R. Cavazzana
A5018991388- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Plasma Diagnostics and Applications
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Solar and Space Plasma Dynamics
- Laser-Plasma Interactions and Diagnostics
- Fusion materials and technologies
- Electrohydrodynamics and Fluid Dynamics
- Plasma Applications and Diagnostics
- Magnetic Field Sensors Techniques
- Fluid Dynamics and Turbulent Flows
- Laser-induced spectroscopy and plasma
- Metal and Thin Film Mechanics
- Nuclear reactor physics and engineering
- Advanced Data Storage Technologies
- Dust and Plasma Wave Phenomena
- Nuclear Physics and Applications
- Geomagnetism and Paleomagnetism Studies
- Heme Oxygenase-1 and Carbon Monoxide
- Electromagnetic Simulation and Numerical Methods
- Geophysical Methods and Applications
- Complex Systems and Time Series Analysis
- Semiconductor materials and devices
- Gyrotron and Vacuum Electronics Research
National Agency for New Technologies, Energy and Sustainable Economic Development
2015-2024
University of Padua
2015-2024
University of Rome Tor Vergata
2024
Institute of Ionized Gas
1995-2024
Royal Military Academy
2020
Innova (Italy)
2019
Fraunhofer Institute for Interfacial Engineering and Biotechnology
2018
John Wiley & Sons (Germany)
2018
University of Bari Aldo Moro
2018
Polytechnique Montréal
2018
Background Low temperature plasmas have been proposed in medicine as agents for tissue disinfection and received increasing attention due to the frequency of bacterial resistance antibiotics. This study explored whether atmospheric-pressure cold plasma (APCP) generated by a new portable device that ionizes flow helium gas can inactivate ocular pathogens without causing significant damage. Methodology/Principal Findings We tested APCP effects on cultured Pseudomonas aeruginosa, Escherichia...
The objective of this study was to determine the efficacy and mechanisms inactivation two clinically relevant ESKAPE bacteria namely Pseudomonas aeruginosa methicillin-resistant Staphylococcus aureus by atmospheric pressure cold plasma.Plasma generated between brass grids applying a radiofrequency electric field flow helium. Intracellular generation reactive species, alterations in cell membrane, planktonic or biofilm growth were studied. Results compared with commonly used antimicrobial...
The plasma diagnostic and control (D&C) system for a future tokamak demonstration fusion reactor (DEMO) will have to provide reliable operation near technical physics limits, while its front-end components be subject strong adverse effects within the nuclear high temperature environment. ongoing developments ITER D&C represent an important starting point progressing towards DEMO. Requirements detailed exploration of are however pushing design using sophisticated methods aiming large spatial...
Abstract The negative-ion based neutral beam injector for heating and current drive of the ITER plasma (ITER HNB) is under development, at present focusing on optimization full-scale source in SPIDER test stand. production H − or D ions ion low work function surfaces obtained by caesium evaporation. This paper describes conditioning procedure corresponding performances during first operation with caesium. Technical solutions to overcome limitations stand are described. influence parameters...
Heating neutral beam (HNB) injectors, necessary to achieve burning conditions and control plasma instabilities in ITER, are characterized by such demanding parameters that a test facility (NBTF) dedicated their development optimization is being realized Padua (Italy) with direct contributions from the Italian government (through Consorzio RFX as host entity) ITER international organization (with kind domestic agencies of Europe, Japan India) technical scientific support various European...
The requirements of ITER neutral beam injectors (1 MeV, 40 A negative deuterium ion current for 1 h) have never been simultaneously attained; therefore, a dedicated Neutral Beam Test Facility (NBTF) was set up at Consorzio RFX (Padova, Italy). NBTF includes two experiments: SPIDER (Source the Production Ions Deuterium Extracted from Rf plasma), full-scale prototype source injectors, with 100 keV accelerator, to investigate and optimize properties source; MITICA, entire injector, devoted...
Stable operation with control on magnetohydrodynamic modes has been obtained in the modified reversed field experiment employing a set of 192 feedback controlled saddle coils. Improvements plasma temperature, confinement (twofold), and pulse length (threefold) and, as consequence magnetic fluctuation reduction, strong mitigation plasma-wall interaction mode locking are reported.Received 27 January 2006DOI:https://doi.org/10.1103/PhysRevLett.97.075001©2006 American Physical Society
The RFX-mod machine (Sonato et al 2003 Fusion Eng. Des. 66 161) recently achieved, for the first time in a reversed-field pinch, high plasma current up to 1.6 MA with good confinement. Magnetic feedback control of magnetohydrodynamic instabilities was essential reach goal. As is raised, spontaneously accesses new helical state, starting from turbulent multi-helical conditions. Together this raise, ratio between dominant and secondary mode amplitudes increases continuous way. This brings...
