Fabrizio Marignetti
A5061095644- Electric Motor Design and Analysis
- Magnetic Bearings and Levitation Dynamics
- Magnetic Properties and Applications
- Particle physics theoretical and experimental studies
- Sensorless Control of Electric Motors
- Dark Matter and Cosmic Phenomena
- Multilevel Inverters and Converters
- Induction Heating and Inverter Technology
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Microgrid Control and Optimization
- Radiation Detection and Scintillator Technologies
- Real-time simulation and control systems
- Advanced DC-DC Converters
- Superconducting Materials and Applications
- Wave and Wind Energy Systems
- Wind Turbine Control Systems
- Neutrino Physics Research
- Electric and Hybrid Vehicle Technologies
- Cosmology and Gravitation Theories
- Advanced Battery Technologies Research
- Fluid Dynamics and Vibration Analysis
- Physics of Superconductivity and Magnetism
- Electromagnetic Simulation and Numerical Methods
- Non-Destructive Testing Techniques
Università degli studi di Cassino e del Lazio Meridionale
2015-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2015-2024
University of Zurich
2023
Xenon Pharmaceuticals (Canada)
2023
National Institute of Optics
2016-2018
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
2017-2018
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
2018
University of California, Berkeley
2018
Istanbul University
2018
Engineering (Italy)
2018
We report results from searches for new physics with low-energy electronic recoil data recorded the XENON1T detector. With an exposure of 0.65 tonne-years and unprecedentedly low background rate 76±2stat events/(tonne×year×keV) between 1 30 keV, enable one most sensitive solar axions, enhanced neutrino magnetic moment using neutrinos, bosonic dark matter. An excess over known backgrounds is observed at energies prominent 2 3 keV. The axion model has a 3.4σ significance, three-dimensional 90%...
We report constraints on light dark matter (DM) models using ionization signals in the XENON1T experiment. mitigate backgrounds with strong event selections, rather than requiring a scintillation signal, leaving an effective exposure of (22±3) tonne day. Above ∼0.4 keV_{ee}, we observe <1 event/(tonne day keV_{ee}), which is more 1000 times lower similar searches other detectors. Despite observing higher rate at energies, no DM or CEvNS detection may be claimed because cannot model all our...
XENONnT is a dark matter direct detection experiment, utilizing 5.9 t of instrumented liquid xenon, located at the INFN Laboratori Nazionali del Gran Sasso. In this work, we predict experimental background and project sensitivity to weakly interacting massive particles (WIMPs). The expected average differential rate in energy region interest, corresponding (1, 13) keV (4, 50) for electronic nuclear recoils, amounts $12.3 \pm 0.6$ (keV y)$^{-1}$ $(2.2\pm 0.5)\times 10^{-3}$ y)$^{-1}$,...
We report the first experimental results on spin-dependent elastic weakly interacting massive particle (WIMP) nucleon scattering from XENON1T dark matter search experiment. The analysis uses full ton year exposure of to constrain proton-only and neutron-only cases. No significant signal excess is observed, a profile likelihood ratio used set exclusion limits WIMP-nucleon interactions. This includes most stringent constraint date WIMP-neutron cross section, with minimum 6.3×10^{-42} cm^{2} at...
Direct dark matter detection experiments based on a liquid xenon target are leading the search for particles with masses above $\sim$ 5 GeV/c$^2$, but have limited sensitivity to lighter because of small momentum transfer in matter-nucleus elastic scattering. However, there is an irreducible contribution from inelastic processes accompanying scattering, which leads excitation and ionization recoiling atom (the Migdal effect) or emission Bremsstrahlung photon. In this letter, we report probe...
We report on a blinded analysis of low-energy electronic-recoil data from the first science run XENONnT dark matter experiment. Novel subsystems and increased 5.9 tonne liquid xenon target reduced background in (1, 30) keV search region to $(15.8 \pm 1.3)$ events/(tonne$\times$year$\times$keV), lowest ever achieved detector $\sim$5 times lower than XENON1T. With an exposure 1.16 tonne-years, we observe no excess above set stringent new limits solar axions, enhanced neutrino magnetic moment,...
Delayed single- and few-electron emissions plague dual-phase time projection chambers, limiting their potential to search for light-mass dark matter. This paper examines the origins of these events in XENON1T experiment. Characterization intensity delayed electron backgrounds shows that resulting are correlated, position, with high-energy can effectively be vetoed. In this work we extend previous S2-only analyses down a single electron. From analysis, after removing correlated backgrounds,...
We present the first measurement of nuclear recoils from solar <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mmultiscripts><a:mrow><a:mi mathvariant="normal">B</a:mi></a:mrow><a:mprescripts/><a:none/><a:mrow><a:mn>8</a:mn></a:mrow></a:mmultiscripts></a:mrow></a:math> neutrinos via coherent elastic neutrino-nucleus scattering with XENONnT dark matter experiment. The central detector is a low-background, two-phase time projection chamber 5.9 t sensitive...
This paper investigates the thermal behavior of axial flux synchronous permanent-magnet machines (AFSPMMs) through a 3-D thermal-magnetic finite-element analysis (FEA). offers systematic approach to magnetothermal FEA. The considered machine is wound on soft magnetic compound core. computation field performed via coupled and fluid-dynamical model based FEA, where sources are obtained from DC current flow magnetostatic model. includes an overview method (FEM) implementation. Simulation...
