25 results on '"Avino, Fabio"'
Search Results
2. Implementing water recirculation in a novel portable plasma-activated water reactor enhances antimicrobial effect against Escherichia coli
- Author
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Agus, Rita, Avino, Fabio, Ibba, Lorenzo, Myers, Brayden, Zampieri, Leonardo, Martines, Emilio, Howling, Alan, and Furno, Ivo
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- 2024
- Full Text
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3. Implementing water recirculation in a novel portable plasma-activated water reactor enhances antimicrobial effect against Escherichia coli
- Author
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Agus, R, Avino, F, Ibba, L, Myers, B, Zampieri, L, Martines, E, Howling, A, Furno, I, Agus, Rita, Avino, Fabio, Ibba, Lorenzo, Myers, Brayden, Zampieri, Leonardo, Martines, Emilio, Howling, Alan, Furno, Ivo, Agus, R, Avino, F, Ibba, L, Myers, B, Zampieri, L, Martines, E, Howling, A, Furno, I, Agus, Rita, Avino, Fabio, Ibba, Lorenzo, Myers, Brayden, Zampieri, Leonardo, Martines, Emilio, Howling, Alan, and Furno, Ivo
- Abstract
The need for sustainable and reliable decontamination methods is driven by concerns regarding antibiotic resistance, as well as environmental and cost-efficiency challenges associated with traditional methods. Plasma-activated water (PAW) holds significant promise as an innovative and eco-friendly decontamination method. Nevertheless, prior to industrial implementation of PAW-based decontamination devices, a deep understanding of the bacterial inactivation mechanisms and its interplay with PAW chemical composition is required. Advancing in this field requires interdisciplinary and collaborative research using standardized practices with cost-effective and shareable PAW reactors that are still missing today. Here, to this end, a portable PAW reactor, featuring a surface dielectric barrier discharge (SDBD) that operates in air, is presented. The gaseous and aqueous phases were chemically characterized by Fourier transform infrared (FTIR) absorption spectroscopy and vis-spectrophotometry, respectively. To assess PAW antimicrobial efficacy Escherichia coli was employed as a model organism on six different PAW samples for three different treatment times. The significance of water recirculation in controlling the chemical composition of PAW, altering the nitrogen species balance in favor of NO2−, is demonstrated. This chemical modification consequently enhanced the antimicrobial effectiveness of PAW, reaching a log reduction of ∼6. Exposing E. coli to equivalent concentrations of RONS to those found in PAW attained similar log-reductions, indicating that acidified nitrites are key to PAW antimicrobial activity. Through an innovative and portable design, this study illustrates the crucial role of water recirculation in tailoring PAW composition, leading to improved decontamination capabilities and establishing a key parameter for further optimization of PAW production.
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- 2024
4. Surface DBD degradation in humid air, and a hybrid surface-volume DBD for robust plasma operation at high humidity
- Author
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Avino, Fabio, primary, Howling, Alan A, additional, Von Allmen, M., additional, Waskow, A., additional, Ibba, L., additional, Han, J., additional, and Furno, Ivo, additional
- Published
- 2023
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5. Entering the plasma agriculture field: An attempt to standardize protocols for plasma treatment of seeds
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Waskow, Alexandra, primary, Avino, Fabio, additional, Howling, Alan, additional, and Furno, Ivo, additional
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- 2021
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6. Entering the plasma agriculture field: An attempt to standardize protocols for plasma treatment of seeds
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Waskow, Alexandra, Avino, Fabio, Howling, Alan, Furno, Ivo, Waskow, Alexandra, Avino, Fabio, Howling, Alan, and Furno, Ivo
- Abstract
Plasma treatments are currently being assessed as a seed processing technology for agricultural purposes. There is sufficient information as a proof-of-concept, but a lack of standardization in the methodology prevents a convincing evaluation of plasma treatment on seeds. It would be helpful to coordinate research efforts to make the entry for newcomers into this interdisciplinary field less overwhelming and to aid in transferring this technology into the industry by establishing a common protocol. This review presents the parameters used in the seed preparation, the plasma treatment of the seed, and the seed posttreatment. This summary of the plasma and biological parameters is intended to raise awareness about questions that need to be addressed to properly record protocol details and reproduce results for the plasma treatment of seeds.
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- 2021
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7. Entering the plasma agriculture field: An attempt to standardize protocols for plasma treatment of seeds.