This paper presents turbulence investigations in the scrape-off layer (SOL) of ASDEX Upgrade ohmic, L-mode and H-mode discharges using electrostatic electromagnetic probes. Detailed studies are performed on small scale ELM filaments. Simultaneous measurements floating plasma potential fluctuations revealed significant differences between these quantities. Large errors can occur when electric field is extracted from measurements, even ohmic discharges. Turbulence plasmas show existence...
RFX-mod is a Reversed Field Pinch device that allowed performing experiments in regimes with plasma current up to 2 MA, thanks its MHD active control system. Experiments have shown improved performances are obtained when the resonant part of m = 1 spectrum one dominant tearing mode much higher than other secondary ones (quasi single helicity states). Tearing modes play crucial role determining energy and particle transport. Based on present understanding interplay between passive conductive...
An overview of the recent operations and main results cesium injection in Source for Production Ions Deuterium Extracted from Rf plasma (SPIDER) negative ion source are described this contribution. In experiments without injection, all SPIDER plants were tested to verify basic expectations on operational parameters (e.g., electron cooling effectiveness magnetic filter field) determine its region. For beam properties, it was shown that current density varies across vertical direction....
Three-dimensional turbulence simulations of a RFX-mod diverted plasma are performed in the presence biasing electrode. The show strong suppression turbulent transport caused by induced $\mathbf{E}\times\mathbf{B}$ flow shear, which leads to formation an edge barrier with pedestal-like structure, qualitative agreement experiments. shear voltage is also observed proximity density limit crossing, suggesting that may allow for larger maximum achievable values. By leveraging simulation results,...
Abstract Three-dimensional turbulence simulations of a RFX-mod diverted plasma are performed in the presence biasing electrode. The show strong suppression turbulent transport caused by induced E × B flow shear, which leads to formation an edge barrier with pedestal-like structure, qualitative agreement experiments. shear voltage is also observed proximity density limit crossing, suggesting that may allow for larger maximum achievable values. By leveraging simulation results, theoretical...
A source for the production of low-power plasmas at atmospheric pressure, to be used nondamaging sterilization living tissues, is presented. The source, powered by radiofrequency and working with a helium flow, has specific configuration, studied prevent formation electric arcs dangerous matter. It capable killing different types bacteria decimal reduction time 1–2 min; on contrary, human cells such as conjunctival fibroblasts were found almost unharmed plasma. high concentration OH...
Integrating the plasma core performance with an edge and scrape-off layer (SOL) that leads to tolerable heat particle loads on wall is a major challenge. The new European medium size tokamak task force (EU-MST) coordinates research ASDEX Upgrade (AUG), MAST TCV. This multi-machine approach within EU-MST, covering wide parameter range, instrumental progress in field, as ITER DEMO core/pedestal SOL parameters are not achievable simultaneously present day devices. A two prong adopted. On one...
The electrostatic turbulence in the edge plasma of RFX reversed field pinch experiment has been studied using Langmuir probes and a homodyne reflectometer. radial particle flux driven by fluctuations measured region where double $\mathbf{E}\ifmmode\times\else\texttimes\fi{}\mathbf{B}$ velocity shear layer occurs. It is found that almost 100% at fluctuations. naturally occurring shown to be close required Biglari-Diamond-Terry criterion for decorrelation.
Coherent structures identified in two reversed field pinch experiments are interpreted as a dynamic balance of dipolar and monopolar vortices growing evolving under the effect ExB flow shear. For first time their contribution to anomalous transport has been estimated fusion related plasmas, showing that they can account for up 50% total plasma diffusivity. The experimental findings indicate diffusion coefficient associated with coherent depends on relative population types is minimum when...
RFX-mod is a reversed field pinch (RFP) experiment equipped with system that actively controls the magnetic boundary. In this paper we describe results of new control algorithm, clean mode (CMC), in which aliasing sideband harmonics generated by discrete saddle coils corrected real time. CMC operation leads to smoother (i.e. more axisymmetric) Tearing modes rotate (up 100 Hz) and partially unlock. Plasma–wall interaction diminishes due decrease non-axisymmetric shift plasma column. With...
With the exploration of MA plasma current regime in up to 0.5 s long discharges, RFX-mod has opened new and very promising perspectives for reversed field pinch (RFP) magnetic configuration, made significant progress understanding improving confinement controlling stability. A big leap with respect previous knowledge expectations on RFP physics performance been by since last 2006 IAEA Fusion Energy Conference. self-organized helical equilibrium experimentally achieved (the Single Helical...