We report on a search for nuclear recoil signals from solar $^8$B neutrinos elastically scattering off xenon nuclei in XENON1T data, lowering the energy threshold 2.6 keV to 1.6 keV. develop variety of novel techniques limit resulting increase backgrounds near threshold. No significant neutrino-like excess is found an exposure 0.6 t $\times$ y. For first time, we use non-detection constrain light yield 1-2 recoils liquid xenon, as well non-standard neutrino-quark interactions. Finally,...
The XENON1T experiment searches for dark matter particles through their scattering off xenon atoms in a 2 tonne liquid target. detector is dual-phase time projection chamber, which measures simultaneously the scintillation and ionization signals produced by interactions target volume, to reconstruct energy position, as well type of interaction. background rate central volume lowest achieved so far with xenon-based direct detection experiment. In this work we describe response model detector,...
Axial-flux permanent magnet (PM) synchronous machines are suitable for direct drive applications. PM with fractional windings provide high power density, low torque ripple, and sinusoidal phase voltages, but suffer from rotor losses due to stator field harmonics slotting. This paper formulates an electromagnetic model based on the polar coordinate representation of air-gap magnetic field. No-load load tests carried out a soft-magnetic-composite axial-flux machine validate model. Rotor...
This paper investigates a novel online method for static eccentricity (SE) fault detection of single-stator-single-rotor axial flux permanent-magnet (AFPM) machines. The allows both estimating the SE factor and computing minimum air-gap position. As direct measurements are expensive, proposed is based on measurement voltages three search coils uniformly distributed in air gap. Unlike current spectrum-based methods which winding configuration has considerable impact, can be used any type AFPM...
The XENON1T experiment at the Laboratori Nazionali del Gran Sasso is most sensitive direct detection for dark matter in form of weakly interacting particles (WIMPs) with masses above $6\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ scattering off nuclei. detector employs a dual-phase time projection chamber 2.0 metric tons liquid xenon target. A one $\text{metric}\text{ }\text{ton}\ifmmode\times\else\texttimes\fi{}\mathrm{year}$ exposure science data was collected between October 2016 and February...
Abstract Xenon dual-phase time projection chambers designed to search for weakly interacting massive particles have so far shown a relative energy resolution which degrades with above $$\sim $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>∼</mml:mo></mml:math> 200 keV due the saturation effects. This has limited their sensitivity in rare events like neutrinoless double-beta decay of $$^{136} \hbox {Xe}$$...
The selection of low-radioactive construction materials is the utmost importance for rare-event searches and thus critical to XENONnT experiment. Results an extensive radioassay program are reported, in which material samples have been screened with gamma-ray spectroscopy, mass spectrometry, 222 Rn emanation measurements. Furthermore, cleanliness procedures applied remove or mitigate surface contamination detector described. Screening results, used as inputs a Monte Carlo simulation, predict...
This paper illustrates the operation of a tubular-machine drive as linear generator for heave-buoy wave energy conversion. Linear generators, which are adopted in marine power plants, offer advantage generating without introducing any conversion crank gear or hydraulic system. The use topology allows electromagnetic thrust density to be improved. briefly summarizes principles buoy interaction and reports design analysis control permanent-magnet (PM) synchronous tubular machine based on...
This paper presents a multiphysics modeling through finite-element (FE) coupled electromagnetic and thermal field analysis of permanent-magnet tubular linear motor (PMTLM). Two-dimensional axial-symmetric FE steady-state transient solutions are first obtained for the magnetic-flux-density distribution, cogging force, thrust, losses PMTLM prototype. The magnetic results then used 3-D simulation to get temperature distribution. proves that numerical is viable tool design performance...
This paper studies the effects of static eccentricity on axial flux permanent-magnet machines (AFPMMs) using three-dimensional finite-element analysis (3-D FEA). Use numerical modeling makes it possible to precisely study in these types machines. The accuracy FEM model is validated experimental measurement. To best awareness authors, AFPMMs have not been studied before. Hence, a new definition for factor (SEF) presented and shown that occurrence very high A motor with different degrees rotor...
This work deals with a 10-MW doubly fed induction generator (DFIG) for direct-drive operation of wind turbines reduced-size converter. The includes lumped parameter design, an optimization procedure, finite-element analysis (FEA), and electrical performance assessment. A monetary cost was assumed as function, approximation the construction function axial length obtained. found solutions were checked by FEA in order to assure mechanical feasibility. Further verifications developed allow...
Marine energy represents a very promising source of available worldwide. Although this is in several forms, wave the more widespread characterized by high power density. In order to exploit from waves, numerous systems have been designed and commercialized. The Inertial Sea Wave Energy Converter device based on floating body slack-moored seabed, using gyroscope as reference frame produce electric power. This paper describes design proposed converter equipped with two linear tubular...
This paper reports proof-of-principle of an optical fiber Bragg grating (FBG) operating as electric field sensor. The system is based on a semiconductor diode laser, emitting around 1577.5 nm that interrogates the sensor its maximum reflectivity point. application strong causes small variation path length waveguide due to electrostriction and thus perturbs peak wavelength. Calibration dynamic range tests are performed using parallel-plate capacitor create variable (1–100 kV/cm). A great...
We present results on the search for double-electron capture ($2\nu\text{ECEC}$) of $^{124}$Xe and neutrinoless double-$\beta$ decay ($0\nu\beta\beta$) $^{136}$Xe in XENON1T. consider captures from K- up to N-shell $2\nu\text{ECEC}$ signal model measure a total half-life $T_{1/2}^{2\nu\text{ECEC}}=(1.1\pm0.2_\text{stat}\pm0.1_\text{sys})\times 10^{22}\;\text{yr}$ with $0.87\;\text{kg}\times\text{yr}$ isotope exposure. The statistical significance is $7.0\,\sigma$. use XENON1T data...