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Waskow, Alexandra, Avino, Fabio, Howling, Alan, and Furno, Ivo
- Subjects
- *
SEED treatment , *SEED technology , *MEDICAL protocols , *AGRICULTURAL technology , *AGRICULTURAL processing - Abstract
Plasma treatments are currently being assessed as a seed processing technology for agricultural purposes. There is sufficient information as a proof‐of‐concept, but a lack of standardization in the methodology prevents a convincing evaluation of plasma treatment on seeds. It would be helpful to coordinate research efforts to make the entry for newcomers into this interdisciplinary field less overwhelming and to aid in transferring this technology into the industry by establishing a common protocol. This review presents the parameters used in the seed preparation, the plasma treatment of the seed, and the seed posttreatment. This summary of the plasma and biological parameters is intended to raise awareness about questions that need to be addressed to properly record protocol details and reproduce results for the plasma treatment of seeds. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
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8. High Voltage Electrical Power System Architecture optimized for electrical propulsion and high power payload
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De Boissieu, Jean-Baptiste, Bouhours, Gilles, Cresp, Jean-Michel, Boulanger, Bernard, Bourgue, Olivier, Meinguet, Fabien, Bekemans, Marc, Cesaretti, Giovanni, Ghislanzoni, Luca, Inguimbert, Virginie, Taylor, Roger, Gaffinet, Ben, Furno, Ivo, Avino, Fabio, Howling, Alan, Martens, Paul, Nebuloni, Stefano, Bommottet, Daniel, Thales Alenia Space [Cannes], Thales Alenia Space, Thalès Alenia Space (Mont-sur-Marchienne, Belgique), Sitael S.p.a., ONERA / DPHY, Université de Toulouse [Toulouse], ONERA-PRES Université de Toulouse, Ionix Systems, Ecole Polytechnique Fédérale de Lausanne (EPFL), RUAG Space (Nyon, Suisse), and PRES Université de Toulouse-ONERA
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[PHYS]Physics [physics] ,HV-EPSA ,[SPI]Engineering Sciences [physics] ,HIGH POWER ,PANNEAU SOLAIRE ,ELECTRIC PROPULSION ,HALL EFFECT THRUSTER ,DIRECTDRIVE ,HIGH VOLTAGE ,SOLAR ARRAY ,SATELLITE - Abstract
International audience; There is a large design variety of power buses, with voltage levels typically ranging from 28 to 100V. This state-of-art is well adapted to past and current needs in term of power conditioning and disctribution for science and telecommunication satellites. NEvertheless, a short-term need is rising for higher operating voltages, especially for the new electric propulsion systems and high-power payloads. The currently available solutions are to add DC/DC converters inisde echa user equipement to generate all its necessary internal supply lines for the satellite primary power bus. For high power/high voltage loads, this DC/DC stage leads to power dissipation and lowers the overall efficiency of the power chain. A major step forward would be to increase the voltage directly at the level of the primary bus in order to remove some voltage conversion stages leading to lower mass, cost, volume and power dissipation. The work performed within the European Union H2020 project "HV-EPSA" was aimed to study benefits and impact of the implementation of a bus voltage from 300V to 600V, including solar array, solar array drive mechnism, power conditioning and distribution, Hall effect thruster with direct drive topology, battery and harnesses. The main problematic to solve were arcing at high voltage/low pressure (Paschen law), interaction between plasma (natural and from plasmic propulsion) and solar arrays, and distribution function using GaN mosfet. Several test campaigns were performed and the results are presented in the paper.; Il existe une grande variété de conception de bus d'alimentation, avec des niveaux de tension allant généralement de 28 à 100 V. Cet état de l'art est bien adapté aux besoins passés et actuels en termes de conditionnement et de distribution de puissance pour les satellites scientifiques et de télécommunications. Néanmoins, le besoin à court terme augmente pour des tensions de fonctionnement plus élevées, en particulier pour les nouveaux systèmes de propulsion électrique et les charges utiles à haute puissance. Les solutions actuellement disponibles consistent à ajouter des convertisseurs DC / DC à l'intérieur de chaque équipement utilisateur afin de générer toutes ses lignes d'alimentation interne nécessaires pour le bus d'alimentation primaire du satellite. Pour les charges haute puissance / haute tension, cet étage DC / DC conduit à une dissipation de puissance et diminue l'efficacité globale de la chaîne de puissance. Un grand pas en avant serait d'augmenter la tension directement au niveau du bus primaire afin de supprimer certains étages de conversion de tension conduisant à une diminution de la masse, du coût, du volume et de la dissipation de puissance. Les travaux réalisés dans le cadre du projet H2020 de l'Union européenne "HV-EPSA" visaient à étudier les avantages et l'impact de la mise en œuvre d'une tension de bus de 300V à 600V, y compris les panneaux solaires, les systèmes d'entraînement de panneaux solaires, le conditionnement et la distribution de l'énergie, le propulseur à effet Hall avec topologie à entraînement direct, batterie et cablâge. Les principaux problèmes à résoudre étaient les arcs à haute tension / basse pression (loi de Paschen), l'interaction entre le plasma (naturel et de propulsion plasmique) et les panneaux solaires, et la fonction de distribution à l'aide du mosfet GaN. Plusieurs campagnes de tests ont été réalisées et les résultats sont présentés dans l'article.
