A5023783672- Magnetic confinement fusion research
- Superconducting Materials and Applications
- Electromagnetic Simulation and Numerical Methods
- Non-Destructive Testing Techniques
- Electromagnetic Scattering and Analysis
- Particle accelerators and beam dynamics
- Fusion materials and technologies
- Magnetic Properties and Applications
- Electrical and Bioimpedance Tomography
- Ionosphere and magnetosphere dynamics
- Advanced Numerical Methods in Computational Mathematics
- Numerical methods in engineering
- Geophysical and Geoelectrical Methods
- Ultrasonics and Acoustic Wave Propagation
- Plasma Diagnostics and Applications
- Geophysical Methods and Applications
- Numerical methods in inverse problems
- Plasmonic and Surface Plasmon Research
- Laser-Plasma Interactions and Diagnostics
- Advanced Antenna and Metasurface Technologies
- Magnetic Field Sensors Techniques
- Welding Techniques and Residual Stresses
- Physics of Superconductivity and Magnetism
- Microwave Imaging and Scattering Analysis
- Electromagnetic Launch and Propulsion Technology
University of Naples Federico II
2015-2025
Università degli studi di Cassino e del Lazio Meridionale
1999-2025
Ingegneria dei Trasporti (Italy)
1990-2024
Consorzio CREO (Italy)
2007-2024
Culham Science Centre
2024
Culham Centre for Fusion Energy
2024
Center for Research and Telecommunication Experimentation for Networked Communities
2023
Royal Military Academy
2020
National Agency for New Technologies, Energy and Sustainable Economic Development
2002-2015
UniNettuno University
2010
An integral formulation for eddy-current problems in nomagnetic structures is presented. The solenoidality of the current density assured by introducing a vector potential T. This possesses only two scalar components, as gauge chosen to ensure its uniqueness u = 0, where prescribed field. discrete analogue this and boundary conditions are directly imposed shape functions, exploiting use edge finite elements methods network theory. In frame methods, approach seems most adequate analyse eddy...
In this paper, the inverse problem of resistivity retrieval is addressed in frame electrical resistance tomography (ERT). The ERT data a set measurements dc resistances between pairs electrodes contact with conductor under investigation. This paper focused on non-iterative inversion method based monotonicity matrix (and its numerical approximations). main features proposed are low computational cost requiring solution O(n) direct problems, where n number parameters used to represent unknown...
Abstract In this paper the magnetostatic problem is stated in terms of two‐component electric and magnetic vector potentials. An associated numerical method, based on adoption edge elements, proposed. This procedure overcomes cancellation problems complexity interface conditions encountered by similar approaches presence inhomogeneities discontinuities currents fields.
A differential T, Omega formulation using nonconformal elements is presented. It an extension of the T integral formulation. The method has been used as basis a finite-element code that handles open boundary problem eddy-current analysis in fully 3-D conductors. results obtained with this for different treatments conditions at infinity are shown and compared among themselves respect to efficiencies terms storage occupation, CPU time, accuracy.< <ETX...
An integral formulation for eddy-current problems in nomagnetic structures is presented. The solenoidality of the current density assured by introducing a vector potential T. This possesses only two scalar components, as gauge chosen to ensure its uniqueness u = 0, where prescribed field. discrete analogue this and boundary conditions are directly imposed shape functions, exploiting use edge finite elements methods network theory. In frame methods, approach seems most adequate analyse eddy...
A critical survey on some of the principal approaches to solution general three-dimensional eddy-current problem is presented. The two main families formulations, those magnetic and electric, are discussed, with reference both mathematical computational aspects. Particular attention paid vector potential formulations in view uniqueness, gauge interface problems.
A linearized non-rigid MHD consistent displacement model is shown to be adequate the study of vertical stability a plasma in an air core or iron tokamak. This simple but accurate approach, which can extended shape and radial position control, used determining limits validity linear approximation simulating behaviour detection system based on set flux measurements. The method provides basis for optimization measurements feedback parameters. features are illustrated, with reference NET...
In this Letter, the linear stability of resistive wall modes (RWMs) in toroidal geometry for a reversed field pinch (RFP) plasma is studied. Three computational models are used: cylindrical code ETAW, MHD MARS-F, and CarMa code, able to take fully into account effects three-dimensional conducting structure which mimics real shell experimental device. The computed mode growth rates generally agree with data. features shell, like gaps, allow novel interpretation RWM spectrum RFP's remove its...
