complexity of radiofrequency ion source need large tests (as ELISE and SPIDER) and intermediate scale tests (as NIO1 in this poster) for optimization. Conditioning (with gas) was found necessary in Cs-free operation. Cs-based operation has begun: stability improves at lower oven temperature; in both cases, lateral view cameras show beam quality. Energy recovery plugin almost ready for NIO1 (or at a test station at TRIPS).

Published
2021

43. The H- Multiaperture Source NIO1: Conditioning and First Cesiations

Author

Cavenago M., Barbisan M., Delogu R.S., Pimazzoni A., Poggi C., Ugoletti M., Variale V., Antoni V., Ravarotto D., Serianni G., Baltador C., Franchin L., Martini D., Maniero M., Minarello A., Rizzieri R., Romanato L., Rossetto F., and Taccogna F.

Subjects
NIO1, Negative Ion Optimization experiment, H- Ion Sources
Abstract

Observation of a transient, in Cs-free regime and long term NIO1 operation, led to the development of stabilization techniques, including conditioning (with oxygen or other gases, as argon, nitrogen, and xenon), interleaved with days of use of H2 as a process gas. Stabilization of transients gave more H- current and less plasma luminosity. After installation of a cesium oven, some additional increase (up to a factor of 2 reaching an average about 50 A/m2) of current was observed, but effect saturates at a moderate oven reservoir temperature. Obtained beam optics will be compared with theoretical expectation and old results in the Cs-free regime in similar conditions (as source voltage, often set to 11 kV). In both regimes, central beamlet apparent density is larger, possibly because a bias plate BP mask reduces side ones. Further improvements including long term conditioning of oven, modification of BP mask and of Cs pipe nozzle (with supporting simulations) are discussed.

Published
2021

48. Plasma characterization of a Hall effect thruster for a negative ion source concept

Author

Fadone, M, Antoni, V, Aprile, D, Chitarin, G, Fassina, A, Martines, E, Serianni, G, Sartori, E, Taccogna, F, Zuin, M, Fadone, M., Antoni, V., Aprile, D., Chitarin, G., Fassina, A., Martines, E., Serianni, G., Sartori, E., Taccogna, F., Zuin, M., Fadone, M, Antoni, V, Aprile, D, Chitarin, G, Fassina, A, Martines, E, Serianni, G, Sartori, E, Taccogna, F, Zuin, M, Fadone, M., Antoni, V., Aprile, D., Chitarin, G., Fassina, A., Martines, E., Serianni, G., Sartori, E., Taccogna, F., and Zuin, M.

Abstract

The characterization of the plasma generated by a Hall Effect thruster operating in Nitrogen and Hydrogen is presented. Measurements of the spatial profiles of the electron temperature and density of the plume have been obtained by scanning the region outside the exit plane of the thruster through a Langmuir probe. The measurements are aimed to determine the best position of a caesiated target in order to maximize the surface production of negative Hydrogen ions. The thruster has been designed as a tunable plasma source for a novel concept of a negative ion source, which could in principle benefit from some positive features of the Hall Effect thrtister; like the possibility of tuning the ion energy and the good uniformity of particle density at the channel exit, thanks to the axisymmetric magnetic field.

Published
2018

Catalog

Books, media, physical & digital resources
See catalog results