- Published
- 2019
9. New Approximations and Calibration Methods to Provide Routine Real-Time Polarimetry on JET
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Gelfusa, Michela, primary, Murari, Andrea, additional, Gaudio, Pasquale, additional, Boboc, Alexandru, additional, Mazon, Didler, additional, Avino, Fabio, additional, Lupelli, Ivan, additional, Orsitto, F. P., additional, and Tudisco, O., additional
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- 2012
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10. The validation project on the TORPEX basic plasma physics experiment
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Ricci, Paolo, Avino, Fabio, Fasoli, Ambrogio, Furno, Ivo, Jolliet, Sébastien, Halpern, Federico David, Loizu, Joaquim, Mosetto, Annamaria, and Theiler, Christian Gabriel
- Subjects
CRPP_EDGE ,TORPEX - Abstract
Owing to its detailed diagnostics, feasibility of parameter scans, and relatively simple configuration, the basic plasma physics experiment TORPEX is an ideal testbed in which to perform experiment/simulation comparisons and to contribute to the establishment of the validation methodology. Focusing on observables related to Langmuir probe measurements, we consider a number of physical quantities that can be used as observables for experiment/simulation comparison. We classify the observables according to a hierarchy that sums the number of model assumptions and measurement combinations used to obtain an observable from experimental measurements and simulation results. The more assumptions needed, the less stringent the comparison with respect to this observable and, thus, its weight in the evaluation of the agreement between experiment and simulation should be decreased. We then propose a metric to quantify the agreement between experiment and simulation, based on three logical steps. First, relative to each observable chosen to perform the comparison, we quantify the agreement between experiment and simulation. Second, the levels of agreement relative to each observable are cast into a single real number, referred to as the composite metric, with the goal of quantifying the global agreement between experiment and simulation. This process requires that each observable is weighted correctly. Third, we introduce an index that quantifies the quality of the comparison between experiment and simulation. This methodology has been used to validate two models that have been developed to simulate TORPEX turbulence: a three-dimensional two-fluid model, able to describe the global evolution of TORPEX plasma, and a reduced two-dimensional two-fluid model, able to describe only the evolution of flute modes. We show that the validation metric reveals the unsatisfactory agreement of the two-dimensional model and the experiment when non-flute modes are present in the experiment.
11. First results on the plasma fluctuations of the TORPEX device in the new magnetic field configurations
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Avino, Fabio, Bovet, Alexandre Dominique, Fasoli, Ambrogio, Furno, Ivo, Loizu, Joaquim, Mosetto, Annamaria, and Ricci, Paolo
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Physics::Plasma Physics ,TORPEX - Abstract
The TORoidal Plasma EXperiment (TORPEX) is a basic plasma physics device where a Simple Magnetized Torus configuration (SMT) can be obtained superimposing a small vertical magnetic field component on the main toroidal field, resulting in open magnetic helical field lines. This configuration reproduces some of the main features of a tokamak plasma edge, including density and magnetic field gradient and curvature. In the last years, a complete study of electrostatic fluctuations and turbulence has been completed on TORPEX, taking advantage of its high degree of plasma reproducibility and of its extended diagnostic set. To produce magnetic field configurations closer to those accessible with tokamaks, a new system has recently been implemented. This consists in a toroidal copper wire suspended inside the vacuum vessel by four vertical supports and four horizontal supports to keep fix its position. A dedicated external power supply provides a current up to 1kA that flows in the wire, generating a poloidal magnetic field. This opens the possibility of investigating plasma fluctuations in the presence of a rotational transform in either confined regions with closed magnetic flux-surfaces, or Scrape-Off Layer (SOL) regions with open field lines. A set of poloidal coils for the vertical magnetic field component permits several magnetic field configurations, from plasma limited by the vessel itself (on the high- or low-field side), to more complicated solutions of Single or Double-Null X-points, or even advanced divertor concepts, such as magnetic Snowflakes. The toroidal in-vessel copper wire system will be presented. The characterization of the main background plasma parameters in some of the new magnetic field configurations will be shown, as well as the spectral and statistical analysis of the fluctuations.
