A5018859720- Particle accelerators and beam dynamics
- Plasma Diagnostics and Applications
- Vacuum and Plasma Arcs
- Magnetic confinement fusion research
- Power Transformer Diagnostics and Insulation
- Lightning and Electromagnetic Phenomena
- High voltage insulation and dielectric phenomena
- Electrostatic Discharge in Electronics
- Silicon Carbide Semiconductor Technologies
- Electromagnetic Effects on Materials
- Particle Accelerators and Free-Electron Lasers
- Electrohydrodynamics and Fluid Dynamics
- Particle Detector Development and Performance
- Zeolite Catalysis and Synthesis
- Dielectric materials and actuators
- Hydrogen embrittlement and corrosion behaviors in metals
- solar cell performance optimization
- Energy Harvesting in Wireless Networks
- Catalysis and Hydrodesulfurization Studies
- Semiconductor Quantum Structures and Devices
- Microstructure and Mechanical Properties of Steels
- Thermal Analysis in Power Transmission
- Polymer Nanocomposites and Properties
- Plasma Applications and Diagnostics
- Innovative Energy Harvesting Technologies
University of Padua
2011-2024
Institute for the Science and Technology of Plasmas
2022
Universidade Federal do Rio Grande do Sul
2004
Since the late 1950s, an effect of electrical current in addition to joule heating on deformation metals called Electroplastic Effect (EPE) has been known. It is used nowadays so-called Electrically Assisted Forming (EAF) processes, but understanding phenomenon not very clear yet. found that EPE increases formability high stacking fault energy (SFE) materials, while low SFE materials reach fracture prematurely. Duplex Stainless Steels (DSSs) possess a microstructure consisting two phases...
Two nanomicas of similar composition, containing muscovite and quartz, but with different particle size distributions, have been used to prepare transparent epoxy nanocomposites. Their homogeneous dispersion, due the nano-size, was achieved even without being organically modified, no aggregation nanoparticles observed, thus maximizing specific interface between matrix nanofiller. No exfoliation or intercalation has observed by XRD, despite significant dispersion filler in which produced...
Study of High DC Voltage breakdown between stainless steel electrodes separated
A comparative evaluation is reported of the performance different discharge regimes—AC powered dielectric barrier (DBD) and DC corona positive (DC+) negative (DC−) polarity—implemented within same reactor, a benchtop prototype for an advanced oxidation stage in water treatment. For all three modes operation, DBD, DC+ DC−, reactor was tested using phenol as model pollutant determining process energy efficiency (kE G50), kinetics (t1/2), nitrated byproducts extent mineralization to CO2....
The modeling, simulation, and dynamic optimization of an industrial reaction system for acetylene hydrogenation are discussed in the present work. process consists three adiabatic fixed-bed reactors, series, with interstage cooling. These reactors located after compression caustic scrubbing sections ethylene plant, characterizing a front-end system; contrast to tail-end where placed de-ethanizer unit. conversion selectivity profiles optimized, taking into account catalyst deactivation...
Experiments carried out to describe the corona occurring in wire-cylinder geometries due short voltage pulses of positive polarity, and assess influence current on energy associated with each pulse both electrode geometry waveshape are reported. The experimental setup is described. data presented, functions that fit them adequately given. Within range tested values, it was found diameter wire did not exhibit any significant influence. cylinder appears very remarkable, but if one considers...
The High Voltage Padova Test Facility is an experimental device realized to investigate the high voltage insulation in vacuum support of negative neutral beam injector prototype for ITER, MITICA. Moreover, experiment aims give a contribution on understanding holding vacuum, as physical phenomenon. Two stainless steel electrodes, with few cm gap chamber, achieve saturation breakdown value (up 400 kV) after about ten hours. A highly time resolved X-ray diagnostic has been recently installed...
