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36 results on '"Serafino, T."'

7. LAMQS, EDXRF and SEM analyses of old coins

Author

Torrisi, L., Mondio, G., Serafino, T., Caridi, F., Borrielli, A., Margarone, D., Giuffrida, L., Alfio Torrisi, Torrisi, L., Mondio, G., Serafino, T., Caridi, F., Borrielli, A., Margarone, D., Giuffrida, L., and Torrisi, A.

Published
2008

11. The Cantes Experiment: a Carbon Nanotubes Based Electron Gun toImprove the Performances of the Electron Cyclotron Resonance Ion Sources

Author

Odorici F, Cuffiani M, Malferrari L, Rizzoli R, Veronese GP, Gammino S, Celona L, Mascali D, Gambino N, Miracoli R, Castro G, Romano FP, Serafino T, Di Bartolo F, Guglielmotti V, Orlanducci S, Sessa V, and Terranova ML

Subjects
Physics::Plasma Physics
Abstract

The increase of electron density in ECR ion sources assures efficient ionization of very low-gas-pressure plasma. The purpose of this experiment was the creation of a carbon nanotubes based electron gun, in order to inject electrons in the plasma core and to follow how the charge state distribution and the X-ray spectra change. The use of carbon nanotubes leads to an increase of the plasma density and to a relevant reduction of the number of high energy electrons, which are detrimental for the reliability of the modern ECRIS.

Published
2010
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12. The CANTES experiment : a carbon nanotube baased electron gun to improve the performances of the electron cyclotron resonance ion sources

Author

Odorici, F, Cuffiani, M, Malferrati, L, Rizzoli, R, V. e. r. o. n. e. s. e., Gp, Giammino, S, Celona, L, Madcali, D, Gambino, R, Miracoli, R, Castro, G, Romano, Fp, Serafino, T, Di Bartolo, F, Guglielmotti, V, Orlanducci, S, Sessa, V, and TERRANOVA PERSICHELLI, Ml

Subjects
electron gun, nanocarbon materials, Settore CHIM/03 - Chimica Generale e Inorganica, field emission, nanotubes
Published
2010

15. ECR ion sources and plasmas

Author

Gammino, S., Celona, L., Mascali, D., Miracoli, R., Gambino, N., Maimone, F., Neri, L., Castro, Giuseppe, Torrisi, L., Mezzasalma, A. M., Mondio, G., Serafino, T., Andò, L., Manciagli, S., and Ciavola, G.

Published
2010

16. Enhancement of ECR performances by means of carbon nanotubes based electron guns

Author

Odorici F, Cuffiani M, Malferrari L, Rizzoli R, Veronese GP, Celona L, Gammino S, Mascali D, Miracoli R, Romano FP, Gambino N, Castro G, Ciavola G, and Serafino T

Subjects
ECR ion sources, carbon nanotubes, Physics::Plasma Physics, field emission sources, electron guns
Abstract

The CANTES experiment at INFN-LNS tested the use of carbon nanotubes (CNTs) to emit electrons by field emission effect, in order to provide additional electrons to the plasma core of an ECR ion source. This technique was used with the Caesar source, demonstrating that the total extracted ion current is increased and that a relevant reduction of the number of "high energy" electrons (above 100 keV) may be observed. The injection of additional electrons inside the plasma increases the amount of cold and warm electrons, and then the number of ionizing collisions. Details of the construction of CNTs based electron gun and of the improvement of performances of the Caesar ECR ion source will be presented.

Published
2010

26. LAMQS and XRF analyses of ancient Egyptian bronze coins

Author

Torrisi, L., primary, Caridi, F., additional, Borrielli, A., additional, Giuffrida, L., additional, Torrisi, A., additional, Mondio, G., additional, Mezzasalma, A., additional, Serafino, T., additional, Caltabiano, M., additional, Castrizio, E. D., additional, Paniz, E., additional, Romeo, M., additional, and Salici, A., additional

Published
2010
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28. LAMQS analysis applied to ancient Egyptian bronze coins

Author

Torrisi, L., primary, Caridi, F., additional, Giuffrida, L., additional, Torrisi, A., additional, Mondio, G., additional, Serafino, T., additional, Caltabiano, M., additional, Castrizio, E.D., additional, Paniz, E., additional, and Salici, A., additional

Published
2010
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30. An investigation on the formation of suprathermal electrons in a B-min ECR machine and a novel method for their damping.

Author

Mascali, D, Celona, L, Gammino, S, Castro, G, Miracoli, R, Romano, F P, Malferrari, L, Odorici, F, Rizzoli, R, Veronese, G P, and Serafino, T

Subjects
ELECTRON cyclotron resonance sources, ION sources, ELECTRON beams, PLASMA gases, CARBON nanotubes
Abstract

Electron cyclotron resonance (ECR) ion sources are largely used for production of intense beams in science and industry. Performances of modern devices are severely limited by the generation of suprathermal electrons, whose origin is still controversial. We hereby demonstrate that the electron energy distribution function is strongly influenced by the reciprocal displacement of magnetic field and plasma density profiles. The latter can be modified independently of the former, e.g. by changing the plasma anisotropic diffusion. Auxiliary electrons emitted by carbon nanotube based electron guns are used for Simon current compensation: this significantly reduces the ion losses, increases the output currents and successfully suppresses the hot electron generation. [ABSTRACT FROM AUTHOR]

Published
2013
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31. Laser and electron beams physical analyses applied to the comparison between two silver tetradrachm greek coins.