12. Basic Investigations of Electrostatic Turbulence and its Interaction with Plasma and Suprathermal Ions in a Simple Magnetized Toroidal Plasma
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Fasoli, Ambrogio, Avino, Fabio, Bovet, Alexandre, Furno, Ivo, Gustafson, Kyle, Loizu, Joaquim, Ricci, Paolo, and Theiler, Christian Gabriel
- Subjects
TORPEX
13. Study of plasma fluctuations in new closed flux-surface configurations of the TORPEX experiment
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Avino, Fabio, Fasoli, Ambrogio, Furno, Ivo, Jolliet, Sebastien, Loizu, Joaquim, Mosetto, Annamaria, and Ricci, Paolo
- Subjects
Physics::Plasma Physics ,TORPEX - Abstract
The TORoidal Plasma EXperiment (TORPEX) is a Simple Magnetized Torus (SMT) where open helical magnetic field lines are obtained from the superposition of a small vertical component on the main toroidal field. The SMT configuration features the main driving mechanisms of plasma instabilities characterising the Scrape-Off Layer (SOL) of larger tokamak devices, making TORPEX a very attractive machine to perform fusion oriented studies of plasma turbulence. A new experimental set-up has been recently developed to generate a poloidal magnetic field. It consists in a toroidal copper wire suspended in the middle of the vacuum vessel by seven 1mm stainless steel wires, three vertical and four lateral, plus the vertical electrical coaxial feed-through. A current up to 1kA can be driven in the system, giving us the possibility to include a rotational transform and to deal with a SOL much closer to the one of a fusion device. Moreover plasma core and closed-to-open field line region studies could be performed. The technical details of the set-up will be given together with the experimental results obtained during the first campaigns with Hydrogen plasmas. A magnetic configuration with almost closed flux surfaces has been chosen, resulting from the poloidal magnetic field together with a small vertical component. The radial profiles of the main plasma parameters will be presented, such as plasma density n_e, plasma temperature T_e and plasma potential V_pl. The spectral properties of plasma dominant coherent modes at the position of maxima fluctuations will be provided too, including power spectral density estimates and measurements of vertical and toroidal wave-numbers obtained for different values of poloidal magnetic field. This allows us to calculate the poloidal and toroidal mode-numbers which can be used together with fluid simulations to asses the kind of instability we are dealing with. An overview of the new accessible magnetic field configurations will be showed as well, ranging from Single Null X-points to magnetic Snowflakes.
14. Plasma turbulence studies in TORPEX basic plasma pyhsics device: from concentric flux surfaces to single null X-points
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Avino, Fabio, Bovet, Alexandre Dominique, Fasoli, Ambrogio, Furno, Ivo, and Ricci, Paolo
- Subjects
Physics::Plasma Physics ,TORPEX - Abstract
TORPEX is a basic plasma physics device where a simple magnetized torus (SMT) is produced by adding a small vertical magnetic field to a main toroidal component, generating helical field lines. The SMT configuration features the main ingredients of a tokamak Scrape-Off Layer (SOL), namely density gradients in the presence of magnetic field curvature and gradient. Recently, a toroidal in-vessel copper conductor has been installed in the TORPEX device. A current up to 1kA can be driven in the toroidal conductor. This produces a poloidal magnetic field, which closes the field lines together with the toroidal field, resulting in a monotonic safety factor profile from 1 to 12 along the radial direction with an almost constant magnetic shear of 2. Several magnetic field geometries are accessible using the vertical field coils, from wall-limited plasmas with a SOL on the high-field side or low-field side, to single or double-null X-points as well as magnetic snowflakes. This way, more fusion relevant configurations of increasing complexity are achieved, while maintaining plasma parameters in ranges that allow a complete spatio-temporal diagnostic coverage across the plasma cross-section. Magnetic configurations with almost circular and concentric flux surfaces are considered for the analysis of plasma coherent structures. Quasi-coherent modes with a strong poloidal asymmetry are measured. A dominant localization on the bad-curvature region of the plasma volume (low field side) suggests a ballooning nature for these instabilities. A spectral characterization at the position of maximum fluctuation amplitudes is performed, including measurements of the power spectral density, indicating mode frequencies in the range 15-30 kHz. Measurements of vertical and toroidal correlations for several values of the poloidal magnetic field have been performed, allowing us to calculate the poloidal and toroidal mode-numbers. Field aligned modes with a toroidal mode number n=1 are identified. This is being compared with the numerical results obtained with the linear version of the Global Braginskii Solver (GBS) to assess the nature of the observed dominant instabilities. Initial measurements of plasma turbulence in TORPEX plasmas with a single null Xpoint will also be discussed, including analysis of the blob dynamics in this configuration performed using imaging techniques and conditional average sampling.