Counterintuitive experimental evidences have been observed during High Voltage Direct Current (HVDC) tests of two concave, axial-symmetric, electrodes insulated by large vacuum gaps 3 and 7 cm with voltages from 150 to 370 kVdc. The dissipation microdischarge power the conditioning procedure occurs mostly on anodic side in a region close axis system where electric field is at minimum, far positions breakdowns observed. analyses phenomena are carried out comparing temporal evolution voltages,...
The high voltage Padova test facility (HVPTF) is an experimental device for the study of HV insulation in vacuum, support realization prototype a neutral beam injector International Thermonuclear Experimental Reactor (ITER), named megavolt ITER and concept advancement (MITICA). investigates physical phenomena underlying holding particular mechanisms causing breakdowns electrode conditioning process. At HVPTF, inside vacuum chamber, two stainless steel electrodes, separated by few centimeters...
A high voltage generator built by a series connection of 100 kV modules was produced. The feasibility is ensured the inherent floating character each module which wireless powered efficiency photovoltaic cells illuminated laser system. Each equipped with control and monitoring board allowing excellent stabilization output. performance system in terms reliability, stability, evaluated. In particular using three setup, we achieved maximum 234 stability better than 0.1%.
This work compares two different procedures for the application of Lightning Impulse Voltage Waveform (LIVW) with 1.2/50 μs front/half value times: Up & Down (UD) and Always Breakdown (AwBD) to obtain cumulative breakdown voltage distribution Vacuum Interrupters (VIs).The pulses were applied several VIs medium applications fixed shield gap lengths ranging from 4mm 15mm. The repeatability results a given procedure, as well discrepancies, investigated compared.The AwBD where peak each pulse is...
The numerical integration of the current pulse delivered from a PD calibrator is easiest way to carry out performance test itself by using readily available experimental apparatus. paper discusses role and relative importance various influence quantities which intervene in measurement can contribute degrade uncertainty figure. It shown that type length connecting leads as well bandwidth scope have only second order influence, whereas correct estimate vertical sensitivity procedure used...
The article outlines the development of a diagnostic system designed to pinpoint origins X-ray emissions in high-voltage direct current (HVdc) equipment isolated by large vacuum gaps. Electrons extracted from cathodic surfaces through field emission (FE) processes are accelerated energies below 1 MeV, generating bremsstrahlung radiation upon impact with anodic surfaces. This constitutes one main evidence that conditioning is taking place on long gap and voltages above 50–100 kV. MITICA,...
IEC 60-2 with its new approach to the qualification of industrial measuring systems covers also case chopped LI (lightning impulses), time chopping down 500 ns. The paper discusses procedure for possible a reference system in terms parameters USR, sources error and their dependence on actual waveform: influence shape voltage collapse depending upon way which action is obtained discussed.
Abstract The development of MITICA, the prototype for a neutral beam injector ITER, drives interest in investigating high HV insulation vacuum. High Voltage Padova Test Facility (HVPTF) is an experimental device with aim studying fundamental processes leading to discharges, offering framework develop new diagnostics, models, and mode operations MITICA. For this purpose, HVPTF features vacuum chamber containing two electrodes which can achieve difference up 800 kV. X-ray bremsstrahlung...
This contribution describes the recent experimental results obtained at high voltage (HV) Padova test facility (HVPTF), laboratory able to carry out HV tests in vacuum up 800 kVdc/1mA with a holding time of several hours per session and aimed developing capability Megavolt ITer Injector & Concept Advance (MITICA) accelerator, prototype for International Thermonuclear Experimental Reactor (ITER) neutral beam injector (NBI). The experiments described this article refer double polarity...
This work describes the experimental activity and analyses carried out to investigate more in depth application of Voltage Holding Prediction Model (VHPM) predict Lightning Impulse (LIV) breakdown probability medium-voltage Vacuum Interrupters (VI). A new campaign on two different VI models produced by Siemens, with same rated voltage but structural features, has been at high laboratory Industrial Engineering Department Padua University systematic LIV pulses (up 345 kV) several samples...
Frequency and impulse responses of cast resin transformer windings are presented. The stress arising during lightning test is compared with that originated switching operations, in case oscillating transients.