The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
L Torrisi - One of the best experts on this subject based on the ideXlab platform.
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magnetic and electric deflector spectrometers for ion emission analysis from laser Generated Plasma
European Physical Journal Web of Conferences, 2018Co-Authors: L Torrisi, A Cannavo, G Ceccio, G Costa, N Restuccia, Mariapompea CutroneoAbstract:The pulsed laser-Generated Plasma in vacuum and at low and high intensities can be characterized using different physical diagnostics. The charge particles emission can be characterized using magnetic, electric and magnet-electrical spectrometers. Such on-line techniques are often based on time-of-flight (TOF) measurements. A 90° electric deflection system is employed as ion energy analyzer (IEA) acting as a filter of the mass-to-charge ratio of emitted ions towards a secondary electron multiplier. It determines the ion energy and charge state distributions. The measure of the ion and electron currents as a function of the mass-to-charge ratio can be also determined by a magnetic deflector spectrometer, using a magnetic field of the order of 0.35 T, orthogonal to the ion incident direction, and an array of little ion collectors (IC) at different angles. A Thomson parabola spectrometer, employing gaf-chromix as detector, permits to be employed for ion mass, energy and charge state recognition. Mass quadrupole spectrometry, based on radiofrequency electric field oscillations, can be employed to characterize the Plasma ion emission. Measurements performed on Plasma produced by different lasers, irradiation conditions and targets are presented and discussed. Complementary measurements, based on mass and optical spectroscopy, semiconductor detectors, fast CCD camera and Langmuir probes are also employed for the full Plasma characterization. Simulation programs, such as SRIM, SREM, and COMSOL are employed for the charge particle recognition.
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sic interdigit detectors for post accelerated ions Generated by laser Plasma
Vacuum, 2016Co-Authors: Antonella Sciuto, L Torrisi, P. Musumeci, A Cannavo, G Ceccio, M Mazzillo, L. CalcagnoAbstract:Abstract The ion streams emitted from laser Generated Plasmas and post-accelerated through a high voltage acceleration path, were monitored by solid state 4H-SiC interdigit detectors in time-of-flight configuration. The Plasmas are produced by irradiation of an aluminum target through a ns pulsed laser with 10 10 W/cm 2 intensity and 200 mJ pulse energy. Laser-Generated Plasma exhibits a mean energy of the order of 100 eV per amu. In order to enhance the ion kinetic energy a post acceleration in the range 1 kV–30 kV was employed. In this paper we studied the correlation of the acquired spectra shape with the post acceleration voltage and with the detector polarization condition. An increase in the spectra intensity was observed and studied with increasing both detector reverse bias and post acceleration voltage. Obtained results demonstrate that interdigit 4H-SiC diodes with millimetric size, show a quite good efficiency for ion detection with energy higher than 5 keV and are very promising devices allowing, thanks to their millimetric size, to carry out detectors array systems for the measurement of the spatial distribution of low energy ions Generated by pulsed laser-Plasmas.
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analysis of laser Generated Plasma ionizing radiation by synthetic single crystal diamond detectors
Applied Surface Science, 2013Co-Authors: M Marinelli, Mariapompea Cutroneo, Daniele Margarone, E. Milani, L Torrisi, G Prestopino, C Verona, G Veronarinati, A Velyha, Josef KrasaAbstract:Abstract Diamond based detectors have been used in order to analyze the ionizing radiation emitted from the laser-Generated Plasma. High energy proton/ion beams were Generated at Prague Asterix Laser System (PALS) Centre by the sub-nanosecond kJ-class laser at intensities above 10 16 W/cm 2 . The tested detectors consisted of a photoconductive device based on high quality chemical vapor deposition (CVD) single crystal diamond, produced at Rome “Tor Vergata” University. They have been operated in planar configuration, having inter-digitized electrodes. The proposed diamond detectors were able to measure UV, X-rays, electrons and ions. They have been employed in time-of-flight (TOF) configuration and their reliability was checked by comparison with standard ion collectors (mostly used at PALS). Both the forward and backward expanding Plasma was characterized in the experiment. The results indicate that diamond detectors are very promising for the characterization of fast proton and ion beams produced by high power laser systems.