15. Verification & Validation: application to the TORPEX basic plasma physics experiment
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Ricci, Paolo, Avino, Fabio, Bovet, Alexandre, Fasoli, Ambrogio, Furno, Ivo, Jolliet, Sébastien, Halpern, Federico David, Loizu, Joaquim, Mosetto, Annamaria, Riva, Fabio, Theiler, Christian, and Wersal, Christoph
- Subjects
CRPP_EDGE ,TORPEX
16. First fluctuation measurements in the new confined plasma configuration of the TORPEX device
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Avino, Fabio, Bovet, Alexandre Dominique, Fasoli, Ambrogio, Furno, Ivo, Loizu, Jaquim, Mosetto, Annamaria, and Ricci, Paolo
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Physics::Plasma Physics ,TORPEX - Abstract
The basic plasma physics device TORPEX features some of the main ingredients of the Scrape-Off Layer (SOL) of fusion devices, including gradients of density and magnetic field, as well as magnetic field curvature. A simple magnetized torus configuration (SMT) is produced using a small vertical magnetic field component superimposed to the main toroidal field, resulting in helical open magnetic field lines. A comprehensive study of electrostatic instabilities and turbulence in TORPEX plasmas has been performed in the last years. A new experimental set-up has been recently implemented on the TORPEX device to produce a poloidal magnetic field and a rotational transform. This set-up is based on an in-vessel toroidal copper wire of 1 cm of radius, suspended in the middle of the vacuum vessel of TORPEX by several horizontal and vertical supports. These supports can also be used to position the current carrying wire at different vertical positions up to the top of the chamber to recover the original SMT configuration. The wire is powered by an external power supply providing a maximum current of 1 kA during a flat-top of about 0.5s. A 0.2s dynamics for the ramp-up and the ramp-down phases is given by the power supply temporal response. The current flowing in the toroidal wire generates a poloidal magnetic field that leads to a rotational transform. In the resulting magnetic field lines configuration the characterization of the plasma turbulence and instabilities can be performed on both the core region of closed flux-surfaces and the SOL region of open field lines. A proper value of the vertical magnetic field is used to precisely define the geometry of closed/open field lines, with the vessel walls acting as a limiter. An overview of the new experimental set-up will be presented, together with the background plasma parameters and profile. We will discuss the first measurements of plasma fluctuations in the SOL and their spatio-temporal evolution. The more advanced magnetic configurations that are accessible with this new experimental set-up will also be presented.
