A. Pimazzoni
A5025832446- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Particle Accelerators and Free-Electron Lasers
- Fusion materials and technologies
- Laser-Plasma Interactions and Diagnostics
- Superconducting Materials and Applications
- Atomic and Molecular Physics
- Electrostatic Discharge in Electronics
- Mass Spectrometry Techniques and Applications
- Gyrotron and Vacuum Electronics Research
- Plasma Applications and Diagnostics
- Scientific Measurement and Uncertainty Evaluation
- Hydrology and Sediment Transport Processes
- Hydrology and Watershed Management Studies
- Electrohydrodynamics and Fluid Dynamics
- Silicon Carbide Semiconductor Technologies
- Laser-induced spectroscopy and plasma
- Radiation Effects in Electronics
- Advanced Sensor Technologies Research
- Ion-surface interactions and analysis
- Landslides and related hazards
- Ultrasonics and Acoustic Wave Propagation
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro
2017-2023
National Agency for New Technologies, Energy and Sustainable Economic Development
2016-2023
University of Padua
2015-2023
Consorzio Venezia Ricerche
2023
National Institutes for Quantum Science and Technology
2017
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...
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...
The European DEMO is a pulsed device with pulse length of 2 hours. functions devoted to the heating and current drive system are: plasma breakdown, ramp-up flat-top where fusion reactions occur, control during phase, finally ramp-down. EU-DEMO project was in Pre-Concept Design Phase 2014-2020, meaning that some cases, design values precise requirements from physics point view were not yet frozen. A total 130 MW considered for all phases plasma: flat top, 30 required neoclassical tearing...
In dolomitic headwater catchments, intense rainstorms of short duration produce runoff discharges that often trigger debris flows on the scree slopes at base rock cliffs. order to measure these discharges, we placed a measuring facility outlet (elevation 1770 m a.s.l.) small, rocky catchment (area ∼0.032 km2, average slope ∼320%) located in Venetian Dolomites (North Eastern Italian Alps). The consists an approximately rectangular basin, ending with sharp-crested weir. Six events were...
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...
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...
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....
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...
The ITER project requires additional heating provided by two neutral beam injectors using 40 A negative deuterium ions accelerated at 1 MV. As the requirements have never been experimentally met, a test facility is under construction Consorzio RFX, which hosts experiments: SPIDER, full-size 100 kV ion source prototype, and MITICA, MeV injector prototype. Since diagnostics in will be mainly limited to thermocouples, due neutron gamma radiation access, it crucial thoroughly investigate...
Abstract Neutral beam injectors are among the most important methods of plasma heating in magnetic confinement fusion devices. The propagation negative ions, prior to their conversion into neutrals, is fundamental importance determining properties beam, such as its aiming and focusing at long-distances, so deposit power proper position inside confined plasma, well avoid interaction with material surfaces along path. final design ITER Heating Beam prototype has been completed Consorzio RFX...
The full-size ITER ion source prototype SPIDER (Source for the Production of Ions Deuterium Extracted from a Radio frequency plasma) has recently started beam operation, whose objective is to produce 100 keV, 60 A hydrogen negative ions 1 h. presently operated in volume regime, and power consequently limited. In such configuration, high resolution calorimeter STRIKE (Short-Time Retractable Instrumented Kalorimeter Experiment), even though uncooled, may be used instead dump without limiting...
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...
Source for the production of ions deuterium extracted from a radio frequency plasma (SPIDER) is full-scale prototype ITER heating neutral beam (HNB) source. Beam operation in SPIDER, with eventual aim achieving 100-keV, 46-A hydrogen negative ion 1 h, has mainly been performed volume without cesium. Recently, introduction cesium, SPIDER moved to surface operational regime, noted increase current. Electrical and calorimetric measurements current have previously shown discrepancies between...