Two issues of the resistive wall mode (RWM) control code maturity are addressed: inclusion advanced damping physics beyond ideal MHD description, and possibility taking into account influence 3D features conducting structures on stability control. Examples formulations computational results given, using MARS-F/K codes CarMa code. The MARS-K calculations for a DIII-D plasma shows that fast ion contributions, which can give additional drift kinetic stabilization in perturbative approach, also...
In this paper, a coupling strategy based on the control surface concept is used to self-consistently couple linear MHD solvers 3D codes for eddy current computation of currents in metallic structures surrounding plasma. The performed by assuming that plasma inertia (and, with it, all Alfven wave-like phenomena) can be neglected time scale interest, which dictated relevant electromagnetic structures. As shown, results perturbations inductance matrix operator. particular, adopting Fourier...
A novel numerical approach to calculate the time evolution of three dimensional distribution magnetic field and forces in end winding regions large turbine generators is presented. The proposed based on an integral formulation for nonlinear magnetostatic problems. Its main advantage reduction discretization only conductors materials. In this paper solution a coupled magnetostructural problem consisting calculation mechanical stresses deformations caused by electrodynamic analysis stepping...
Asymmetrical disruptions may occur during ITER operation and they be accompanied by large sideways forces rotation of the asymmetry. This is particular concern because resonance rotating asymmetry with natural frequencies vacuum vessel (and other in-vessel components) could lead to dynamic amplification forces. A significant fraction non-mitigated JET have toroidally asymmetric currents that flow partially inside plasma surrounding ('wall'). The toroidal asymmetries (otherwise known as...
Self-consistent computations are carried out to study the stability of resistive wall mode (RWM) in DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] plasmas with slow plasma rotation, using hybrid kinetic-magnetohydrodynamic code MARS-K [Y. Q. Liu et al., Phys. Plasmas 15, 112503 (2008)]. Based on kinetic resonances between and thermal particle toroidal precession drifts, self-consistent modeling predicts less stabilization compared perturbative approaches, experiments. A simple analytic...
With the exploration of MA plasma current regime in up to 0.5 s long discharges, RFX-mod has opened new and very promising perspectives for reversed field pinch (RFP) magnetic configuration, made significant progress understanding improving confinement controlling stability. A big leap with respect previous knowledge expectations on RFP physics performance been by since last 2006 IAEA Fusion Energy Conference. self-organized helical equilibrium experimentally achieved (the Single Helical...
In this paper, we address the imaging of spatial distribution resistivity conductive materials by using data from eddy-current nondestructive testing. Specifically, consists measurements impedance matrix at several frequencies acquired a coil array. The method processes second-order term (estimated measured data) power series expansion, with respect to frequency, matrix. This accounts for resistive contribution changes matrix, due presence anomalies in conductor under test, occurring...
This paper focuses on the coupling procedure between a 3-D integral formulation of eddy currents problem and linearized MHD model solved with differential approach. The final aim is to develop computational tool able analyze resistive wall modes fusion plasmas, including effects nonaxisymmetric conducting structures surrounding plasma.
In this paper we analyse the effects of three-dimensional ITER conducting structures on resistive wall modes (RWMs) growth rates. particular, a highly detailed description thick blanket modules (BMs) is given, with volumetric mesh including slits, holes, pockets and an anisotropic resistivity to take into account cooling channels. Also other important details vacuum vessel are included, such as outer triangular support, copper cladding, port extensions. To deal resulting huge computational...
Numerical formulations based on surface integral equations (SIEs) provide an accurate and efficient framework for the solution of electromagnetic scattering problem by three-dimensional plasmonic nanostructures in frequency domain. In this paper, we present a unified description SIE with both singular nonsingular kernel study their accuracy solving metallic nanoparticles spherical nonspherical shape. fact, numerical solution, especially near zone, is great importance analysis design...
The currents and forces induced in the tokamak vacuum vessel (wall) during disruption are calculated for different values of wall resistivity. Several consequences new developments derived from general result that global force acting on perfectly conducting must be exactly opposite to similar plasma, which is inherently small tokamaks. This theoretical prediction tested confirmed here ITER with modelled as fast thermal quench followed by slower current develops into vertical displacement...
This paper concerns fast electromagnetic modeling of volumetric cracks in conductive materials under eddy-current inspection. The underlying numerical method is described. model tested on aluminum structures employed aeronautical manufacture. computational results obtained with the display satisfactory agreement respective experimental and by representing as nonconductive surfaces.