17. Turbulence at the boundary of toroidal plasmas with open and closed magnetic flux surfaces
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Avino, Fabio, Fasoli, Ambrogio, and Furno, Ivo
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electrostatic fluctuations ,Physics::Plasma Physics ,plasma physics ,plasma turbulence ,magnetic confinement ,ballooning modes ,Langmuir probes ,diverted plasmas ,TORPEX ,nuclear fusion ,concentric magnetic flux surfaces - Abstract
The control and confinement of fusion plasmas are currently limited by a lack of understanding of the physical mechanisms behind the evolution of the turbulent transport experienced by particles and energy. In-situ investigations of plasma turbulence in fusion experiments is strongly hampered by the high temperatures and densities. Basic plasma physics devices represent an alternative solution to perform turbulence studies with the possibility of rigorously validating numerical codes. One of these experiments is TORPEX, in which a comprehensive characterization of plasma turbulence has been conducted in the presence of open helical magnetic field lines in toroidal geometry. These reproduce the main features of the scrape-off layer (SOL), which is the open flux surface region at the edge of magnetically confined fusion plasmas. The SOL has a key role in the balance of the dynamics that determine the overall plasma confinement. The first achievement of this thesis work is a technical upgrade of TORPEX that consists in the installation of a copper toroidal conductor inside the TORPEX vacuum vessel. A poloidal magnetic field is produced by a current flowing inside the conductor, introducing a rotational transform. This allows studying plasma turbulence in magnetic geometries of increasing complexity, starting with the simplest configuration of quasi-concentric flux surfaces. The initial exploration of the main plasma properties, including plasma production mechanisms and particle confinement time, is followed by a detailed spectral characterization of the measured electrostatic quasi-coherent fluctuations. Measurements of the toroidal and poloidal mode numbers reveal field-aligned modes. These present a poloidal localization indicating a clear ballooning feature that is in agreement with the results of a linear fluid code. The first experimental measurements of plasma blobs in the presence of a single-null X-point are performed. Blobs radially propagating outwards across the X-point are conditionally sampled, which allows us to track and analyze in detail the corresponding dynamics. The ExB drifts induced by the background potential gradients and the fluctuating potential dipole are both responsible for the measured blob acceleration in the X-point region. The contribution of the potential dipole is explained on the basis of an analytical model, in which the variation of the magnetic field intensity close to the X-point plays a key role. This results in a blob speed scaling that is in good agreement with the measured values.
18. A comprehensive study of electrostatic turbulence and transport in the laboratory basic plasma physics device TORPEX
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Furno, Ivo, Fasoli, Ambrogio, Avino, Fabio, Bovet, Alexandre, Gustafson, Kyle, Iraji, Davoud, Labit, Benoît, Loizu, Joaquim, Ricci, Paolo, and Theiler, Christian Gabriel
- Subjects
Physics::Plasma Physics ,Physics::Space Physics ,TORPEX - Abstract
TORPEX is a toroidal device located at the CRPP-EPFL in Lausanne. In TORPEX, a vertical magnetic field superposed on a toroidal field creates helicoidal field lines with both ends terminating on the torus vessel. The turbulence driven by magnetic curvature and plasma gradients causes plasma transport in the radial direction while at the same time plasma is progressively lost along the field lines. The relatively simple magnetic geometry and diagnostic access of the TORPEX configuration facilitate the experimental study of low frequency instabilities and related turbulent transport, and make an accurate comparison between simulations and experiments possible. We first present a detailed investigation of electrostatic interchange turbulence, associated structures and their effect on plasma using high-resolution diagnostics of plasma parameters and wave fields throughout the whole device cross-section, fluid models and numerical simulations. Interchange modes nonlinearly develop blobs, radially propagating filaments of enhanced plasma pressure. Blob velocities and sizes are obtained from probe measurements using pattern recognition and are described by an analytical expression that includes ion polarization currents, parallel sheath currents and ion-neutral collisions. Then, we describe recent advances of a non-perturbative Li 6+ miniaturized ion source and a detector for the investigation of the interaction between supra thermal ions and interchange–driven turbulence. We present first measurements of the spatial and energy space distribution of the fast ion beam in different plasma scenarios, in which the plasma turbulence is fully characterized. The experiments are interpreted using two-dimensional fluid simulations describing the low-frequency interchange turbulence, taking into account the plasma source and plasma losses at the torus vessel. By treating fast ions as test particles, we integrate their equations of motion in the simulated electromagnetic fields, and we compare their time-averaged and statistical properties with experimental data. Finally, we discuss future developments including the possibility of closing the magnetic field lines and of performing magnetic reconnection experiments.
19. Dual Langmuir-probe array for 3D plasma studies in TORPEX
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Baquero-Ruiz, M., Avino, Fabio, Chellai, Oulfa, Fasoli, Ambrogio, Furno, Ivo, Jacquier, Rémy, Manke, Fabian, Patrick, Sam, and Baquero Ruiz, Marcelo
- Abstract
We have designed and installed a new Langmuir-probe (LP) array diagnostic to determine basic three-dimensional (3D) features of plasmas in TORPEX. The diagnostic consists of two identical LP arrays, placed on opposite sides of the apparatus, which provide comprehensive coverage of the poloidal cross section at the two different toroidal locations. Cross correlation studies of signals from the arrays provide a basic way to extract 3D information from the plasmas, as experiments show. Moreover, the remarkable signal-to-noise performance of the front-end electronics allows us to follow a different approach in which we combine information from all probes in both arrays to reconstruct elementary 3D plasma structures at each acquisition time step. Then, through data analysis, we track the structures as they evolve in time. The LP arrays include a linear-motion mechanism that can displace radially the probes located on the low field side for experiments that require fine-tuning of the probe locations, and for operational compatibility with the recently installed in-vessel toroidal conductor.
