A5014657319- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Particle Accelerators and Free-Electron Lasers
- Laser-induced spectroscopy and plasma
- Atomic and Molecular Physics
- Mass Spectrometry Techniques and Applications
- 3D Surveying and Cultural Heritage
- Optical measurement and interference techniques
- Fusion materials and technologies
- Gyrotron and Vacuum Electronics Research
- Optical Polarization and Ellipsometry
- Superconducting Materials and Applications
- Analytical chemistry methods development
- Conservation Techniques and Studies
- Electrostatic Discharge in Electronics
- Ultrasound in Clinical Applications
- Laser Design and Applications
- Magnetic Field Sensors Techniques
- Nuclear Physics and Applications
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Radiation Dose and Imaging
- Nuclear reactor physics and engineering
- Vacuum and Plasma Arcs
National Agency for New Technologies, Energy and Sustainable Economic Development
2007-2024
University of Padua
2015-2024
Fatebenefratelli Hospital
2011
Centro Universitário da Cidade
2009
CEA Grenoble
2004
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2004
Direction de la Recherche Technologique
2004
Abstract In ion sources of neutral beam injectors (NBIs) for fusion, multi-grid, multi-aperture accelerators are used. Accelerators typically optimized by numerical tools, usually taking the e-fold divergence as a valuable global indicator single beamlet optics. Nonetheless velocity distribution accelerated beamlets often deviates from ideal Gaussian profiles. Therefore an accurate characterization optics is essential, particularly negative within context developing ITER NBIs, which pose...
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...
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 This paper explores the operational boundaries and power availability of neutral beam injection (NBI) system in ITER, with a specific focus on shine-through loss prevention. Shine-through, phenomenon where part injected remains un-ionized plasma directly impacts first wall components, poses significant risk to lifetime ITER’s plasma-facing components. The window for NBI is consequently constrained by these losses, which are influenced factors such as density, energy, geometry....
The Source for the Production of Ions Deuterium Extracted from an RF plasma (SPIDER) experiment is full-size test-bed negative ion sources ITER neutral beams. It aims to extract and accelerate more than 350 A/ <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\text{m}^{2}$ </tex-math></inline-formula> hydrogen ions 1280 apertures, distributed over a surface approximately 2 . To assess uniformity, SPIDER...
Neutral beam injection (NBI) systems are required for heating and current drive in the next generation fusion experiment ITER, strict requirements placed on beamlet core divergence (&lt;7 mrad) transmission into tokamak. The measurement of single is challenging due to multi-beamlet nature negative ion sources that such systems; diagnostic compatible with large high power beams can only provide spatially averaged measurements, leading mixing signals within results. To improve...
In June 2018 the SPIDER device, which is full-size prototype of negative ion source and extractor for ITER Heating Neutral Beam has entered first operation phase at Test Facility (NBTF) in Padova, Italy. This paper describes present status experimental plans results obtained during campaign radio-frequency driven plasma source.
Abstract The SPIDER experiment, operated at the Neutral Beam Test Facility of Consorzio RFX, Padua, hosts prototype H − /D ion source for ITER neutral beam injectors. maximization current extracted from and minimization amount co-extracted electrons are among most relevant targets to accomplish. Cavity Ring-Down Spectroscopy diagnostic measures negative density in close plasma grid (the plasma-facing acceleration system), so identify operational parameters that maximize ions which can be...
Low divergence negative ion beams are crucial for the development of ITER-like fusion reactors. SPIDER is prototype beam source ITER heating neutral injector, and it recently started acceleration, up to a voltage 30 kV. The main diagnostics used measure beamlet movable diagnostic calorimeter (STRIKE), which gives thermal footprint beamlets; emission spectroscopy; visible imaging. These systems do not allow direct measurement single phase-space distribution, useful comparison with numerical...
This paper focuses on the growth of HfO2 by atomic layer deposition (ALD) at 350°C pseudomorphic Si1−xGex thin films (x=15% and 25%). Two different surface preparations (chemical oxidation HF “last” treatment) have been investigated to obtain highest film quality with thinnest interfacial possible. The initial stages ALD these surfaces (i.e., hafnium adsorption chlorine contamination) analyzed total x-ray fluorescence show that last treated are more convenient than chemically oxidized ones...
For the ITER fusion experiment, two neutral beam injectors are required for plasma heating and current drive. Each injector supplies a power of about 17 MW, obtained from neutralization 40 A (46 A), 1 MeV (0.87 MeV) negative deuterium (hydrogen) ions. The full is composed 1280 beamlets, formed in 16 beamlet groups, strict requirements apply to core divergence (&lt;7 mrad). test facility BATMAN Upgrade uses an ITER-like grid with one group, which consists 70 apertures. In joint campaign...
SPIDER is the full scale prototype for ITER Heating Neutral Beam (HNB) source. The production of negative ions in source mostly relies on conversion H/D atoms and positive a 1.6 m <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\times0.8$ </tex-math></inline-formula> converter surface, which covered with cesium order to reduce its work function maximize efficiency. In SPIDER, optical emission spectroscopy...
The compact radio frequency negative ion source NIO1 (Negative Ion Optimization phase 1) has been designed, built and operated by Consorzio RFX INFN-LNL in order to study optimize the production acceleration of H -ions continuous operation.In 2020 Cs was evaporated increase total extracted current.After an initial reduction electron ratio subsequently current, performances progressively worsened, because excessive amount source; increased from below 1 more than 10, while current density...