M. Spolaore
A5030810252- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Particle accelerators and beam dynamics
- Plasma Diagnostics and Applications
- Fusion materials and technologies
- Superconducting Materials and Applications
- Laser-Plasma Interactions and Diagnostics
- Solar and Space Plasma Dynamics
- Metal and Thin Film Mechanics
- Fluid Dynamics and Turbulent Flows
- Particle Accelerators and Free-Electron Lasers
- Electrohydrodynamics and Fluid Dynamics
- Geomagnetism and Paleomagnetism Studies
- Nuclear reactor physics and engineering
- Dust and Plasma Wave Phenomena
- Physics of Superconductivity and Magnetism
- Laser-induced spectroscopy and plasma
- Quantum chaos and dynamical systems
- Diamond and Carbon-based Materials Research
- Magnetic Field Sensors Techniques
- Magnetic Properties and Applications
- Advancements in Semiconductor Devices and Circuit Design
- Plasma Applications and Diagnostics
- Atomic and Subatomic Physics Research
- Gas Dynamics and Kinetic Theory
National Agency for New Technologies, Energy and Sustainable Economic Development
2015-2024
University of Padua
2015-2024
Max Planck Institute for Plasma Physics
2024
Institute for the Science and Technology of Plasmas
2020-2023
École Polytechnique Fédérale de Lausanne
2021
University of California, San Diego
2021
National Centre for Nuclear Research
2021
Institute of Ionized Gas
1997-2014
University of Trento
2014
University of Milan
2013
The ITER Neutral Beam Test Facility (NBTF), called PRIMA (Padova Research on Megavolt Accelerator), is hosted in Padova, Italy and includes two experiments: MITICA, the full-scale prototype of heating neutral beam injector, SPIDER, full-size radio frequency negative-ions source. NBTF realization exploitation SPIDER MITICA have been recognized as necessary to make future operation injectors efficient reliable, fundamental achievement thermonuclear-relevant plasma parameters ITER. This paper...
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...
A detailed cross-device investigation on the role of filamentary dynamics in high-density regimes has been performed within EUROfusion framework, comparing ASDEX Upgrade (AUG) and TCV tokamaks. Both devices run density ramp experiments at different levels plasma current, keeping toroidal field or q95 constant order to disentangle parallel connection length current. During scan a field, both scrape-off layer (SOL) profiles tend develop clear SOL shoulder lower edge whenever current is...
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...
The ITER heating neutral beam (HNB) injector, based on negative ions accelerated at 1 MV, will be tested and optimized in the SPIDER source MITICA full injector prototypes, using a set of diagnostics not available HNB. RF source, where H−/D− production is enhanced by cesium evaporation, monitored with thermocouples, electrostatic probes, optical emission spectroscopy, cavity ring down, laser absorption spectroscopy. analyzed cooling water calorimetry, short pulse instrumented calorimeter,...
SPIDER is one of the two projects ITER Neutral Beam Test Facility (NBTF) under construction in Padova, Italy, at Consorzio RFX premises; it will have a 100 keV beam source with full-size prototype radiofrequency (RF) ion for Injector (NBI), designed to operate pulse length up 3600 s, featuring ITER-like filter field configuration, caesium oven layout and wide set diagnostics.These features allow reproducing operation like as cannot be done any other existing test facility.SPIDER realization...
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...
Giant negative ion sources for neutral beam injectors deliver huge currents, thanks to their multi-beamlet configuration. As the single-beamlet optics defines transmission losses along beamline, extraction of a similar current all beamlets is extremely desirable, in order facilitate source operation (i.e., around perveance match). This Review investigates correlation between vertical profile intensity and profiles plasma properties at region source, focusing on influence increasing cesium...
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....
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...
Neutral beam injection is one of the most important methods plasma heating in thermonuclear fusion experiments, allowing attainment conditions as well driving current. beams are generally produced by electrostatically accelerating ions, which neutralised before into magnetised plasma. At particle energy required for advanced devices and particularly ITER, neutralisation positive ions very inefficient so that negative used. The present paper devoted to description phenomena occurring when a...
A set of Ohmic density ramp experiments addressing the role parallel connection length in modifying scrape off layer (SOL) properties has been performed on TCV tokamak. The modified by varying poloidal flux expansion fx. It will be shown that this modification does not influence neither detachment threshold, nor development a flat SOL profile which instead depends strongly increase core line average density. upstream profile, with appearance what is generally called shoulder, related to...
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...
Recently, a European transport project has been carried out among several fusion devices for studying the possible link between mean radial electric field ( E r ), long-range correlation (LRC) and edge bifurcations in plasmas. The main results reported this paper include: (i) discovery of low-frequency LRCs potential fluctuations which are amplified during development using electrode biasing spontaneous sheared flows stellarators tokamaks. Evidence nonlocal energy transfer geodesic acoustic...