Author

Torrisi, L., Mondio, G., Mezzasalma, A. M., Margarone, D., Caridi, F., Serafino, T., and Torrisi, A.

Subjects
PLASMA lasers, SCANNING electron microscopy, ELECTRON beams, LASER ablation, ELECTRON optics
Abstract

Physical analyses by laser ablation coupled to mass quadrupole spectrometry (LAMQS), energy dispersive X-ray fluorescence (EDX) induced by electron beam, scanning electron microscopy (SEM) and surface profilometry analysis (SPA) are applied to the investigation of two silver tetradrachms from Messana, in order to compare their elemental composition and structure. Quantitative analysis of the elemental composition and of the silver isotopic ratios have been carried out analyzing the surface patina of the two samples. Significant differences in the sulfur, chlorine and copper content, in the isotopic ratios and in the morphological aspects have been measured. The obtained results are presented and discussed from the point of view of the physical techniques useful to establish the differences between apparently true and false coins. [ABSTRACT FROM AUTHOR]

Published
2010
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35. LAMQS and XRF analysis of ancient Egyptian bronze coins

Author

Alfio Torrisi, A. M. Mezzasalma, Guglielmo Mondio, T. Serafino, E. Paniz, A. Salici, Francesco Caridi, Lorenzo Giuffrida, Lorenzo Torrisi, Antonio Borrielli, M. Romeo, M. Caltabiano, E.D. Castrizio, Torrisi, L., Caridi, F., Borrielli, A., Giuffrida, L., Torrisi, A., Mondio, G., Mezzasalma, A., Serafino, T., Caltabiano, M., Castrizio, E. D., Paniz, E., Romeo, M., and Salici, A.

Subjects
Nuclear and High Energy Physics, Numismatics, Radiation, media_common.quotation_subject, Mineralogy, Art, LAMQS, engineering.material, Ancient history, Condensed Matter Physics, EDXRF, engineering, General Materials Science, Bronze, media_common
Abstract

A set of Egyptian bronze coins, dating back to the sixth or seventh century AD, has been studied by different experimental techniques in order to compare their composition and surface morphology, the process of coinage and, possibly, to also identify the place of production. The measurements have been performed by laser ablation with mass quadrupole spectrometry and energy dispersed X-ray fluorescence. Both analyses are non-invasive and can be safely used according to the integrity requirements of the analyzed pieces. Owing to the poor number of available samples, this work, more than to solve a numismatic question, has been carried out in order to test the validity of the above experimental techniques in view of further analyses on the same coins, based on better quality statistics. The preliminary results, presented in this paper, indicate significant differences in the chemistry of the coins' patina, i.e. composition and isotopic species content. This seems to support, in agreement with the archaeological expectations, the hypothesis of the existence of a local mint in Antinoopolis, never before considered in Egyptian numismatics. © 2010 Taylor & Francis.

Published
2010

36. LAMQS analysis applied to ancient Egyptian bronze coins

Author

Lorenzo Torrisi, Guglielmo Mondio, T. Serafino, Francesco Caridi, E.D. Castrizio, Lorenzo Giuffrida, E. Paniz, A. Salici, Alfio Torrisi, M. Caltabiano, Torrisi, L., Caridi, F., Giuffrida, L., Torrisi, A., Mondio, G., Serafino, T., Caltabiano, M., Castrizio, E. D., Paniz, E., and Salici, A.

Subjects
Nuclear and High Energy Physics, Laser ablation, Chemistry, X-ray Fluorescence (XRF), Nondestructive analysis, Mineralogy, engineering.material, Mass spectrometry, Alloy composition, Laser Induced Breakdown Spectroscopy (LIBS), Egyptian coin, Numismatic, stomatognathic diseases, Egyptian coins, Laser Ablation and Mass Quadrupole Spectrometry (LAMQS), Scanning Electron Microscopy (SEM), engineering, Profile analysis, Laser-induced breakdown spectroscopy, Bronze, Spectroscopy, Instrumentation
Abstract

Some Egyptian bronze coins, dated VI-VII sec A.D. are analyzed through different physical techniques in order to compare their composition and morphology and to identify their origin and the type of manufacture. The investigations have been performed by using micro-invasive analysis, such as Laser Ablation and Mass Quadrupole Spectrometry (LAMQS), X-ray Fluorescence (XRF), Laser Induced Breakdown Spectroscopy (LIBS), Electronic (SEM) and Optical Microscopy, Surface Profile Analysis (SPA) and density measurements. Results indicate that the coins have a similar bulk composition but significant differences have been evidenced due to different constituents of the patina, bulk alloy composition, isotopic ratios, density and surface morphology. The results are in agreement with the archaeological expectations, indicating that the coins have been produced in two different Egypt sites: Alexandria and Antinoupolis. A group of fake coins produced in Alexandria in the same historical period is also identified. © 2010 Elsevier B.V. All rights reserved.

Published
2010

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