20. Non-diffusive suprathermal ion transport associated with blobs in TORPEX plasmas
- Author
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Bovet, Alexandre Dominique, Avino, Fabio, Fasoli, Ambrogio, Furno, Ivo, Gustafson, Kyle, and Ricci, Paolo
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Physics::Plasma Physics - Abstract
We present unprecedented space and time-resolved measurements of the transport of a suprathermal ion beam injected in the toroidal device TORPEX. Experiments are performed in turbulence dominated by an ideal-interchange mode using a Li6+ ion source and a set of energy analyzers. Depending on the suprathermal ion energy, the transport exhibits subdiffusive or superdiffusive behaviors. The fast ion current fluctuations are quasi-Gaussian in the former regime and strongly intermittent in the latter. In the superdiffusive case, using conditional sampling, we show that the transport is associated with intermittent field-aligned blobs. In the subdiffusive case, supra-thermal ions average the turbulent structures during their gyro-motion and their vertical drift. These results complement our investigations of the supra-thermal ion transport using 3D time-averaged measurements, which are in agreement with numerical simulations. Numerical modeling is performed by computing the trajectories of tracers in a turbulent electrostatic field generated by a 2D global fluid model. Gyro- and drift-averaging reduce the transport. The evolution of the radial distribution of fast ions can be modeled by a fractional diffusion equation describing fractional Lévy motion.
21. Transport regimes for fast ions in TORPEX toroidal magnetized plasmas
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Furno, Ivo, Avino, Fabio, Bovet, Alexandre, Fasoli, Ambrogio, Ricci, Paolo, and Gustafson, Kyle
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TORPEX
22. Experimental and numerical studies of suprathermal ion transport
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Bovet, Alexandre, Avino, Fabio, Fasoli, Ambrogio, Furno, Ivo, Gustafson, Kyle, Loizu, Joaquim, and Ricci, Paolo
- Subjects
transport ,nondiffusive ,fast ions ,plasmas ,surpathermal ions
23. Review and perspectives of electrostatic turbulence and transport studies in the basic plasma physics device TORPEX
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Avino, Fabio, Bovet, Alexandre, Fasoli, Ambrogio, Furno, Ivo, Gustafson, Kyle, Loizu, Joaquim, Ricci, Paolo, and Theiler, Christian Gabriel
- Subjects
Physics::Plasma Physics ,TORPEX - Abstract
TORPEX is a basic plasma physics toroidal device located at the CRPP-EPFL in Lausanne. In TORPEX, a vertical magnetic field superposed on a toroidal field creates helicoidal field lines with both ends terminating on the torus vessel. We review recent advances in the understanding and control of electrostatic interchange turbulence, associated structures and their effect on suprathermal ions. These advances are obtained using high-resolution diagnostics of plasma parameters and wave fields throughout the whole device cross-section, fluid models and numerical simulations. Furthermore, we discuss future developments including the possibility of generating closed field line configurations with rotational transform using an internal toroidal wire carrying a current. This system will also allow the study of innovative fusion-relevant configurations, such as the snowflake divertor.
24. Giustizia penale e carcere: l’immobilismo dell’emergenza
- Author
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gaia tessitore, Fulvia Abbondante, Sara Amato, Antonia Bernardo, Maria Sarah Bussi, Walter Giacomo Caturano, Chiara Cerbone, Anna D’Avino, Fabio Dell’Aversana, Andrea De Petris, Federica Esposito, Rosanna Fattibene, Giulia Fontanella, Federica Iovino, Tiziana Masone, Noemi Mazzaracchio, Giulia Musella, Edda Napolitano, Francesca Niola , Raffaele Pignataro, Salvatore Prisco, Gaia Tessitore, Michela Tuozzo, Francesca Niola, Michela Tuozzo, and Tessitore, Gaia
- Published
- 2020
25. Simulation of linear turbulences adding an equilibrium electric field with poloidal profile
- Author
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Wuilloud, Gaëtan, Ricci, Paolo, and Avino, Fabio
- Subjects
CRPP_EDGE_TP4
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