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measurements of electron energy distribution in tantalum laser Generated Plasma
Journal of Applied Physics, 2010Co-Authors: L Torrisi, D Mascali, R Miracoli, S Gammino, Nadia Gambino, L Giuffrida, Daniele MargaroneAbstract:The time and space resolved characterization of laser-Generated pulsed Plasmas is useful not only for the comprehension of basic phenomena involved in the Plasma generation and following supersonic expansion, but it also permits to control the nonequilibrium process that is useful for many applications (e.g., ion implantation). The “on-line” characterization can be performed by means of Langmuir probes, ion collectors, and ion energy analyzers, in order to measure the Plasma temperatures and densities of atoms, ions, and electrons. The investigated Plasmas were Generated by means of laser pulses with intensity of the order of 109 W/cm2. The contemporary characterization of the electron (through the Langmuir probe) and ion energy distribution functions, EEDF and IEDF, respectively, permits to correlate the ion properties, like charge states and temperatures, with the electron properties, like the shape of the EEDF at different times and distances from the ablated target surface.
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single crystal silicon carbide detector of emitted ions and soft x rays from power laser Generated Plasmas
Journal of Applied Physics, 2009Co-Authors: L Torrisi, L Giuffrida, Donatella Puglisi, G Foti, J Wolowski, J Badziak, P Parys, M RosinskiAbstract:A single-crystal silicon carbide (SiC) detector was used for measurements of soft x rays, electrons, and ion emission from laser-Generated Plasma obtained with the use of the Prague Asterix Laser System (PALS) at intensities of the order of 1016 W/cm2 and pulse duration of 300 ps. Measurements were performed by varying the laser intensity and the nature of the irradiated target. The spectra obtained by using the SiC detector show not only the photopeak due to UV and soft x-ray detection, but also various peaks due to the detection of energetic charged particles. Time-of-flight technique was employed to determine the ion kinetic energy of particles emitted from the Plasma and to perform a comparison between SiC and traditional ion collectors. The detector was also employed by inserting absorber films of different thickness in front of the SiC surface in order to determine, as a first approximation, the mean energy of the soft x-ray emission from the Plasma.
L Giuffrida - One of the best experts on this subject based on the ideXlab platform.
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measurements of electron energy distribution in tantalum laser Generated Plasma
Journal of Applied Physics, 2010Co-Authors: L Torrisi, D Mascali, R Miracoli, S Gammino, Nadia Gambino, L Giuffrida, Daniele MargaroneAbstract:The time and space resolved characterization of laser-Generated pulsed Plasmas is useful not only for the comprehension of basic phenomena involved in the Plasma generation and following supersonic expansion, but it also permits to control the nonequilibrium process that is useful for many applications (e.g., ion implantation). The “on-line” characterization can be performed by means of Langmuir probes, ion collectors, and ion energy analyzers, in order to measure the Plasma temperatures and densities of atoms, ions, and electrons. The investigated Plasmas were Generated by means of laser pulses with intensity of the order of 109 W/cm2. The contemporary characterization of the electron (through the Langmuir probe) and ion energy distribution functions, EEDF and IEDF, respectively, permits to correlate the ion properties, like charge states and temperatures, with the electron properties, like the shape of the EEDF at different times and distances from the ablated target surface.
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single crystal silicon carbide detector of emitted ions and soft x rays from power laser Generated Plasmas
Journal of Applied Physics, 2009Co-Authors: L Torrisi, L Giuffrida, Donatella Puglisi, G Foti, J Wolowski, J Badziak, P Parys, M RosinskiAbstract:A single-crystal silicon carbide (SiC) detector was used for measurements of soft x rays, electrons, and ion emission from laser-Generated Plasma obtained with the use of the Prague Asterix Laser System (PALS) at intensities of the order of 1016 W/cm2 and pulse duration of 300 ps. Measurements were performed by varying the laser intensity and the nature of the irradiated target. The spectra obtained by using the SiC detector show not only the photopeak due to UV and soft x-ray detection, but also various peaks due to the detection of energetic charged particles. Time-of-flight technique was employed to determine the ion kinetic energy of particles emitted from the Plasma and to perform a comparison between SiC and traditional ion collectors. The detector was also employed by inserting absorber films of different thickness in front of the SiC surface in order to determine, as a first approximation, the mean energy of the soft x-ray emission from the Plasma.
