A5037813601- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Fusion materials and technologies
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Atomic and Molecular Physics
- Bluetooth and Wireless Communication Technologies
- Cryptographic Implementations and Security
- Electrostatic Discharge in Electronics
- BIM and Construction Integration
- Antenna Design and Analysis
- Electromagnetic Compatibility and Measurements
National Agency for New Technologies, Energy and Sustainable Economic Development
2018-2023
University of Padua
2018-2023
Institute for the Science and Technology of Plasmas
2023
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....
An improvement for the vacuum system of multidriver radio frequency (RF) prototype negative ion source SPIDER has been developed, to allow operating at high RF power, while minimizing breakdown probability on outside plasma source. A first-of-its-kind large nonevaporable getter (NEG) pump, based a modular design 384 cartridges totaling about 350 kg ZAO® alloy (composed by Zr-Ti-V-Al) with an installed pumping speed room temperature 330 m3/s hydrogen, will complement existing system, eight...
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...
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.
The cesium ovens for the prototype source of ITER neutral beam injectors are currently tested in CAesium Test Stand (CATS) facility, with a background pressure 10-6 mbar. Different diagnostics here installed: two Langmuir-Taylor detectors allow us to determine Cs vapour evaporation rate from oven and density at different positions vacuum chamber; laser absorption spectroscopy is used measure integrated over line sight quartz crystal microbalance detect mass deposited time surface. In this...
This contribution describes the commissioning and first operation of a fixed triple Langmuir probe in source for production ions deuterium extracted from radio frequency plasma (SPIDER), full-scale prototype negative-ion ITER neutral beam injectors. diagnostic is capable measuring time evolution main features entire duration discharge, allowing to correlate local properties, such as density, electron temperature, potential, control parameters, i.e., filter field intensity, (RF) power, bias...
Understanding the distribution of caesium by plasma within expansion region SPIDER beam source is essential to maximise efficiency negative ion surface-production. The redistributed diffusion and greatly affected plasma-wall interactions with molybdenum walls. This work considers processes which make up wall interaction transmission generated particles across sheath. An analytic model set-up for each four main that occur at wall: thermal desorption (evaporation), physical (sputtering),...
Abstract Three years of experiments on SPIDER allowed characterization the main features source plasma and negative ion beam, in original design configuration. For large dimensions chamber, extraction area, investigation single-beamlet currents uniformity had to be carried out extend knowledge gained smaller prototype sources. The configuration multiple RF drivers filter field topologies were found cause a peculiar behavior confinement drivers, creating left-right asymmetries which also...
The use of caesium vapour is mandatory in plasma sources for negative ion beams to achieve a sufficient density. In the SPIDER source, three ovens will provide sufficiently high flux walls but also relatively even distribution source. order ensure are operating properly terms repeatability evaporated flow, and characterize emitted from its nozzles, CAesium Test Stand (CATS) was equipped with set diagnostics. This paper reports present configuration diagnostic set-up. Surface ionization...
SPIDER is the 100 keV full-size Negative Ion Source prototype of ITER Neutral Beam Injector, operating at Consorzio RFX in Padova, Italy. The largest world, generates an RF driven plasma from which Deuterium or Hydrogen negative ions are produced and extracted. At end 2021, a scheduled long-term shutdown started to introduce major modifications improvements aiming solve issues drawbacks identified during first three years operations. action period was disassembly characterization beam source...
Abstract The experimental fusion reactor ITER will feature two (or three) heating neutral beam injectors (NBI) capable of delivering 33(or 50) MW power into the plasma. A NBI consists a plasma source for production negative ions (extracted ion current up to 329 A/m 2 in H and 285 D) then accelerated 1 MeV one hour. is neutralized, residual are electrostatically removed before injection. beamline was designed divergence between 3 7 mrad. NBIs relies on RF-driven, Inductively-Coupled Plasmas...