Makoto Sekine - One of the best experts on this subject based on the ideXlab platform.
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real time in situ electron spin resonance measurements on fungal spores of penicillium digitatum during exposure of oxygen Plasmas
Applied Physics Letters, 2012Co-Authors: Kenji Ishikawa, Hiroshi Hashizume, Hiroko Mizuno, Kazuhiro Tamiya, Sachiko Iseki, Hiromasa Tanaka, Keigo Takeda, Hiroki Kondo, Takayuki Ohta, Makoto SekineAbstract:We report the kinetic analysis of free radicals on fungal spores of Penicillium digitatum interacted with atomic oxygen Generated Plasma electric discharge using real time in situ electron spin resonance (ESR) measurements. We have obtained information that the ESR signal from the spores was observed and preliminarily assignable to semiquinone radical with a g-value of around 2.004 and a line width of approximately 5G. The decay of the signal is possibly linked to the inactivation of the fungal spore. The real-time in situ ESR has proven to be a useful method to elucidate Plasma-induced surface reactions on biological specimens.
M Rosinski - One of the best experts on this subject based on the ideXlab platform.
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single crystal silicon carbide detector of emitted ions and soft x rays from power laser Generated Plasmas
Journal of Applied Physics, 2009Co-Authors: L Torrisi, L Giuffrida, Donatella Puglisi, G Foti, J Wolowski, J Badziak, P Parys, M RosinskiAbstract:A single-crystal silicon carbide (SiC) detector was used for measurements of soft x rays, electrons, and ion emission from laser-Generated Plasma obtained with the use of the Prague Asterix Laser System (PALS) at intensities of the order of 1016 W/cm2 and pulse duration of 300 ps. Measurements were performed by varying the laser intensity and the nature of the irradiated target. The spectra obtained by using the SiC detector show not only the photopeak due to UV and soft x-ray detection, but also various peaks due to the detection of energetic charged particles. Time-of-flight technique was employed to determine the ion kinetic energy of particles emitted from the Plasma and to perform a comparison between SiC and traditional ion collectors. The detector was also employed by inserting absorber films of different thickness in front of the SiC surface in order to determine, as a first approximation, the mean energy of the soft x-ray emission from the Plasma.
Donatella Puglisi - One of the best experts on this subject based on the ideXlab platform.
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Silicon carbide detector for laser-Generated Plasma radiation
Applied Surface Science, 2013Co-Authors: Giuseppe Bertuccio, Lorenzo Torrisi, Donatella Puglisi, Claudio LanzieriAbstract:We present the performance of a Silicon Carbide (SiC) detector in the acquisition of the radiation emittedby laser Generated Plasmas. The detector has been employed in time of flight (TOF) configur ...
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single crystal silicon carbide detector of emitted ions and soft x rays from power laser Generated Plasmas
Journal of Applied Physics, 2009Co-Authors: L Torrisi, L Giuffrida, Donatella Puglisi, G Foti, J Wolowski, J Badziak, P Parys, M RosinskiAbstract:A single-crystal silicon carbide (SiC) detector was used for measurements of soft x rays, electrons, and ion emission from laser-Generated Plasma obtained with the use of the Prague Asterix Laser System (PALS) at intensities of the order of 1016 W/cm2 and pulse duration of 300 ps. Measurements were performed by varying the laser intensity and the nature of the irradiated target. The spectra obtained by using the SiC detector show not only the photopeak due to UV and soft x-ray detection, but also various peaks due to the detection of energetic charged particles. Time-of-flight technique was employed to determine the ion kinetic energy of particles emitted from the Plasma and to perform a comparison between SiC and traditional ion collectors. The detector was also employed by inserting absorber films of different thickness in front of the SiC surface in order to determine, as a first approximation, the mean energy of the soft x-ray emission from the Plasma.